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  • Fast- and slow-light-enhanced light drag in a moving microcavity
    Commun. Phys. (IF 4.684) Pub Date : 2020-06-29
    Tian Qin; Jianfan Yang; Fangxing Zhang; Yao Chen; Dongyi Shen; Wei Liu; Lei Chen; Xiaoshun Jiang; Xianfeng Chen; Wenjie Wan

    Fizeau’s experiment, inspiring Einstein’s special theory of relativity, reveals a small dragging effect acting on light inside a moving medium. Dispersion can enhance such light drag according to Lorentz’s predication. Here fast- and slow-light-enhanced light drag is demonstrated experimentally in a moving optical microcavity through stimulated Brillouin scattering induced transparency and absorption

  • Electronic and magnetic characterization of epitaxial VSe 2 monolayers on superconducting NbSe 2
    Commun. Phys. (IF 4.684) Pub Date : 2020-06-26
    Shawulienu Kezilebieke; Md Nurul Huda; Paul Dreher; Ilkka Manninen; Yifan Zhou; Jani Sainio; Rhodri Mansell; Miguel M. Ugeda; Sebastiaan van Dijken; Hannu-Pekka Komsa; Peter Liljeroth

    There has been enormous recent interest in heterostructures of two-dimensional van der Waals materials. Integrating materials with different quantum ground states in vertical heterostructures is predicted to lead to novel electronic properties that are not found in the constituent layers. Here, we present direct synthesis of a superconductor-magnet hybrid heterostructure by combining superconducting

  • A weak values approach for testing simultaneous Einstein–Podolsky–Rosen elements of reality for non-commuting observables
    Commun. Phys. (IF 4.684) Pub Date : 2020-06-26
    Omar Calderón-Losada; Tonatiuh T. Moctezuma Quistian; Hector Cruz-Ramirez; Sebastián Murgueitio Ramirez; Alfred B. U’Ren; Alonso Botero; Alejandra Valencia

    In questioning the completeness of quantum mechanics, Einstein–Podolsky–Rosen (EPR) claimed that from the outcomes of local experiments performed on an entangled system, it was possible to ascribe simultaneous reality to the values of certain incompatible observables. As EPR acknowledged, the inevitable disturbance of quantum measurements prevents the precise verification of these assertions on a single

  • Thermal conductance across harmonic-matched epitaxial Al-sapphire heterointerfaces
    Commun. Phys. (IF 4.684) Pub Date : 2020-06-24
    Zhe Cheng; Yee Rui Koh; Habib Ahmad; Renjiu Hu; Jingjing Shi; Michael E. Liao; Yekan Wang; Tingyu Bai; Ruiyang Li; Eungkyu Lee; Evan A. Clinton; Christopher M. Matthews; Zachary Engel; Luke Yates; Tengfei Luo; Mark S. Goorsky; W. Alan Doolittle; Zhiting Tian; Patrick E. Hopkins; Samuel Graham

    A unified fundamental understanding of interfacial thermal transport is missing due to the complicated nature of interfaces. Because of the difficulty to grow high-quality interfaces and lack of materials characterization, the experimentally measured thermal boundary conductance (TBC) in the literature are usually not the same as the ideally modelled interfaces. This work provides a systematic study

  • Ultrafast all-optical switching enabled by epsilon-near-zero-tailored absorption in metal-insulator nanocavities
    Commun. Phys. (IF 4.684) Pub Date : 2020-06-24
    Joel Kuttruff; Denis Garoli; Jonas Allerbeck; Roman Krahne; Antonio De Luca; Daniele Brida; Vincenzo Caligiuri; Nicolò Maccaferri

    Ultrafast control of light−matter interactions is fundamental in view of new technological frontiers of information processing. However, conventional optical elements are either static or feature switching speeds that are extremely low with respect to the time scales at which it is possible to control light. Here, we exploit the artificial epsilon-near-zero (ENZ) modes of a metal-insulator-metal nanocavity

  • Magnetically powered metachronal waves induce locomotion in self-assemblies
    Commun. Phys. (IF 4.684) Pub Date : 2020-06-19
    Ylona Collard; Galien Grosjean; Nicolas Vandewalle

    When tiny soft ferromagnetic particles are placed along a liquid interface and exposed to a vertical magnetic field, the balance between capillary attraction and magnetic repulsion leads to self-organization into well-defined patterns. Here, we demonstrate experimentally that precessing magnetic fields induce metachronal waves on the periphery of these assemblies, similar to the ones observed in ciliates

  • Electrical nucleation, displacement, and detection of antiferromagnetic domain walls in the chiral antiferromagnet Mn 3 Sn
    Commun. Phys. (IF 4.684) Pub Date : 2020-06-19
    Satoshi Sugimoto; Yoshinobu Nakatani; Yuta Yamane; Muhammad Ikhlas; Kouta Kondou; Motoi Kimata; Takahiro Tomita; Satoru Nakatsuji; Yoshichika Otani

    Antiferromagnets exhibiting distinctive responses to the electric and magnetic fields have attracted attention as breakthrough materials in spintronics. The current-induced Néel-order spin-orbit torque can manipulate the antiferromagnetic domain wall (AFDW) in a collinear CuMnAs owing to a lack of local inversion symmetry. Here, we demonstrate that the electrical nucleation, displacement, and detection

  • Experimental device-independent certified randomness generation with an instrumental causal structure
    Commun. Phys. (IF 4.684) Pub Date : 2020-06-18
    Iris Agresti; Davide Poderini; Leonardo Guerini; Michele Mancusi; Gonzalo Carvacho; Leandro Aolita; Daniel Cavalcanti; Rafael Chaves; Fabio Sciarrino

    The intrinsic random nature of quantum physics offers novel tools for the generation of random numbers, a central challenge for a plethora of fields. Bell non-local correlations obtained by measurements on entangled states allow for the generation of bit strings whose randomness is guaranteed in a device-independent manner, i.e. without assumptions on the measurement and state-generation devices. Here

  • Author Correction: Joule overheating poisons the fractional ac Josephson effect in topological Josephson junctions
    Commun. Phys. (IF 4.684) Pub Date : 2020-06-16
    Kévin Le Calvez; Louis Veyrat; Frédéric Gay; Philippe Plaindoux; Clemens B. Winkelmann; Hervé Courtois; Benjamin Sacépé

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

  • Large-scale Ising emulation with four body interaction and all-to-all connections
    Commun. Phys. (IF 4.684) Pub Date : 2020-06-12
    Santosh Kumar; He Zhang; Yu-Ping Huang

    Optical Ising machines with two-body interactions have shown potential in solving combinatorial optimization problems which are extremely hard to solve with digital computers. Yet, some physical systems cannot be properly described by only two-body interactions. Here, we propose and demonstrate a nonlinear optics approach to emulate Ising machines containing many spins (up to a million in the absence

  • Analogue of electromagnetically induced absorption in the microwave domain using stimulated Brillouin scattering
    Commun. Phys. (IF 4.684) Pub Date : 2020-06-12
    Siva Shakthi A.; Anjali B. Yelikar; Ravi Pant

    Electromagnetically induced transparency/absorption (EIT/EIA) tailor the amplitude and phase response of an absorption resonance to create large dispersion, which has been exploited for applications in slow- and fast-light, and quantum information science. Since EIA enhances (induces) absorption of an already existing absorption (transmission) profile, it leads to a significant reduction in output

  • Structural trends in atomic nuclei from laser spectroscopy of tin
    Commun. Phys. (IF 4.684) Pub Date : 2020-06-08
    Deyan T. Yordanov; Liss V. Rodríguez; Dimiter L. Balabanski; Jacek Bieroń; Mark L. Bissell; Klaus Blaum; Bradley Cheal; Jörgen Ekman; Gediminas Gaigalas; Ronald F. Garcia Ruiz; Georgi Georgiev; Wouter Gins; Michel R. Godefroid; Christian Gorges; Zoltán Harman; Hanne Heylen; Per Jönsson; Anastasios Kanellakopoulos; Simon Kaufmann; Christoph H. Keitel; Varvara Lagaki; Simon Lechner; Bernhard Maaß; Stephan

    Tin is the chemical element with the largest number of stable isotopes. Its complete proton shell, comparable with the closed electron shells in the chemically inert noble gases, is not a mere precursor to extended stability; since the protons carry the nuclear charge, their spatial arrangement also drives the nuclear electromagnetism. We report high-precision measurements of the electromagnetic moments

  • Multifractality of light in photonic arrays based on algebraic number theory
    Commun. Phys. (IF 4.684) Pub Date : 2020-06-08
    Fabrizio Sgrignuoli; Sean Gorsky; Wesley A. Britton; Ran Zhang; Francesco Riboli; Luca Dal Negro

    Many natural patterns and shapes, such as meandering coastlines, clouds, or turbulent flows, exhibit a characteristic complexity that is mathematically described by fractal geometry. Here, we extend the reach of fractal concepts in photonics by experimentally demonstrating multifractality of light in arrays of dielectric nanoparticles that are based on fundamental structures of algebraic number theory

  • Mode-assisted unsupervised learning of restricted Boltzmann machines
    Commun. Phys. (IF 4.684) Pub Date : 2020-06-05
    Haik Manukian; Yan Ru Pei; Sean R. B. Bearden; Massimiliano Di Ventra

    Restricted Boltzmann machines (RBMs) are a powerful class of generative models, but their training requires computing a gradient that, unlike supervised backpropagation on typical loss functions, is notoriously difficult even to approximate. Here, we show that properly combining standard gradient updates with an off-gradient direction, constructed from samples of the RBM ground state (mode), improves

  • Entanglement-enhanced testing of multiple quantum hypotheses
    Commun. Phys. (IF 4.684) Pub Date : 2020-06-02
    Quntao Zhuang; Stefano Pirandola

    Quantum hypothesis testing has been greatly advanced for the binary discrimination of two states, or two channels. In this setting, we already know that quantum entanglement can be used to enhance the discrimination of two bosonic channels. Here, we remove the restriction of binary hypotheses and show that entangled photons can remarkably boost the discrimination of multiple bosonic channels. More

  • Twin beam quantum-enhanced correlated interferometry for testing fundamental physics
    Commun. Phys. (IF 4.684) Pub Date : 2020-06-02
    S. T. Pradyumna; E. Losero; I. Ruo-Berchera; P. Traina; M. Zucco; C. S. Jacobsen; U. L. Andersen; I. P. Degiovanni; M. Genovese; T. Gehring

    Quantum metrology deals with improving the resolution of instruments that are otherwise limited by shot noise and it is therefore a promising avenue for enabling scientific breakthroughs. The advantage can be even more striking when quantum enhancement is combined with correlation techniques among several devices. Here, we present and realize a correlation interferometry scheme exploiting bipartite

  • Macroscopic matter wave quantum tunnelling
    Commun. Phys. (IF 4.684) Pub Date : 2020-06-01
    Khemendra Shukla; Po-Sung Chen; Jun-Ren Chen; Yu-Hsuan Chang; Yi-Wei Liu

    Quantum tunnelling is a phenomenon of non-equilibrium quantum dynamics and its detailed process is largely unexplored. We report the experimental observation of macroscopic quantum tunnelling of Bose–Einstein condensate in a hybrid trap. By exerting a non-adiabatic kick to excite a collective rotation mode of the trapped condensate, a periodic pulse train, which remains as condensate, is then out-coupled

  • Quantum scars of bosons with correlated hopping
    Commun. Phys. (IF 4.684) Pub Date : 2020-06-01
    Ana Hudomal; Ivana Vasić; Nicolas Regnault; Zlatko Papić

    Recent experiments on Rydberg atom arrays have found evidence of anomalously slow thermalization and persistent density oscillations, which have been interpreted as a many-body analog of the phenomenon of quantum scars. Periodic dynamics and atypical scarred eigenstates originate from a “hard” kinetic constraint: the neighboring Rydberg atoms cannot be simultaneously excited. Here we propose a realization

  • SrNbO 3 as a transparent conductor in the visible and ultraviolet spectra
    Commun. Phys. (IF 4.684) Pub Date : 2020-06-01
    Yoonsang Park; Joseph Roth; Daichi Oka; Yasushi Hirose; Tetsuya Hasegawa; Arpita Paul; Alexej Pogrebnyakov; Venkatraman Gopalan; Turan Birol; Roman Engel-Herbert

    Few materials have been identified as high-performance transparent conductors in the visible regime (400–700 nm). Even fewer conductors are known to be transparent in ultraviolet (UV) spectrum, especially at wavelengths below 320 nm. Doped wide-bandgap semiconductors employed currently as UV transparent conductors have insufficient electrical conductivities, posing a significant challenge for achieving

  • Entanglement growth in diffusive systems
    Commun. Phys. (IF 4.684) Pub Date : 2020-06-01
    Marko Žnidarič

    Entanglement helps in understanding diverse phenomena, going from quantifying complexity to classifying phases of matter. Here we study the influence of conservation laws on entanglement growth. Focusing on systems with U(1) symmetry, i.e., conservation of charge or magnetization, that exhibits diffusive dynamics, we theoretically predict the growth of entanglement, as quantified by the Rényi entropy

  • Nature of the spin resonance mode in CeCoIn 5
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-29
    Yu Song; Weiyi Wang; John S. Van Dyke; Naveen Pouse; Sheng Ran; Duygu Yazici; A. Schneidewind; Petr Čermák; Y. Qiu; M. B. Maple; Dirk K. Morr; Pengcheng Dai

    Spin-fluctuation-mediated unconventional superconductivity can emerge at the border of magnetism, featuring a superconducting order parameter that changes sign in momentum space. Detection of such a sign-change is experimentally challenging, since most probes are not phase-sensitive. The observation of a spin resonance mode (SRM) from inelastic neutron scattering is often seen as strong phase-sensitive

  • Megahertz single-particle imaging at the European XFEL
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-29
    Egor Sobolev; Sergei Zolotarev; Klaus Giewekemeyer; Johan Bielecki; Kenta Okamoto; Hemanth K. N. Reddy; Jakob Andreasson; Kartik Ayyer; Imrich Barak; Sadia Bari; Anton Barty; Richard Bean; Sergey Bobkov; Henry N. Chapman; Grzegorz Chojnowski; Benedikt J. Daurer; Katerina Dörner; Tomas Ekeberg; Leonie Flückiger; Oxana Galzitskaya; Luca Gelisio; Steffen Hauf; Brenda G. Hogue; Daniel A. Horke; Ahmad Hosseinizadeh;

    The emergence of high repetition-rate X-ray free-electron lasers (XFELs) powered by superconducting accelerator technology enables the measurement of significantly more experimental data per day than was previously possible. The European XFEL is expected to provide 27,000 pulses per second, over two orders of magnitude more than any other XFEL. The increased pulse rate is a key enabling factor for

  • Supercooled water confined in a metal-organic framework
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-26
    Jonas K. H. Fischer; Pit Sippel; Dmytro Denysenko; Peter Lunkenheimer; Dirk Volkmer; Alois Loidl

    Within the so-called “no-man’s land” between about 150 and 235 K, crystallization of bulk water is inevitable. The glass-like freezing and a liquid-to-liquid transition of water, predicted to occur in this region, can be investigated by confining water in nanometer-sized pores. Here, we report the molecular dynamics of water within the pores of a metal-organic framework using dielectric spectroscopy

  • Asymmetric Fermi velocity induced chiral magnetotransport anisotropy in the type-II Dirac semi-metal PtSe 2
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-25
    Jian Sun; Russell S. Deacon; Wenchen Luo; Yahua Yuan; Xiaochi Liu; Haipeng Xie; Yongli Gao; Koji Ishibashi

    PtSe2 is a recently discovered type-II Dirac semi-metal with heavily tilted Dirac cone in z-direction of the momentum. Negative magnetoresistance (MR) is expected as a signature of the chiral anomaly in the x–y plane where Lorentz invariance is maintained. Here we report the observation of negative MR in PtSe2 thin flakes with magnetic fields aligned parallel to the current path and crystal a-axis

  • Remote detection and recording of atomic-scale spin dynamics
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-25
    R. J. G. Elbertse; D. Coffey; J. Gobeil; A. F. Otte

    Atomic spin structures assembled by means of scanning tunneling microscopy (STM) provide valuable insight into the understanding of atomic-scale magnetism. Among the major challenges are the detection and subsequent read-out of ultrafast spin dynamics due to a dichotomy in travel speed of these dynamics and the probe tip. Here, we present a device composed of individual Fe atoms that allows for remote

  • Celebrating 60 years of laser
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-22

    This month marks the 60th anniversary of the invention of the laser. Here, we highlight a few of the many developments of a technology that has revolutionised our lives. To celebrate, our editors have chosen a collection of articles published in Communications Physics that showcase the breath of research and applications in this field.

  • High efficiency ultrafast water-window harmonic generation for single-shot soft X-ray spectroscopy
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-22
    Yuxi Fu; Kotaro Nishimura; Renzhi Shao; Akira Suda; Katsumi Midorikawa; Pengfei Lan; Eiji J. Takahashi

    Fully coherent, soft X-ray attosecond pulses are now available through high-order harmonic generation (HHG); however, the output energy is insufficient for various applications, such as attosecond-scale soft X-ray nonlinear experiments, the seeding of soft X-ray free-electron lasers, attosecond-pump-attosecond-probe spectroscopies, and single-shot imaging. In this paper, we combine a newly developed

  • One-dimensional photonic bound states in the continuum
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-21
    P. S. Pankin; B.-R. Wu; J.-H. Yang; K.-P. Chen; I. V. Timofeev; A. F. Sadreev

    In 1985 Fridriech and Wintgen proposed a mechanism for bound states in the continuum based on full destructive interference of two resonances which can be easily applied to the two- and three-dimensional wave systems. Here we explicitly show that this mechanism can be realized in one-dimensional quantum potential well, owing to destructive interference of electron paths with different spin in tilted

  • Universal layer number in graphite
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-20
    K. Sasaki; K. Hitachi

    Graphene absorbs light in accordance with the fine-structure constant α ≃ 1/137. The α value is universal in the sense that it is unrelated to material parameters but solely related to the elementary charge, which is a fundamental constant governing the coupling of light and matter. A new universality governed only by α has yet to be discovered in graphene optics. However, since α is a dimensionless

  • Energetic footprints of irreversibility in the quantum regime
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-19
    M. H. Mohammady; A. Auffèves; J. Anders

    In classical thermodynamic processes the unavoidable presence of irreversibility, quantified by the entropy production, carries two energetic footprints: the reduction of extractable work from the optimal, reversible case, and the generation of a surplus of heat that is irreversibly dissipated to the environment. Recently it has been shown that in the quantum regime an additional quantum irreversibility

  • Bridging the gap between graphs and networks
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-15
    Gerardo Iñiguez; Federico Battiston; Márton Karsai

    Network science has become a powerful tool to describe the structure and dynamics of real-world complex physical, biological, social, and technological systems. Largely built on empirical observations to tackle heterogeneous, temporal, and adaptive patterns of interactions, its intuitive and flexible nature has contributed to the popularity of the field. With pioneering work on the evolution of random

  • Exploiting symmetry in network analysis
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-15
    Rubén J. Sánchez-García

    Virtually all network analyses involve structural measures between pairs of vertices, or of the vertices themselves, and the large amount of symmetry present in real-world complex networks is inherited by such measures. This has practical consequences that have not yet been explored in full generality, nor systematically exploited by network practitioners. Here we study the effect of network symmetry

  • A substantial hybridization between correlated Ni- d orbital and itinerant electrons in infinite-layer nickelates
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-14
    Yuhao Gu; Sichen Zhu; Xiaoxuan Wang; Jiangping Hu; Hanghui Chen

    The discovery of unconventional superconductivity in hole doped NdNiO2, similar to CaCuO2, has received enormous attention. However, different from CaCuO2, RNiO2 (R = Nd, La) has itinerant electrons in the rare-earth spacer layer. Previous studies show that the hybridization between Ni-\({d}_{{x}^{2}-{y}^{2}}\) and rare-earth-d orbitals is very weak and thus RNiO2 is still a promising analog of CaCuO2

  • Correcting the formalism governing Bloch Surface Waves excited by 3D Gaussian beams
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-14
    Fadi I. Baida; Maria-Pilar Bernal

    Due to the growing number of publications and applications based on the exploitation of Bloch Surface Waves and the numerous errors and approximations that are used to evaluate their properties, we judge important for the successful interpretation and understanding of experiments to implement an adapted formalism allowing to extract the relevant information. Through comprehensive calculations supported

  • Author Correction: 20 years of developments in optical frequency comb technology and applications
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-11
    Tara Fortier; Esther Baumann

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

  • The role of bot squads in the political propaganda on Twitter
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-11
    Guido Caldarelli; Rocco De Nicola; Fabio Del Vigna; Marinella Petrocchi; Fabio Saracco

    Nowadays, Social Media are a privileged channel for news spreading, information exchange, and fact checking. Unexpectedly for many users, automated accounts, known as social bots, contribute more and more to this process of information diffusion. Using Twitter as a benchmark, we consider the traffic exchanged, over one month of observation, on the migration flux from Northern Africa to Italy. We measure

  • Atomic-scale control of tunneling in donor-based devices
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-11
    Xiqiao Wang; Jonathan Wyrick; Ranjit V. Kashid; Pradeep Namboodiri; Scott W. Schmucker; Andrew Murphy; M. D. Stewart; Richard M. Silver

    Atomically precise donor-based quantum devices are a promising candidate for solid-state quantum computing and analog quantum simulations. However, critical challenges in atomically precise fabrication have meant systematic, atomic scale control of the tunneling rates and tunnel coupling has not been demonstrated. Here using a room temperature grown locking layer and precise control over the entire

  • Phase diagram of the two-dimensional Hubbard-Holstein model
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-08
    Natanael C. Costa; Kazuhiro Seki; Seiji Yunoki; Sandro Sorella

    The electron–electron and electron–phonon interactions play an important role in correlated materials, being key features for spin, charge and pair correlations. Thus, here we investigate their effects in strongly correlated systems by performing unbiased quantum Monte Carlo simulations in the square lattice Hubbard-Holstein model at half-filling. We study the competition and interplay between antiferromagnetism

  • Mimicking bio-mechanical principles in photonic metamaterials for giant broadband nonlinearity
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-08
    Taeyong Chang; Suwan Jeon; Minsung Heo; Jonghwa Shin

    Microscopic structuring can change the effective properties of a material by several orders of magnitude. An example of this is animal bone, which has an effective elastic modulus that is more than 1,000 times larger than that of the constituent proteins. Here, we propose a broadband-enhancement principle of photonic nonlinearity that has a similar mathematical origin as the bone example. The proposed

  • A framework for glass-box physics rule learner and its application to nano-scale phenomena
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-08
    In Ho Cho; Qiang Li; Rana Biswas; Jaeyoun Kim

    Attempts to use machine learning to discover hidden physical rules are in their infancy, and such attempts confront more challenges when experiments involve multifaceted measurements over three-dimensional objects. Here we propose a framework that can infuse scientists’ basic knowledge into a glass-box rule learner to extract hidden physical rules behind complex physics phenomena. A “convolved information

  • Author Correction: The nature of ferromagnetism in the chiral helimagnet Cr 1/3 NbS 2
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-07
    N. Sirica; P. Vilmercati; F. Bondino; I. Pis; S. Nappini; S. -K. Mo; A. V. Fedorov; P. K. Das; I. Vobornik; J. Fujii; L. Li; D. Sapkota; D. S. Parker; D. G. Mandrus; N. Mannella

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

  • Sign changing pairing in single layer FeSe/SrTiO 3 revealed by nonmagnetic impurity bound states
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-07
    Huimin Zhang; Zhuozhi Ge; Michael Weinert; Lian Li

    The discovery of high-temperature superconductivity in single layer FeSe epitaxially grown on SrTiO3(001) substrates has instigated extensive debate over whether its pairing symmetry is conventional sign-preserving s-wave or unconventional sign-changing. Here, we probe the pairing state for single layer FeSe/SrTiO3 grown by molecular beam epitaxy using scanning tunneling microscopy/spectroscopy. We

  • Organizing bacterial vortex lattices by periodic obstacle arrays
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-07
    Henning Reinken; Daiki Nishiguchi; Sebastian Heidenreich; Andrey Sokolov; Markus Bär; Sabine H. L. Klapp; Igor S. Aranson

    Recent experiments have shown that the complex spatio-temporal vortex structures emerging in active fluids are susceptible to weak geometrical constraints. This observation poses the fundamental question of how boundary effects stabilize a highly ordered pattern from seemingly turbulent motion. Here we show, by a combination of continuum theory and experiments on a bacterial suspension, how artificial

  • Autonomous molecular design by Monte-Carlo tree search and rapid evaluations using molecular dynamics simulations
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-07
    Seiji Kajita; Tomoyuki Kinjo; Tomoki Nishi

    Functional materials, especially those that largely differ from known materials, are not easily discoverable because both human experts and supervised machine learning need prior knowledge and datasets. An autonomous system can evaluate various properties a priori, and thereby explore unknown extrapolation spaces in high-throughput simulations. However, high-throughput evaluations of molecular dynamics

  • Ultrafast dynamics of exchange stiffness in Co/Pt multilayer
    Commun. Phys. (IF 4.684) Pub Date : 2020-05-06
    Je-Ho Shim; Akbar Ali Syed; Yooleemi Shin; Ji-Wan Kim; Hong-Guang Piao; Sang-Hyuk Lee; Kyung Min Lee; Jong-Ryul Jeong; Dong-Hyun Kim; Dong Eon Kim

    The exchange stiffness coefficient, Aex, represents the strength of direct exchange interactions among neighboring spins. Aex is linked to most of the magnetic properties such as skyrmion formation, magnetic vortex, magnetic domain wall width, and exchange length. Hence, the quantification of Aex is essential to understanding fundamental magnetic properties, but little is known for the dynamics of

  • Topoelectrical circuit realization of a Weyl semimetal heterojunction
    Commun. Phys. (IF 4.684) Pub Date : 2020-04-30
    S. M. Rafi-Ul-Islam; Zhuo Bin Siu; Mansoor B. A. Jalil

    Weyl semimetals (WSMs) are a recent addition to the family of topological materials, and the physical realization of heterojunctions between different types of WSMs is challenging. Here, we use electrical components to create topoelectrical (TE) circuits for modeling and studying the transmission across heterojunctions, consisting of a Type I WSM source to a drain in the Type II or intermediary Type

  • Light soaking in metal halide perovskites studied via steady-state microwave conductivity
    Commun. Phys. (IF 4.684) Pub Date : 2020-04-30
    C Lowell Watts; Lee Aspitarte; Yen-Hung Lin; Wen Li; Radwan Elzein; Rafik Addou; Min Ji Hong; Gregory S. Herman; Henry J. Snaith; John G. Labram

    The light-soaking effect is the observation that under constant illumination the measured power conversion efficiency of certain solar cells changes as a function of time. The theory of the light-soaking in metal halide perovskites is at present incomplete. In this report, we employ steady-state microwave conductivity, a contactless probe of electronic properties of semiconductors, to study the light-soaking

  • Electrostatic superlattices on scaled graphene lattices
    Commun. Phys. (IF 4.684) Pub Date : 2020-04-28
    Szu-Chao Chen; Rainer Kraft; Romain Danneau; Klaus Richter; Ming-Hao Liu

    Electrostatic superlattices have been known to significantly modify the electronic structure of low-dimensional materials. Studies of graphene superlattices were triggered by the discovery of moiré patterns in van der Waals stacks of graphene and hexagonal boron nitride (hBN) layers a few years ago. Very recently, gate-controllable superlattices using spatially modulated gate oxides have been achieved

  • Enhancement of chemical oscillations by self-generated convective flows
    Commun. Phys. (IF 4.684) Pub Date : 2020-04-27
    Oleg E. Shklyaev; Victor V. Yashin; Samuel I. Stupp; Anna C. Balazs

    Chemical feedback loops in fluids can produce not only chemical oscillations, but also density variations that generate solutal buoyancy forces, which in turn initiate fluid flow. Using analytical and computational models, we herein examine how the reaction-induced flows alter the chemical oscillations in a fluid-filled chamber whose top and bottom walls are coated with different enzymes. Due to this

  • Condensed matter in a new light
    Commun. Phys. (IF 4.684) Pub Date : 2020-04-20
    Daniel T. Payne
  • The nature of ferromagnetism in the chiral helimagnet Cr 1/3 NbS 2
    Commun. Phys. (IF 4.684) Pub Date : 2020-04-03
    N. Sirica; P. Vilmercati; F. Bondino; I. Pis; S. Nappini; S. -K. Mo; A. V. Fedorov; P. K. Das; I. Vobornik; J. Fujii; L. Li; D. Sapkota; D. S. Parker; D. G. Mandrus; N. Mannella
  • A phase diagram for bacterial swarming
    Commun. Phys. (IF 4.684) Pub Date : 2020-04-03
    Avraham Be’er; Bella Ilkanaiv; Renan Gross; Daniel B. Kearns; Sebastian Heidenreich; Markus Bär; Gil Ariel
  • Nonreciprocal Landau–Zener tunneling
    Commun. Phys. (IF 4.684) Pub Date : 2020-04-02
    Sota Kitamura; Naoto Nagaosa; Takahiro Morimoto
  • Electron-polaron dichotomy of charge carriers in perovskite oxides
    Commun. Phys. (IF 4.684) Pub Date : 2020-04-02
    M.-A. Husanu; L. Vistoli; C. Verdi; A. Sander; V. Garcia; J. Rault; F. Bisti; L. L. Lev; T. Schmitt; F. Giustino; A. S. Mishchenko; M. Bibes; V. N. Strocov
  • Moving flux quanta cool superconductors by a microwave breath
    Commun. Phys. (IF 4.684) Pub Date : 2020-04-02
    O. V. Dobrovolskiy; C. González-Ruano; A. Lara; R. Sachser; V. M. Bevz; V. A. Shklovskij; A. I. Bezuglyj; R. V. Vovk; M. Huth; F. G. Aliev
  • Flipping the helicity of X-rays from an undulator at unprecedented speed
    Commun. Phys. (IF 4.684) Pub Date : 2020-04-01
    Karsten Holldack; Christian Schüssler-Langeheine; Paul Goslawski; Niko Pontius; Torsten Kachel; Felix Armborst; Markus Ries; Andreas Schälicke; Michael Scheer; Winfried Frentrup; Johannes Bahrdt
  • Author Correction: Dissecting the properties of neutron star–black hole mergers originating in dense star clusters
    Commun. Phys. (IF 4.684) Pub Date : 2020-03-31
    Manuel Arca Sedda

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

  • A fully planar solar pumped laser based on a luminescent solar collector
    Commun. Phys. (IF 4.684) Pub Date : 2020-03-27
    Taizo Masuda; Mitsuhiro Iyoda; Yuta Yasumatsu; Stephan Dottermusch; Ian A. Howard; Bryce S. Richards; Jean-Francois Bisson; Masamori Endo
  • In-plane selective area InSb–Al nanowire quantum networks
    Commun. Phys. (IF 4.684) Pub Date : 2020-03-26
    Roy L. M. Op het Veld; Di Xu; Vanessa Schaller; Marcel A. Verheijen; Stan M. E. Peters; Jason Jung; Chuyao Tong; Qingzhen Wang; Michiel W. A. de Moor; Bart Hesselmann; Kiefer Vermeulen; Jouri D. S. Bommer; Joon Sue Lee; Andrey Sarikov; Mihir Pendharkar; Anna Marzegalli; Sebastian Koelling; Leo P. Kouwenhoven; Leo Miglio; Chris J. Palmstrøm; Hao Zhang; Erik P. A. M. Bakkers
  • Universal flux patterns and their interchange in superconductors between types I and II
    Commun. Phys. (IF 4.684) Pub Date : 2020-03-25
    A. Vagov; S. Wolf; M. D. Croitoru; A. A. Shanenko
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