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  • Non-local effect of impurity states on the exchange coupling mechanism in magnetic topological insulators
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-11-19
    Thiago R. F. Peixoto; Hendrik Bentmann; Philipp Rüßmann; Abdul-Vakhab Tcakaev; Martin Winnerlein; Steffen Schreyeck; Sonja Schatz; Raphael Crespo Vidal; Fabian Stier; Volodymyr Zabolotnyy; Robert J. Green; Chul Hee Min; Celso I. Fornari; Henriette Maaß; Hari Babu Vasili; Pierluigi Gargiani; Manuel Valvidares; Alessandro Barla; Jens Buck; Moritz Hoesch; Florian Diekmann; Sebastian Rohlf; Matthias Kalläne;

    Since the discovery of the quantum anomalous Hall (QAH) effect in the magnetically doped topological insulators (MTI) Cr:(Bi,Sb)2Te3 and V:(Bi,Sb)2Te3, the search for the magnetic coupling mechanisms underlying the onset of ferromagnetism has been a central issue, and a variety of different scenarios have been put forward. By combining resonant photoemission, X-ray magnetic circular dichroism and density

  • Local electric-field control of multiferroic spin-spiral domains in TbMnO 3
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-11-18
    Peggy Schoenherr; Sebastian Manz; Lukas Kuerten; Konstantin Shapovalov; Ayato Iyama; Tsuyoshi Kimura; Manfred Fiebig; Dennis Meier

    Spin-spiral multiferroics exhibit a magnetoelectric coupling effects, leading to the formation of hybrid domains with inseparably entangled ferroelectric and antiferromagnetic order parameters. Due to this strong magnetoelectric coupling, conceptually advanced ways for controlling antiferromagnetism become possible and it has been reported that electric fields and laser pulses can reversibly switch

  • Observation of plaquette fluctuations in the spin-1/2 honeycomb lattice
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-11-13
    Christian Wessler; Bertrand Roessli; Karl W. Krämer; Bernard Delley; Oliver Waldmann; Lukas Keller; Denis Cheptiakov; Hans B. Braun; Michel Kenzelmann

    Quantum spin liquids are materials that feature quantum entangled spin correlations and avoid magnetic long-range order at T = 0 K. Particularly interesting are two-dimensional honeycomb spin lattices where a plethora of exotic quantum spin liquids have been predicted. Here, we experimentally study an effective S = 1/2 Heisenberg honeycomb lattice with competing nearest and next-nearest-neighbour interactions

  • Observing photo-induced chiral edge states of graphene nanoribbons in pump-probe spectroscopies
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-11-10
    Yuan Chen; Yao Wang; Martin Claassen; Brian Moritz; Thomas P. Devereaux

    Photo-induced edge states in low-dimensional materials have attracted considerable attention due to the tunability of topological properties and dispersion. Specifically, graphene nanoribbons have been predicted to host chiral edge modes upon irradiation with circularly polarized light. Here, we present numerical calculations of time-resolved angle resolved photoemission spectroscopy and trRIXS of

  • Quest for quantum states via field-altering technology
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-11-09
    Gang Cao; Hengdi Zhao; Bing Hu; Nicholas Pellatz; Dmitry Reznik; Pedro Schlottmann; Itamar Kimchi

    We report quantum phenomena in spin-orbit-coupled single crystals that are synthesized using an innovative technology that “field-alters” crystal structures via application of magnetic field during crystal growth. This study addresses a major challenge facing the research community today: A great deal of theoretical work predicting exotic states for strongly spin-orbit-coupled, correlated materials

  • Anderson–Kitaev spin liquid
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-11-06
    Masahiko G. Yamada

    The bond-disordered Kitaev model attracts much attention due to the experimental relevance in α-RuCl3 and A3LiIr2O6 (A = H, D, Ag, etc.). Applying a magnetic field to break the time-reversal symmetry leads to a strong modulation in mass terms for Dirac cones. Because of the smallness of the flux gap of the Kitaev model, a small bond disorder can have large influence on itinerant Majorana fermions.

  • Fractons from frustration in hole-doped antiferromagnets
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-11-05
    John Sous; Michael Pretko

    Recent theoretical research on tensor gauge theories led to the discovery of an exotic type of quasiparticles, dubbed fractons, that obey both charge and dipole conservation. Here we describe physical implementation of dipole conservation laws in realistic systems. We show that fractons find a natural realization in hole-doped antiferromagnets. There, individual holes are largely immobile, while dipolar

  • Photoinduced Dirac semimetal in ZrTe 5
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-11-04
    T. Konstantinova; L. Wu; W.-G. Yin; J. Tao; G. D. Gu; X. J. Wang; Jie Yang; I. A. Zaliznyak; Y. Zhu

    Novel phases of matter with unique properties that emerge from quantum and topological protection present an important thrust of modern research. Of particular interest is to engineer these phases on demand using ultrafast external stimuli, such as photoexcitation, which offers prospects of their integration into future devices compatible with optical communication and information technology. Here

  • Deconfinement of Mott localized electrons into topological and spin–orbit-coupled Dirac fermions
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-11-02
    José M. Pizarro; Severino Adler; Karim Zantout; Thomas Mertz; Paolo Barone; Roser Valentí; Giorgio Sangiovanni; Tim O. Wehling

    The interplay of electronic correlations, spin–orbit coupling and topology holds promise for the realization of exotic states of quantum matter. Models of strongly interacting electrons on honeycomb lattices have revealed rich phase diagrams featuring unconventional quantum states including chiral superconductivity and correlated quantum spin Hall insulators intertwining with complex magnetic order

  • Electron-phonon coupling induced intrinsic Floquet electronic structure
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-11-02
    Zhigang Song; Lin-Wang Wang

    Floquet states are a topic of intense contemporary interest, which is often induced by coherent external oscillating perturbation (e.g., laser, or microwave) which breaks the continuous time translational symmetry of the systems. Usually, electron–phonon coupling modifies the electronic structure of a crystal as a non-coherent perturbation and seems difficult to form Floquet states. Surprisingly, we

  • Resonant inelastic x-ray scattering study of vector chiral ordered kagome antiferromagnet
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-11-02
    Zijian Xiong; Trinanjan Datta; Dao-Xin Yao

    We study the resonant inelastic x-ray scattering (RIXS) features of vector chiral ordered kagome antiferromagnets. Utilizing a group theoretical formalism that respects lattice site symmetry, we calculated the L-edge magnon contribution for the vesignieite compound BaCu3V2O8(OH)2. We show that polarization dependence of the L-edge RIXS spectrum can be used to track magnon branches. We predict a non-zero

  • Re 1−x Mo x as an ideal test case of time-reversal symmetry breaking in unconventional superconductors
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-10-30
    Tian Shang; Christopher Baines; Lieh-Jeng Chang; Dariusz Jakub Gawryluk; Ekaterina Pomjakushina; Ming Shi; Marisa Medarde; Toni Shiroka

    Non-centrosymmetric superconductors (NCSCs) are promising candidates in the search for unconventional and topological superconductivity. The α-Mn-type rhenium-based alloys represent excellent examples of NCSCs, where spontaneous magnetic fields, peculiar to time-reversal symmetry (TRS) breaking, have been shown to develop in the superconducting phase. By converse, TRS is preserved in many other isostructural

  • Strong spin–orbit quenching via the product Jahn–Teller effect in neutral group IV qubits in diamond
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-10-30
    Christopher J. Ciccarino; Johannes Flick; Isaac B. Harris; Matthew E. Trusheim; Dirk R. Englund; Prineha Narang

    Artificial atom qubits in diamond have emerged as leading candidates for a range of solid-state quantum systems, from quantum sensors to repeater nodes in memory-enhanced quantum communication. Inversion-symmetric group IV vacancy centers, comprised of Si, Ge, Sn, and Pb dopants, hold particular promise as their neutrally charged electronic configuration results in a ground-state spin triplet, enabling

  • From magnetic order to quantum disorder in the Zn-barlowite series of S  = 1/2 kagomé antiferromagnets
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-10-23
    Katherine Tustain; Brendan Ward-O’Brien; Fabrice Bert; Tianheng Han; Hubertus Luetkens; Tom Lancaster; Benjamin M. Huddart; Peter J. Baker; Lucy Clark

    We report a comprehensive muon spectroscopy study of the Zn-barlowite series of \(S=\frac{1}{2}\) kagomé antiferromagnets, ZnxCu4−x(OH)6FBr, for x = 0.00 to 0.99(1). By combining muon spin relaxation and rotation measurements with state-of-the-art density-functional theory muon-site calculations, we observe the formation of both μ–F and μ–OH complexes in Zn-barlowite. From these stopping sites, implanted

  • Magnetic domain engineering in SrRuO 3 thin films
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-10-16
    Wenbo Wang; Lin Li; Junhua Liu; Binbin Chen; Yaoyao Ji; Jun Wang; Guanglei Cheng; Yalin Lu; Guus Rijnders; Gertjan Koster; Weida Wu; Zhaoliang Liao

    Magnetic domain engineering in ferromagnetic thin films is a very important route toward the rational design of spintronics and memory devices. Although the magnetic domain formation has been extensively studied, artificial control of magnetic domain remains challenging. Here, we present the control of magnetic domain formation in paradigmatic SrRuO3/SrTiO3 heterostructures via structural domain engineering

  • Coulomb blockade effects in a topological insulator grown on a high- T c cuprate superconductor
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-10-14
    Bryan Rachmilowitz; He Zhao; Zheng Ren; Hong Li; Konrad H. Thomas; John Marangola; Shang Gao; John Schneeloch; Ruidan Zhong; Genda Gu; Christian Flindt; Ilija Zeljkovic

    The evidence for proximity-induced superconductivity in heterostructures of topological insulators and high-Tc cuprates has been intensely debated. We use molecular-beam epitaxy to grow thin films of topological insulator Bi2Te3 on a cuprate Bi2Sr2CaCu2O8+x, and study the surface of Bi2Te3 using low-temperature scanning tunneling microscopy and spectroscopy. In few unit-cell thick Bi2Te3 films, we

  • Unexpected differences between surface and bulk spectroscopic and implied Kondo properties of heavy fermion CeRh 2 Si 2
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-10-06
    Georg Poelchen; Susanne Schulz; Max Mende; Monika Güttler; Alexander Generalov; Alexander V. Fedorov; Nubia Caroca-Canales; Christoph Geibel; Kristin Kliemt; Cornelius Krellner; Steffen Danzenbächer; Dmitry Yu. Usachov; Pavel Dudin; Victor N. Antonov; James W. Allen; Clemens Laubschat; Kurt Kummer; Yuri Kucherenko; Denis V. Vyalikh

    Ultra-violet angle-resolved photoemission spectroscopy (UV-ARPES) was used to explore the temperature dependence of the Ce-4f spectral responses for surface and bulk in the antiferromagnetic Kondo lattice CeRh2Si2. Spectra were taken from Ce- and Si-terminated surfaces in a wide temperature range, and reveal characteristic 4f patterns for weakly (surface) and strongly (bulk) hybridized Ce, respectively

  • Magic-angle semimetals
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-10-06
    Yixing Fu; Elio J. König; Justin H. Wilson; Yang-Zhi Chou; Jedediah H. Pixley

    Breakthroughs in two-dimensional van der Waals heterostructures have revealed that twisting creates a moiré pattern that quenches the kinetic energy of electrons, allowing for exotic many-body states. We show that cold atomic, trapped ion, and metamaterial systems can emulate the effects of a twist in many models from one to three dimensions. Further, we demonstrate at larger angles (and argue at smaller

  • Surface Josephson plasma waves in a high-temperature superconductor
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-10-01
    Qianbo Lu; Anthony T. Bollinger; Xi He; Robert Sundling; Ivan Bozovic; Adrian Gozar

    Electron density oscillations with acoustic dispersions and sustained at boundaries between different media provide information about surface and interface properties of heterostructures. In ultrathin metallic films these plasmonic excitations are heavily damped. Superconductivity is predicted to reduce dissipation allowing detection of these resonances. Emerging low-loss interface Cooper-pair waves

  • Tuning magnetic confinement of spin-triplet superconductivity
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-09-25
    Wen-Chen Lin; Daniel J. Campbell; Sheng Ran; I-Lin Liu; Hyunsoo Kim; Andriy H. Nevidomskyy; David Graf; Nicholas P. Butch; Johnpierre Paglione

    Electrical magnetoresistance and tunnel diode oscillator measurements were performed under external magnetic fields up to 41 T applied along the crystallographic b axis (hard axis) of UTe2 as a function of temperature and applied pressures up to 18.8 kbar. In this work, we track the field-induced first-order transition between superconducting and magnetic field-polarized phases as a function of applied

  • Strongly correlated superconductor with polytypic 3D Dirac points
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-09-18
    Sergey Borisenko; Volodymyr Bezguba; Alexander Fedorov; Yevhen Kushnirenko; Vladimir Voroshnin; Mihai Sturza; Saicharan Aswartham; Alexander Yaresko

    Topological superconductors should be able to provide essential ingredients for quantum computing, but are very challenging to realize. Spin–orbit interaction in iron-based superconductors opens the energy gap between the p-states of pnictogen and d-states of iron very close to the Fermi level, and such p-states have been recently experimentally detected. Density-functional theory predicts existence

  • Aberrant electronic and structural alterations in pressure tuned perovskite NaOsO 3
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-09-16
    Raimundas Sereika; Peitao Liu; Bongjae Kim; Sooran Kim; Jianbo Zhang; Bijuan Chen; Kazunari Yamaura; Changyong Park; Cesare Franchini; Yang Ding; Ho-kwang Mao

    The perovskite NaOsO3 has a metal–insulator transition at temperature 410 K, which is delicate, intriguing, and provokes a lot of debate on its nature. Our combined electrical resistance, Raman, and synchrotron x-ray diffraction experiments show that the insulating ground state in this osmate endures under high pressure up to at least 35 GPa. In this pressure range, compression reveals hidden hysteretic

  • Identification of non-Fermi liquid fermionic self-energy from quantum Monte Carlo data
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-09-11
    Xiao Yan Xu; Avraham Klein; Kai Sun; Andrey V. Chubukov; Zi Yang Meng

    Quantum Monte Carlo (QMC) simulations of correlated electron systems provide unbiased information about system behavior at a quantum critical point (QCP) and can verify or disprove the existing theories of non-Fermi liquid (NFL) behavior at a QCP. However, simulations are carried out at a finite temperature, where quantum critical features are masked by finite-temperature effects. Here, we present

  • Signature of gate-controlled magnetism and localization effects at Bi 2 Se 3 /EuS interface
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-09-09
    Subramanian Mathimalar; Satyaki Sasmal; Archit Bhardwaj; Sekar Abhaya; Rajasekhar Pothala; Saurabh Chaudhary; Biswarup Satpati; Karthik V. Raman

    Proximity of a topological insulator (TI) surface with a magnetic insulator (MI) can open an exchange gap at the Dirac point leading to exploration of surface quantum anomalous Hall effect. An important requirement to observe the above effect is to prevent the topological breakdown of the surface states (SSs) due to various interface coupling effects and to tune the Fermi level at the interface near

  • On the topological immunity of corner states in two-dimensional crystalline insulators
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-09-08
    Guido van Miert; Carmine Ortix

    A higher-order topological insulator (HOTI) in two dimensions is an insulator without metallic edge states but with robust zero-dimensional topological boundary modes localized at its corners. Yet, these corner modes do not carry a clear signature of their topology as they lack the anomalous nature of helical or chiral boundary states. Here, we demonstrate using immunity tests that the corner modes

  • Quantum oscillations from networked topological interfaces in a Weyl semimetal
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-09-07
    I-Lin Liu; Colin Heikes; Taner Yildirim; Chris Eckberg; Tristin Metz; Hyunsoo Kim; Sheng Ran; William D. Ratcliff; Johnpierre Paglione; Nicholas P. Butch

    Layered transition metal chalcogenides are promising hosts of electronic Weyl nodes and topological superconductivity. MoTe2 is a striking example that harbors both noncentrosymmetric Td and centrosymmetric T’ phases, both of which have been identified as topologically nontrivial. Applied pressure tunes the structural transition separating these phases to zero temperature, stabilizing a mixed Td–T’

  • Unusual magnetoelectric effect in paramagnetic rare-earth langasite
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-09-07
    Lukas Weymann; Lorenz Bergen; Thomas Kain; Anna Pimenov; Alexey Shuvaev; Evan Constable; David Szaller; Boris V. Mill; Artem M. Kuzmenko; Vsevolod Yu. Ivanov; Nadezhda V. Kostyuchenko; Alexander I. Popov; Anatoly K. Zvezdin; Andrei Pimenov; Alexander A. Mukhin; Maxim Mostovoy

    Violation of time reversal and spatial inversion symmetries has profound consequences for elementary particles and cosmology. Spontaneous breaking of these symmetries at phase transitions gives rise to unconventional physical phenomena in condensed matter systems, such as ferroelectricity induced by magnetic spirals, electromagnons, non-reciprocal propagation of light and spin waves, and the linear

  • Complete reversal of the atomic unquenched orbital moment by a single electron
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-08-27
    Rasa Rejali; David Coffey; Jeremie Gobeil; Jhon W. González; Fernando Delgado; Alexander F. Otte

    The orbital angular moment of magnetic atoms adsorbed on surfaces is often quenched as a result of an anisotropic crystal field. Due to spin-orbit coupling, what remains of the orbital moment typically delineates the orientation of the electron spin. These two effects limit the scope of information processing based on these atoms to essentially only one magnetic degree of freedom: the spin. In this

  • Nickelate superconductors—a renaissance of the one-band Hubbard model
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-08-21
    Motoharu Kitatani; Liang Si; Oleg Janson; Ryotaro Arita; Zhicheng Zhong; Karsten Held

    The recently discovered nickelate superconductors appear, at first glance, to be even more complicated multi-orbital systems than cuprates. To identify the simplest model describing the nickelates, we analyse the multi-orbital system and find that it is instead the nickelates which can be described by a one-band Hubbard model, albeit with an additional electron reservoir and only around the superconducting

  • Band gap crossover and insulator–metal transition in the compressed layered CrPS 4
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-08-18
    Resta A. Susilo; Bo Gyu Jang; Jiajia Feng; Qianheng Du; Zhipeng Yan; Hongliang Dong; Mingzhi Yuan; Cedomir Petrovic; Ji Hoon Shim; Duck Young Kim; Bin Chen

    Two-dimensional van der Waals (vdW) magnetic materials have emerged as possible candidates for future ultrathin spintronic devices, and finding a way to tune their physical properties is desirable for wider applications. Owing to the sensitivity and tunability of the physical properties to the variation of interatomic separations, this class of materials is attractive to explore under pressure. Here

  • Correlated states in magic angle twisted bilayer graphene under the optical conductivity scrutiny
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-08-13
    María J. Calderón; Elena Bascones

    Moiré systems displaying flat bands have emerged as novel platforms to study correlated electron phenomena. Insulating and superconducting states appear upon doping magic angle twisted bilayer graphene (TBG), and there is evidence of correlation induced effects at the charge neutrality point (CNP) which could originate from spontaneous symmetry breaking. Our theoretical calculations show how optical

  • Piezochromism in the magnetic chalcogenide MnPS 3
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-08-12
    Nathan C. Harms; Heung-Sik Kim; Amanda J. Clune; Kevin A. Smith; Kenneth R. O’Neal; Amanda V. Haglund; David G. Mandrus; Zhenxian Liu; Kristjan Haule; David Vanderbilt; Janice L. Musfeldt

    van der Waals materials are exceptionally responsive to external stimuli. Pressure-induced layer sliding, metallicity, and superconductivity are fascinating examples. Inspired by opportunities in this area, we combined high-pressure optical spectroscopies and first-principles calculations to reveal piezochromism in MnPS3. Dramatic color changes (green → yellow → red → black) take place as the charge

  • Hidden and mirage collective modes in two dimensional Fermi liquids
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-08-05
    Avraham Klein; Dmitrii L. Maslov; Andrey V. Chubukov

    The longstanding view of the zero sound mode in a Fermi liquid is that for repulsive interaction it resides outside the particle-hole continuum and gives rise to a sharp peak in the corresponding susceptibility, while for attractive interaction it is a resonance inside the particle-hole continuum. We argue that in a two-dimensional Fermi liquid there exist two additional types of zero sound: “hidden”

  • Tunable 3D/2D magnetism in the (MnBi 2 Te 4 )(Bi 2 Te 3 ) m topological insulators family
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-08-03
    Ilya I. Klimovskikh; Mikhail M. Otrokov; Dmitry Estyunin; Sergey V. Eremeev; Sergey O. Filnov; Alexandra Koroleva; Eugene Shevchenko; Vladimir Voroshnin; Artem G. Rybkin; Igor P. Rusinov; Maria Blanco-Rey; Martin Hoffmann; Ziya S. Aliev; Mahammad B. Babanly; Imamaddin R. Amiraslanov; Nadir A. Abdullayev; Vladimir N. Zverev; Akio Kimura; Oleg E. Tereshchenko; Konstantin A. Kokh; Luca Petaccia; Giovanni

    Feasibility of many emergent phenomena that intrinsic magnetic topological insulators (TIs) may host depends crucially on our ability to engineer and efficiently tune their electronic and magnetic structures. Here we report on a large family of intrinsic magnetic TIs in the homologous series of the van der Waals compounds (MnBi2Te4)(Bi2Te3)m with m = 0, ⋯, 6. Magnetic, electronic and, consequently

  • DC Hall coefficient of the strongly correlated Hubbard model
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-07-24
    Wen O. Wang; Jixun K. Ding; Brian Moritz; Edwin W. Huang; Thomas P. Devereaux

    The Hall coefficient is related to the effective carrier density and Fermi surface topology in non-interacting and weakly interacting systems. In strongly correlated systems, the relation between the Hall coefficient and single-particle properties is less clear. Clarifying this relation would give insight into the nature of transport in strongly correlated materials that lack well-formed quasiparticles

  • Evidence for topological semimetallicity in a chain-compound TaSe 3
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-07-24
    Ahmad Ikhwan Us Saleheen; Ramakanta Chapai; Lingyi Xing; Roshan Nepal; Dongliang Gong; Xin Gui; Weiwei Xie; David P. Young; E. W. Plummer; Rongying Jin

    Among one-dimensional transition-metal trichalcogenides, TaSe3 is unconventional in many respects. One is its strong topological semimetallicity as predicted by first-principles calculations. We report the experimental investigations of the electronic properties of one-dimensional-like TaSe3 single crystals. While the b-axis electrical resistivity shows good metallicity with a high residual resistivity

  • A first-principle perspective on electronic nematicity in FeSe
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-07-24
    Xuanyu Long; Shunhong Zhang; Fa Wang; Zheng Liu

    Electronic nematicity is an important order in most iron-based superconductors, and FeSe represents a special example, in which nematicity disentangles from spin ordering. A first-principle description of this order remains elusive. Here, we show that by carefully searching the paramagnetic energy landscape within the density functional theory, a nematic solution stands out at either the +U or hybrid

  • Colossal magnetoresistance in a nonsymmorphic antiferromagnetic insulator
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-07-24
    Priscila Rosa; Yuanfeng Xu; Marein Rahn; Jean Souza; Satya Kushwaha; Larissa Veiga; Alessandro Bombardi; Sean Thomas; Marc Janoschek; Eric Bauer; Mun Chan; Zhijun Wang; Joe Thompson; Neil Harrison; Pascoal Pagliuso; Andrei Bernevig; Filip Ronning

    Here we investigate antiferromagnetic Eu5In2Sb6, a nonsymmorphic Zintl phase. Our electrical transport data show that Eu5In2Sb6 is remarkably insulating and exhibits an exceptionally large negative magnetoresistance, which is consistent with the presence of magnetic polarons. From ab initio calculations, the paramagnetic state of Eu5In2Sb6 is a topologically nontrivial semimetal within the generalized

  • Direct visualization of irreducible ferrielectricity in crystals
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-07-23
    Kai Du; Lei Guo; Jin Peng; Xing Chen; Zheng-Nan Zhou; Yang Zhang; Ting Zheng; Yan-Ping Liang; Jun-Peng Lu; Zhen-Hua Ni; Shan-Shan Wang; Gustaaf Van Tendeloo; Ze Zhang; Shuai Dong; He Tian

    In solids, charge polarity can one-to-one correspond to spin polarity phenomenologically, e.g., ferroelectricity/ferromagnetism, antiferroelectricity/antiferromagnetism, and even dipole-vortex/magnetic-vortex, but ferrielectricity/ferrimagnetism kept telling a disparate story in microscopic level. Since the definition of a charge dipole involves more than one ion, there may be multiple choices for

  • Kondo scenario of the γ – α phase transition in single crystalline cerium thin films
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-07-10
    Xie-Gang Zhu; Yu Liu; Ya-Wen Zhao; Yue-Chao Wang; Yun Zhang; Chao Lu; Yu Duan; Dong-Hua Xie; Wei Feng; Dan Jian; Yong-Huan Wang; Shi-Yong Tan; Qin Liu; Wen Zhang; Yi Liu; Li-Zhu Luo; Xue-Bing Luo; Qiu-Yun Chen; Hai-Feng Song; Xin-Chun Lai

    The physical mechanism driving the γ–α phase transition of face-centre-cubic (fcc) cerium (Ce) remains controversial until now. In this work, high-quality single crystalline fcc–Ce thin films were grown on Graphene/6H-SiC(0001) substrate, and explored by XRD and ARPES measurement. XRD spectra showed a clear γ–α phase transition at Tγ−α ≈ 50 K, which is retarded by strain effect from substrate comparing

  • The relevance of ARPES to high- T c superconductivity in cuprates
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-07-09
    Tianlun Yu; Christian E. Matt; Federico Bisti; Xiaoqiang Wang; Thorsten Schmitt; Johan Chang; Hiroshi Eisaki; Donglai Feng; Vladimir N. Strocov

    Angle-resolved photoemission spectroscopy, visualizing the superconducting gap in k-space, plays a pivotal role in research on cuprates and other high-Tc superconducting materials. However, there has always been an imminent doubt whether this technique truly represents the intrinsic bulk spectral function, whose response can be distorted by energy- and k-dependence of the photoexcitation matrix element

  • Publisher Correction: Materializing rival ground states in the barlowite family of kagome magnets: quantum spin liquid, spin ordered, and valence bond crystal states
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-07-07
    Rebecca W. Smaha; Wei He; Jack Mingde Jiang; Jiajia Wen; Yi-Fan Jiang; John P. Sheckelton; Charles J. Titus; Suyin Grass Wang; Yu-Sheng Chen; Simon J. Teat; Adam A. Aczel; Yang Zhao; Guangyong Xu; Jeffrey W. Lynn; Hong-Chen Jiang; Young S. Lee

    An amendment to this paper has been published and can be accessed via a link at the top of the paper.

  • Field-induced resistance peak in a superconducting niobium thin film proximity coupled to a surface reconstructed SrTiO 3
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-07-06
    Akhilesh Kr. Singh; Uddipta Kar; Matthew D. Redell; Tsung-Chi Wu; Wei-Hsiang Peng; Bipul Das; Satish Kumar; Wei-Cheng Lee; Wei-Li Lee

    Oxygen vacancy is known to play an important role for the physical properties in SrTiO3(STO)-based systems. On the surface, rich structural reconstructions had been reported owing to the oxygen vacancies, giving rise to metallic surface states and unusual surface phonon modes. More recently, an intriguing phenomenon of a huge superconducting transition temperature enhancement was discovered in a monolayer

  • Macroscopic manifestation of domain-wall magnetism and magnetoelectric effect in a Néel-type skyrmion host
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-07-06
    Korbinian Geirhos; Boris Gross; Bertalan G. Szigeti; Andrea Mehlin; Simon Philipp; Jonathan S. White; Robert Cubitt; Sebastian Widmann; Somnath Ghara; Peter Lunkenheimer; Vladimir Tsurkan; Erik Neuber; Dmytro Ivaneyko; Peter Milde; Lukas M. Eng; Andrey O. Leonov; Sándor Bordács; Martino Poggio; István Kézsmárki

    We report a magnetic state in GaV4Se8 which emerges exclusively in samples with mesoscale polar domains and not in polar mono-domain crystals. It is manifested by a sharp anomaly in the magnetic susceptibility and the magnetic torque, distinct from other anomalies observed also in polar mono-domain samples upon transitions between the cycloidal, the Néel-type skyrmion lattice and the ferromagnetic

  • A proposal for reconciling diverse experiments on the superconducting state in Sr 2 RuO 4
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-06-30
    Steven Allan Kivelson; Andrew Chang Yuan; Brad Ramshaw; Ronny Thomale

    A variety of precise experiments have been carried out to establish the character of the superconducting state in Sr2RuO4. Many of these appear to imply contradictory conclusions concerning the symmetries of this state. Here we propose that these results can be reconciled if we assume that there is a near-degeneracy between a \({d}_{{x}^{2}-{y}^{2}}\) (B1g in group theory nomenclature) and a \({g}

  • Large Josephson current in Weyl nodal loop semimetals due to odd-frequency superconductivity
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-06-25
    Fariborz Parhizgar; Annica M. Black-Schaffer

    Weyl nodal loop semimetals (WNLs) host a closed nodal line loop Fermi surface in the bulk, protected zero-energy flat band, or drumhead, surface states, and strong spin-polarization. The large density of states of the drumhead states makes WNL semimetals exceedingly prone to electronic ordering. At the same time, the spin-polarization naively prevents conventional superconductivity due to its spin-singlet

  • Pressure-induced topological superconductivity in the spin–orbit Mott insulator GaTa 4 Se 8
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-06-24
    Moon Jip Park; GiBaik Sim; Min Yong Jeong; Archana Mishra; Myung Joon Han; SungBin Lee

    Lacunar spinel GaTa4Se8 is a unique example of spin–orbit coupled Mott insulator described by molecular jeff = 3/2 states. It becomes superconducting at Tc = 5.8 K under pressure without doping. In this work, we show, this pressure-induced superconductivity is a realization of a new type topological phase characterized by spin-2 Cooper pairs. Starting from first-principles density functional calculations

  • Quantum Monte Carlo study of lattice polarons in the two-dimensional three-orbital Su–Schrieffer–Heeger model
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-06-19
    Shaozhi Li; Steven Johnston

    The electron–lattice interaction gives rise to a rich set of phenomena in quantum materials. Microscopically, this interaction often arises from the modulation of orbital overlaps; however, many theoretical studies neglect such couplings. Here, we present an exact diagonalization and determinant quantum Monte Carlo study of a three-orbital Su–Schrieffer–Heeger (SSH) model, on a two-dimensional Lieb

  • Spin memory of the topological material under strong disorder
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-06-18
    Inna Korzhovska; Haiming Deng; Lukas Zhao; Yury Deshko; Zhiyi Chen; Marcin Konczykowski; Shihua Zhao; Simone Raoux; Lia Krusin-Elbaum

    Robustness to disorder is the defining property of any topological state. The ultimate disorder limits to topological protection are still unknown, although a number of theories predict that even in the amorphous state a quantized conductance might yet reemerge. Here we report that in strongly disordered thin films of the topological material Sb2Te3 disorder-induced spin correlations dominate transport

  • Pressure-induced superconductivity and topological phase transitions in the topological nodal-line semimetal SrAs 3
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-06-16
    Erjian Cheng; Wei Xia; Xianbiao Shi; Zhenhai Yu; Lin Wang; Limin Yan; Darren C. Peets; Chuchu Zhu; Hao Su; Yong Zhang; Dongzhe Dai; Xia Wang; Zhiqiang Zou; Na Yu; Xufeng Kou; Wenge Yang; Weiwei Zhao; Yanfeng Guo; Shiyan Li

    Topological nodal-line semimetals (TNLSMs) are materials whose conduction and valence bands cross each other, meeting a topologically protected closed loop rather than discrete points in the Brillouin zone (BZ). The anticipated properties for TNLSMs, include drumhead-like nearly flat surface states, unique Landau energy levels, special collective modes, long-range Coulomb interactions, or the possibility

  • Trompe L’oeil Ferromagnetism
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-06-03
    Sang-Wook Cheong

    The characteristics of ferro-(ferri)magnetism with non-zero magnetization include magnetic attraction, magnetic circular dichroism, and magneto-optical Kerr (MOKE), Faraday, and various anomalous Hall-type (Hall, Ettingshausen, Nernst, and thermal Hall) effects. Non-magnetic or antiferromagnetic materials in external electric fields or other environments (called specimen constituents) can share symmetry

  • Large Zeeman splitting induced anomalous Hall effect in ZrTe 5
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-06-02
    Zeliang Sun; Zhipeng Cao; Jianhua Cui; Changsheng Zhu; Donghui Ma; Honghui Wang; Weizhuang Zhuo; Zhaohui Cheng; Zhenyu Wang; Xiangang Wan; Xianhui Chen

    Berry phase effects have significant influences on the electronic properties of condensed matter. In particular, the anomalous Hall conductivity has been recognized as an intrinsic property of the systems with non-zero Berry curvature. Here, we present the anomalous Hall effect observed in the non-magnetic material ZrTe5, which hosts a large Zeeman splitting with Landé g-factor of 26.49. The quantum

  • The sub-band structure of atomically sharp dopant profiles in silicon
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-06-01
    Federico Mazzola; Chin-Yi Chen; Rajib Rahman; Xie-Gang Zhu; Craig M. Polley; Thiagarajan Balasubramanian; Phil D. C. King; Philip Hofmann; Jill A. Miwa; Justin W. Wells

    The downscaling of silicon-based structures and proto-devices has now reached the single-atom scale, representing an important milestone for the development of a silicon-based quantum computer. One especially notable platform for atomic-scale device fabrication is the so-called Si:P δ-layer, consisting of an ultra-dense and sharp layer of dopants within a semiconductor host. Whilst several alternatives

  • A tunable and unidirectional one-dimensional electronic system Nb 2n+1 Si n Te 4n+2
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-06-01
    Zhen Zhu; Si Li; Meng Yang; Xiao-Ang Nie; Hao-Ke Xu; Xu Yang; Dan-Dan Guan; Shiyong Wang; Yao-Yi Li; Canhua Liu; Zhi-Qiang Mao; Nan Xu; Yugui Yao; Shengyuan A. Yang; You-Guo Shi; Hao Zheng; Jin-Feng Jia

    One dimensional (1D) electronic system is a versatile platform hosting novel physics, such as charge density wave, Su-Schrieffer-Heeger (SSH) topological state and solitons, Tomonaga-Luttinger Liquid etc. Here, we systematically study the surface electronic properties on layered composition-tunable compounds Nb2n+1SinTe4n+2 (n = 1–5), which is predicted to be a nodal-line semimetal when n = 1 (Nb3SiTe6)

  • Structure and magnetic properties of epitaxial CaFe 2 O 4 thin films
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-06-01
    Silvia Damerio; Pavan Nukala; Jean Juraszek; Pim Reith; Hans Hilgenkamp; Beatriz Noheda

    CaFe2O4 is a highly anisotropic antiferromagnet reported to display two spin arrangements with up–up–down–down (phase A) and up–down–up–down (phase B) configurations. The relative stability of these phases is ruled by the competing ferromagnetic and antiferromagnetic interactions between Fe3+ spins arranged in two different environments, but a complete understanding of the magnetic structure of this

  • Low-temperature spin dynamics of ferromagnetic molecular ring {Cr 8 Y 8 }
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-05-18
    Zhendong Fu; Lei Qin; Kai Sun; Lijie Hao; Yan-Zhen Zheng; Wiebke Lohstroh; Gerrit Günther; Margarita Russina; Yuntao Liu; Yinguo Xiao; Wentao Jin; Dongfeng Chen

    The spin dynamics of {Cr8Y8}, a rare example of ferromagnetic molecular rings, has been studied by inelastic neutron scattering (INS) and heat capacity (HC) methods. Clear evidence of low-lying magnetic excitation has been found. Magnetic Schottky anomalies are observed in low-temperature (low-T) HC curves measured under various fields and can be well fitted with a multi-level Schottky term, giving

  • Suppression of superconductivity and enhanced critical field anisotropy in thin flakes of FeSe
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-05-15
    Liam S. Farrar; Matthew Bristow; Amir A. Haghighirad; Alix McCollam; Simon J. Bending; Amalia I. Coldea

    FeSe is a unique superconductor that can be manipulated to enhance its superconductivity using different routes, while its monolayer form grown on different substrates reaches a record high temperature for a two-dimensional system. In order to understand the role played by the substrate and the reduced dimensionality on superconductivity, we examine the superconducting properties of exfoliated FeSe

  • Materials with strong spin-textured bands
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-05-15
    Zhaoliang Liao; Peiheng Jiang; Zhicheng Zhong; Run-Wei Li

    The materials that exhibit strong spin-textured bands are rapidly attracting more and more attention in past few years. In this new class of quantum materials, the band structures are strongly influenced by spin/magnetization direction, affording new twist to control topological behaviors, quantum anomalous Hall effect, transport, and optical properties by rotating the spin/magnetization. The control

  • Electronic and magnetic structure of infinite-layer NdNiO 2 : trace of antiferromagnetic metal
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-05-15
    Zhao Liu; Zhi Ren; Wei Zhu; Zhengfei Wang; Jinlong Yang

    The recent discovery of Sr-doped infinite-layer nickelate NdNiO2 offers a new platform for investigating unconventional superconductivity in nickelate-based compounds. Most intriguingly, the resistivity minimum and Hall coefficient drop were identified simultaneously in the experiment, reflecting a novel electronic structure and transport property of NdNiO2. Driven by this pioneering work, we present

  • Emergence of superconductivity in doped multiorbital Hubbard chains
    npj Quant. Mater. (IF 6.562) Pub Date : 2020-05-08
    Niravkumar D. Patel; Nitin Kaushal; Alberto Nocera; Gonzalo Alvarez; Elbio Dagotto

    We introduce a variational state for one-dimensional two-orbital Hubbard models that intuitively explains the recent computational discovery of pairing in these systems when hole doped. Our ansatz is an optimized linear superposition of Affleck–Kennedy–Lieb–Tasaki valence-bond states, rendering the combination a valence-bond liquid dubbed orbital resonant valence bond. We show that the undoped (one-electron/orbital)

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