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  • An odd couple
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-21
    Brian D’Urso; James Millen

    An atomic spin oscillator coupled to a mechanical membrane resonator forms an effective negative-mass oscillator. Entanglement in this hybrid quantum system is created by a backaction-evading position measurement, despite the macroscopic separation.

    更新日期:2020-09-21
  • The symmetry of superconducting Sr 2 RuO 4
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-21
    Daniel F. Agterberg

    Ultrasound experiments reveal a multicomponent superconducting order parameter in Sr2RuO4.

    更新日期:2020-09-21
  • Ultrasound evidence for a two-component superconducting order parameter in Sr 2 RuO 4
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-21
    S. Benhabib; C. Lupien; I. Paul; L. Berges; M. Dion; M. Nardone; A. Zitouni; Z. Q. Mao; Y. Maeno; A. Georges; L. Taillefer; C. Proust

    The quasi-two-dimensional metal Sr2RuO4 is one of the best characterized unconventional superconductors, yet the nature of its superconducting order parameter is still under debate1,2,3. This information is crucial to determine the pairing mechanism of Cooper pairs. Here we use ultrasound velocity to probe the superconducting state of Sr2RuO4. This thermodynamic probe is sensitive to the symmetry of

    更新日期:2020-09-21
  • Thermodynamic evidence for a two-component superconducting order parameter in Sr 2 RuO 4
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-21
    Sayak Ghosh; Arkady Shekhter; F. Jerzembeck; N. Kikugawa; Dmitry A. Sokolov; Manuel Brando; A. P. Mackenzie; Clifford W. Hicks; B. J. Ramshaw

    Sr2RuO4 has stood as the leading candidate for a spin-triplet superconductor for 26 years1. However, recent NMR experiments have cast doubt on this candidacy2,3 and it is difficult to find a theory of superconductivity that is consistent with all experiments. The order parameter symmetry for this material therefore remains an open question. Symmetry-based experiments are needed that can rule out broad

    更新日期:2020-09-21
  • Entanglement between distant macroscopic mechanical and spin systems
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-21
    Rodrigo A. Thomas; Michał Parniak; Christoffer Østfeldt; Christoffer B. Møller; Christian Bærentsen; Yeghishe Tsaturyan; Albert Schliesser; Jürgen Appel; Emil Zeuthen; Eugene S. Polzik

    Entanglement is an essential property of multipartite quantum systems, characterized by the inseparability of quantum states of objects regardless of their spatial separation. Generation of entanglement between increasingly macroscopic and disparate systems is an ongoing effort in quantum science, as it enables hybrid quantum networks, quantum-enhanced sensing and probing of the fundamental limits

    更新日期:2020-09-21
  • Machine learning the thermodynamic arrow of time
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-21
    Alireza Seif; Mohammad Hafezi; Christopher Jarzynski

    The asymmetry in the flow of events that is expressed by the phrase ‘time’s arrow’ traces back to the second law of thermodynamics. In the microscopic regime, fluctuations prevent us from discerning the direction of time’s arrow with certainty. Here, we find that a machine learning algorithm that is trained to infer the direction of time’s arrow identifies entropy production as the relevant physical

    更新日期:2020-09-21
  • Observation of energy-resolved many-body localization
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-21
    Qiujiang Guo; Chen Cheng; Zheng-Hang Sun; Zixuan Song; Hekang Li; Zhen Wang; Wenhui Ren; Hang Dong; Dongning Zheng; Yu-Ran Zhang; Rubem Mondaini; Heng Fan; H. Wang

    Many-body localization (MBL) describes a quantum phase where an isolated interacting system subject to sufficient disorder displays non-ergodic behaviour, evading thermal equilibrium that occurs under its own dynamics. Previously, the thermalization–MBL transition has been largely characterized with the growth of disorder. Here, we explore a new axis, reporting on an energy-resolved MBL transition

    更新日期:2020-09-21
  • Morphology selection kinetics of crystallization in a sphere
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-21
    Yanshuang Chen; Zhenwei Yao; Shixiang Tang; Hua Tong; Taiki Yanagishima; Hajime Tanaka; Peng Tan

    Crystallization under geometrical confinement is of fundamental importance in condensed matter physics, biophysics and material science. Even the influence of the simplest geometry, a sphere, on crystallization remains far from well understood, thereby making morphology control of the final superstructures challenging. Here, we employ charged colloids encapsulated in an emulsion droplet as a model

    更新日期:2020-09-21
  • Time–information uncertainty relations in thermodynamics
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-21
    Schuyler B. Nicholson; Luis Pedro García-Pintos; Adolfo del Campo; Jason R. Green

    Physical systems powering motion and creating structure in a fixed amount of time dissipate energy and produce entropy. Whether living, synthetic or engineered, systems performing these dynamic functions must balance dissipation and speed. Here, we show that rates of energy and entropy exchange are subject to a speed limit—a time–information uncertainty relation—imposed by the rates of change in the

    更新日期:2020-09-21
  • Generalized superradiance for producing broadband coherent radiation with transversely modulated arbitrarily diluted bunches
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-14
    J. Vieira; M. Pardal; J. T. Mendonça; R. A. Fonseca

    Superradiance is the anomalous radiance describing coherent photon emission from a gas. It plays a crucial role in atomic physics, quantum mechanics and astrophysics. Because the intensity of superradiant light beams is proportional to the number of particles squared, superradiance is also at the core of today’s most powerful light sources. Superradiant emission is intuitively expected when the distance

    更新日期:2020-09-14
  • Weak-to-strong transition of quantum measurement in a trapped-ion system
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-14
    Yiming Pan; Jie Zhang; Eliahu Cohen; Chun-wang Wu; Ping-Xing Chen; Nir Davidson

    Quantum measurement remains a puzzle through its stormy history from the birth of quantum mechanics to state-of-the-art quantum technologies. Two complementary measurement schemes have been widely investigated in a variety of quantum systems: von Neumann’s projective ‘strong’ measurement and Aharonov’s weak measurement. Here, we report the observation of a weak-to-strong measurement transition in a

    更新日期:2020-09-14
  • Symmetry breaking in twisted double bilayer graphene
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-14
    Minhao He; Yuhao Li; Jiaqi Cai; Yang Liu; K. Watanabe; T. Taniguchi; Xiaodong Xu; Matthew Yankowitz

    The flat bands that appear in some twisted van der Waals heterostructures provide a setting in which strong interactions between electrons lead to a variety of correlated phases1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20. In particular, heterostructures of twisted double bilayer graphene host correlated insulating states that can be tuned by both the twist angle and an external electric field11

    更新日期:2020-09-14
  • Chemotaxis under flow disorder shapes microbial dispersion in porous media
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-14
    Pietro de Anna; Amir A. Pahlavan; Yutaka Yawata; Roman Stocker; Ruben Juanes

    Natural soils are host to a high density1 and diversity2 of microorganisms, and even deep-earth porous rocks provide a habitat for active microbial communities3. In these environments, microbial transport by disordered flows is relevant for a broad range of natural and engineered processes, from biochemical cycling to remineralization and bioremediation4,5,6,7. Yet, how bacteria are transported and

    更新日期:2020-09-14
  • A massive test
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-07
    M. S. Kim

    Although quantum mechanics is essential to understand microscopic systems, it has little effect on heavier objects. Experiments have now put strict constraints on theories that use gravity to explain the absence of large-scale quantum effects.

    更新日期:2020-09-08
  • Underground test of gravity-related wave function collapse
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-07
    Sandro Donadi; Kristian Piscicchia; Catalina Curceanu; Lajos Diósi; Matthias Laubenstein; Angelo Bassi

    Roger Penrose proposed that a spatial quantum superposition collapses as a back-reaction from spacetime, which is curved in different ways by each branch of the superposition. In this sense, one speaks of gravity-related wave function collapse. He also provided a heuristic formula to compute the decay time of the superposition—similar to that suggested earlier by Lajos Diósi, hence the name Diósi–Penrose

    更新日期:2020-09-08
  • Black metal hydrogen above 360 GPa driven by proton quantum fluctuations
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-07
    Lorenzo Monacelli; Ion Errea; Matteo Calandra; Francesco Mauri

    Hydrogen metallization under stable conditions is a substantial step towards the realization of the first room-temperature superconductor. Recent low-temperature experiments1,2,3 report different metallization pressures, ranging from 360 GPa to 490 GPa. In this work, we simulate the structural properties and vibrational Raman, infrared and optical spectra of hydrogen phase III, accounting for proton

    更新日期:2020-09-08
  • Structure determines where crystallization occurs in a soft colloidal glass
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-07
    Divya Ganapathi; Dibyashree Chakrabarti; A. K. Sood; Rajesh Ganapathy

    Glass is inherently unstable to crystallization. However, how this transformation occurs while the dynamics in the glass stay frozen at the particle scale is poorly understood. Here, through single-particle-resolved imaging experiments, we show that due to frozen-in density inhomogeneities, a soft colloidal glass crystallizes via two distinct pathways. In the poorly packed regions of the glass, crystallinity

    更新日期:2020-09-08
  • Zero-bias peaks at zero magnetic field in ferromagnetic hybrid nanowires
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-07
    S. Vaitiekėnas; Y. Liu; P. Krogstrup; C. M. Marcus

    Hybrid quantum materials allow for quantum phases that otherwise do not exist in nature1,2. For example, a one-dimensional topological superconductor with Majorana states bound to its ends can be realized by coupling a semiconductor nanowire to a superconductor in the presence of a strong magnetic field3,4,5. However, the applied magnetic fields are detrimental to superconductivity, and constrain device

    更新日期:2020-09-08
  • Braided anyons
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-03
    Rui-Rui Du

    The properties of anyons — two-dimensional particles that are neither fermions nor bosons — have been directly measured in a quantum Hall interferometer.

    更新日期:2020-09-03
  • Direct observation of anyonic braiding statistics
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-03
    J. Nakamura; S. Liang; G. C. Gardner; M. J. Manfra

    Anyons are quasiparticles that, unlike fermions and bosons, show fractional statistics when two of them are exchanged. Here, we report the experimental observation of anyonic braiding statistics for the ν = 1/3 fractional quantum Hall state by using an electronic Fabry–Perot interferometer. Strong Aharonov–Bohm interference of the edge mode is punctuated by discrete phase slips that indicate an anyonic

    更新日期:2020-09-03
  • Braiding photonic topological zero modes
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-03
    Jiho Noh; Thomas Schuster; Thomas Iadecola; Sheng Huang; Mohan Wang; Kevin P. Chen; Claudio Chamon; Mikael C. Rechtsman

    A remarkable property of quantum mechanics in two-dimensional space is its ability to support ‘anyons’, particles that are neither fermions nor bosons. Theory predicts that these exotic excitations can exist as bound states confined near topological defects, such as Majorana zero modes trapped in vortices in topological superconductors. Intriguingly, in the simplest cases the non-trivial phase that

    更新日期:2020-09-03
  • Just a moment
    Nat. Phys. (IF 19.256) Pub Date : 2020-09-03
    Davide Castelvecchi

    Wolfgang Pauli introduced the Bohr magneton as a fundamental unit of magnetic moment during an effort to find a quantum basis for magnetism, as Davide Castelvecchi recounts.

    更新日期:2020-09-03
  • Inside ITER
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-31
    Stefanie Reichert

    The First Plasma discharge in the ITER tokamak is expected for 2025 with deuterium–tritium plasma operation ten years later. We spoke with ITER’s Director-General, Bernard Bigot, and Tim Luce, head of ITER’s Science & Operations Department, about the current status of the project and potential future directions in fusion research.

    更新日期:2020-08-31
  • Thermodynamics of a deeply degenerate SU( N )-symmetric Fermi gas
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-31
    Lindsay Sonderhouse; Christian Sanner; Ross B. Hutson; Akihisa Goban; Thomas Bilitewski; Lingfeng Yan; William R. Milner; Ana M. Rey; Jun Ye

    Many-body quantum systems can exhibit a striking degree of symmetry unparallelled in their classical counterparts. In real materials SU(N) symmetry is an idealization, but this symmetry is pristinely realized in fully controllable ultracold alkaline-earth atomic gases. Here, we study an SU(N)-symmetric Fermi liquid of 87Sr atoms, where N can be tuned to be as large as 10. In the deeply degenerate regime

    更新日期:2020-08-31
  • Spectroscopic fingerprint of charge order melting driven by quantum fluctuations in a cuprate
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-31
    W. S. Lee; Ke-Jin J. Zhou; M. Hepting; J. Li; A. Nag; A. C. Walters; M. Garcia-Fernandez; H. C. Robarts; M. Hashimoto; H. Lu; B. Nosarzewski; D. Song; H. Eisaki; Z. X. Shen; B. Moritz; J. Zaanen; T. P. Devereaux

    Copper oxide high-TC superconductors possess a number of exotic orders that coexist with or are proximal to superconductivity. Quantum fluctuations associated with these orders may account for the unusual characteristics of the normal state, and possibly affect the superconductivity1,2,3,4. Yet, spectroscopic evidence for such quantum fluctuations remains elusive. Here, we use resonant inelastic X-ray

    更新日期:2020-08-31
  • Binary icosahedral clusters of hard spheres in spherical confinement
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-31
    Da Wang; Tonnishtha Dasgupta; Ernest B. van der Wee; Daniele Zanaga; Thomas Altantzis; Yaoting Wu; Gabriele M. Coli; Christopher B. Murray; Sara Bals; Marjolein Dijkstra; Alfons van Blaaderen

    The influence of geometry on the local and global packing of particles is important to many fundamental and applied research themes, such as the structure and stability of liquids, crystals and glasses. Here we show by experiments and simulations that a binary mixture of hard-sphere-like nanoparticles crystallizing into a MgZn2 Laves phase in bulk spontaneously forms icosahedral clusters in slowly

    更新日期:2020-08-31
  • The way ahead for fusion
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-28

    As the construction of the ITER tokamak enters its next phase — the machine assembly — now is a good time for a recap of the history and current status of nuclear fusion research.

    更新日期:2020-08-29
  • Controlling the speed and trajectory of evolution with counterdiabatic driving
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-24
    Shamreen Iram; Emily Dolson; Joshua Chiel; Julia Pelesko; Nikhil Krishnan; Özenç Güngör; Benjamin Kuznets-Speck; Sebastian Deffner; Efe Ilker; Jacob G. Scott; Michael Hinczewski

    The pace and unpredictability of evolution are critically relevant in a variety of modern challenges, such as combating drug resistance in pathogens and cancer, understanding how species respond to environmental perturbations like climate change and developing artificial selection approaches for agriculture. Great progress has been made in quantitative modelling of evolution using fitness landscapes

    更新日期:2020-08-24
  • Cooperative pattern formation in multi-component bacterial systems through reciprocal motility regulation
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-24
    A. I. Curatolo; N. Zhou; Y. Zhao; C. Liu; A. Daerr; J. Tailleur; J. Huang

    Self-organization is a prerequisite of biological complexity. At the population level, it amounts to spontaneously sorting different individuals through space and time. Here, we reveal a simple mechanism by which different populations of motile cells can self-organize through a reciprocal control of their motilities. We first show how the reciprocal activation of motility between two populations of

    更新日期:2020-08-24
  • Strong coupling and pressure engineering in WSe 2 –MoSe 2 heterobilayers
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-24
    Juan Xia; Jiaxu Yan; Zenghui Wang; Yongmin He; Yongji Gong; Weiqiang Chen; Tze Chien Sum; Zheng Liu; Pulickel M. Ajayan; Zexiang Shen

    Two-dimensional materials offer an exciting platform that enables the creation of van der Waals heterostructures with rich functions and intriguing physical properties that stem from different band alignments and diverse interlayer interactions. However, further exploration of two-dimensional van der Waals heterostructures is hindered by the limited coupling strength and lack of efficient methods for

    更新日期:2020-08-24
  • Excitons in a new light
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-17
    Meera M. Parish

    When a semiconductor is embedded inside a microcavity, infrared photons have been shown to bind electrons and holes together as excitons. This result opens the door for quantum material engineering based on light–matter interactions.

    更新日期:2020-08-17
  • Facts are relative
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-17
    Časlav Brukner

    The discussion of the quantum mechanical Wigner’s friend thought experiment has regained intensity. Recent theoretical results and experimental tests restrict the possibility of maintaining an observer-independent notion of measurement outcomes.

    更新日期:2020-08-17
  • Excitons bound by photon exchange
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-17
    Erika Cortese; Ngoc-Linh Tran; Jean-Michel Manceau; Adel Bousseksou; Iacopo Carusotto; Giorgio Biasiol; Raffaele Colombelli; Simone De Liberato

    In contrast to interband excitons in undoped quantum wells, doped quantum wells do not display sharp resonances due to excitonic bound states. The effective Coulomb interaction between electrons and holes in these systems typically leads to only a depolarization shift of the single-electron intersubband transitions1. Non-perturbative light–matter interaction in solid-state devices has been investigated

    更新日期:2020-08-17
  • A strong no-go theorem on the Wigner’s friend paradox
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-17
    Kok-Wei Bong; Aníbal Utreras-Alarcón; Farzad Ghafari; Yeong-Cherng Liang; Nora Tischler; Eric G. Cavalcanti; Geoff J. Pryde; Howard M. Wiseman

    Does quantum theory apply at all scales, including that of observers? New light on this fundamental question has recently been shed through a resurgence of interest in the long-standing Wigner’s friend paradox. This is a thought experiment addressing the quantum measurement problem—the difficulty of reconciling the (unitary, deterministic) evolution of isolated systems and the (non-unitary, probabilistic)

    更新日期:2020-08-17
  • Search for axion-like dark matter with ferromagnets
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-17
    Alexander V. Gramolin; Deniz Aybas; Dorian Johnson; Janos Adam; Alexander O. Sushkov

    Ultralight axion-like particles are well-motivated dark matter candidates, naturally emerging from theories of physics at ultrahigh energies. Here we report the results of a direct search for electromagnetic interactions of axion-like dark matter in the mass range that spans three decades from 12 peV to 12 neV. The detection scheme is based on a modification of Maxwell’s equations in the presence of

    更新日期:2020-08-17
  • Bloch ferromagnetism of composite fermions
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-17
    Md Shafayat Hossain; Tongzhou Zhao; Songyang Pu; M. A. Mueed; M. K. Ma; K. A. Villegas Rosales; Y. J. Chung; L. N. Pfeiffer; K. W. West; K. W. Baldwin; J. K. Jain; M. Shayegan

    In 1929, Felix Bloch suggested that the paramagnetic Fermi sea of electrons should make a spontaneous transition to a fully magnetized state at very low densities, because the exchange energy gained by aligning the spins exceeds the enhancement in the kinetic energy1. However, experimental realizations of this effect have been hard to implement. Here, we report the observation of an abrupt, interaction-driven

    更新日期:2020-08-17
  • High-temperature quantum anomalous Hall regime in a MnBi 2 Te 4 /Bi 2 Te 3 superlattice
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-17
    Haiming Deng; Zhiyi Chen; Agnieszka Wołoś; Marcin Konczykowski; Kamil Sobczak; Joanna Sitnicka; Irina V. Fedorchenko; Jolanta Borysiuk; Tristan Heider; Łukasz Pluciński; Kyungwha Park; Alexandru B. Georgescu; Jennifer Cano; Lia Krusin-Elbaum

    The quantum anomalous Hall effect1,2 is a fundamental transport response of a topological insulator in zero magnetic field. Its physical origin is a result of an intrinsically inverted electronic band structure and ferromagnetism3, and its most important manifestation is the dissipationless flow of chiral charge currents at the edges of the system4, a property that has the potential to transform future

    更新日期:2020-08-17
  • Author Correction: Experimental extraction of the quantum effective action for a non-equilibrium many-body system
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-12
    Maximilian Prüfer; Torsten V. Zache; Philipp Kunkel; Stefan Lannig; Alexis Bonnin; Helmut Strobel; Jürgen Berges; Markus K. Oberthaler

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

    更新日期:2020-08-12
  • Superconductivity and quantum criticality linked by the Hall effect in a strange metal
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-10
    Ian M. Hayes; Nikola Maksimovic; Gilbert N. Lopez; Mun K. Chan; B. J. Ramshaw; Ross D. McDonald; James G. Analytis

    Many unconventional superconductors exhibit a common set of anomalous charge transport properties that characterize them as ‘strange metals’, which provides hope that there is a single theory that describes them1,2,3. However, model-independent connections between the strange metals and superconductivity have remained elusive. Here, we show that the Hall effect of the unconventional superconductor

    更新日期:2020-08-10
  • Direct observation of two-dimensional magnons in atomically thin CrI 3
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-10
    John Cenker; Bevin Huang; Nishchay Suri; Pearl Thijssen; Aaron Miller; Tiancheng Song; Takashi Taniguchi; Kenji Watanabe; Michael A. McGuire; Di Xiao; Xiaodong Xu

    Magnons are collective spin excitations in crystals with long-range magnetic order. The emergent van der Waals magnets1,2,3 provide a highly tunable platform to explore magnetic excitations in the two-dimensional limit with intriguing properties, manifesting from their honeycomb lattice structure and switchable magnetic configurations. Here, we report the direct observation of two-dimensional magnons

    更新日期:2020-08-10
  • Efficient learning of quantum noise
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-10
    Robin Harper; Steven T. Flammia; Joel J. Wallman

    Noise is the central obstacle to building large-scale quantum computers. Quantum systems with sufficiently uncorrelated and weak noise could be used to solve computational problems that are intractable with current digital computers. There has been substantial progress towards engineering such systems1,2,3,4,5,6,7,8. However, continued progress depends on the ability to characterize quantum noise reliably

    更新日期:2020-08-10
  • Suppression of superconductivity by anisotropic strain near a nematic quantum critical point
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-10
    Paul Malinowski; Qianni Jiang; Joshua J. Sanchez; Joshua Mutch; Zhaoyu Liu; Preston Went; Jian Liu; Philip J. Ryan; Jong-Woo Kim; Jiun-Haw Chu

    In most unconventional and high-temperature superconductors, superconductivity emerges as a nearby symmetry-breaking phase is suppressed by chemical doping or pressure1,2,3,4,5,6,7. This has led to the belief that the fluctuations associated with the symmetry-breaking phase are beneficial, if not responsible, for the superconducting pairing8,9. A direct test to verify this hypothesis is to observe

    更新日期:2020-08-10
  • Active mucus–cilia hydrodynamic coupling drives self-organization of human bronchial epithelium
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-10
    Etienne Loiseau; Simon Gsell; Aude Nommick; Charline Jomard; Delphine Gras; Pascal Chanez; Umberto D’Ortona; Laurent Kodjabachian; Julien Favier; Annie Viallat

    The respiratory tract is protected by mucus, a complex fluid transported along the epithelial surface by the coordinated beating of millions of microscopic cilia, hence the name of mucociliary clearance. Its impairment is associated with all severe chronic respiratory diseases. Yet, the relationship between ciliary density and the spatial scale of mucus transport, as well as the mechanisms that drive

    更新日期:2020-08-10
  • Photon-pressure strong coupling between two superconducting circuits
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-10
    D. Bothner; I. C. Rodrigues; G. A. Steele

    The radiation-pressure coupling between two harmonic oscillators has been used in optomechanics for breakthrough experiments in the control and detection of mechanical displacement. Used primarily in optomechanics, there have been few reports of exploiting such a type of interaction in other platforms. Here, we engineer two superconducting LC circuits coupled by a strong photon-pressure interaction

    更新日期:2020-08-10
  • Universal scaling laws rule explosive growth in human cancers
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-10
    Víctor M. Pérez-García; Gabriel F. Calvo; Jesús J. Bosque; Odelaisy León-Triana; Juan Jiménez; Julián Pérez-Beteta; Juan Belmonte-Beitia; Manuel Valiente; Lucía Zhu; Pedro García-Gómez; Pilar Sánchez-Gómez; Esther Hernández-San Miguel; Rafael Hortigüela; Youness Azimzade; David Molina-García; Álvaro Martínez; Ángel Acosta Rojas; Ana Ortiz de Mendivil; Francois Vallette; Philippe Schucht; Michael Murek;

    Most physical and other natural systems are complex entities that are composed of a large number of interacting individual elements. It is a surprising fact that they often obey the so-called scaling laws that relate an observable quantity to a measure of the size of the system. Here, we describe the discovery of universal superlinear metabolic scaling laws in human cancers. This dependence underpins

    更新日期:2020-08-10
  • Black physicists matter
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-04

    The persistent under-representation of Black physicists is a systemic problem that requires will, money and long-term commitment to be solved.

    更新日期:2020-08-04
  • A spectral unit
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-04
    Giacomo Prando

    Giacomo Prando summarizes the troubled history of the radian, a unit with the odd property of appearing and disappearing seemingly at will in dimensional formulas.

    更新日期:2020-08-04
  • A scramble to preserve entanglement
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-03
    Andrew Forbes; Isaac Nape

    A mooted advantage of high-dimensional states is their robustness to noise, yet their fragility in noisy channels has hindered their deployment. A demonstration shows how to exploit entanglement to restore quantum correlations lost in transmission.

    更新日期:2020-08-03
  • Unscrambling entanglement through a complex medium
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-03
    Natalia Herrera Valencia; Suraj Goel; Will McCutcheon; Hugo Defienne; Mehul Malik

    The transfer of quantum information through a noisy environment is a central challenge in the fields of quantum communication, imaging and nanophotonics. In particular, high-dimensional quantum states of light enable quantum networks with significantly higher information capacities and noise robustness as compared with qubits. However, although qubit entanglement has been distributed over large distances

    更新日期:2020-08-03
  • Casimir spring and dilution in macroscopic cavity optomechanics
    Nat. Phys. (IF 19.256) Pub Date : 2020-08-03
    J. M. Pate; M. Goryachev; R. Y. Chiao; J. E. Sharping; M. E. Tobar

    The Casimir force was predicted in 1948 as a force arising between macroscopic bodies from the zero-point energy. At finite temperatures, it has been shown that a thermal Casimir force exists due to thermal rather than zero-point energy and there are a growing number of experiments that characterize the effect at a range of temperatures and distances. In addition, in the rapidly evolving field of cavity

    更新日期:2020-08-03
  • Carriers that count
    Nat. Phys. (IF 19.256) Pub Date : 2020-07-27
    Jan Zaanen

    An exactly solvable model for superconductivity includes two crucial features of the cuprates and sheds light on unexplained experiments.

    更新日期:2020-07-27
  • Exact theory for superconductivity in a doped Mott insulator
    Nat. Phys. (IF 19.256) Pub Date : 2020-07-27
    Philip W. Phillips; Luke Yeo; Edwin W. Huang

    Because the cuprate superconductors are doped Mott insulators, it would be advantageous to solve even a toy model that exhibits both Mottness and superconductivity. We consider the Hatsugai–Kohmoto model1,2, an exactly solvable system that is a prototypical Mott insulator. Upon either doping or reducing the interaction strength, our exact calculations show that the system becomes a non-Fermi liquid

    更新日期:2020-07-27
  • Tunnelling dynamics between superconducting bound states at the atomic limit
    Nat. Phys. (IF 19.256) Pub Date : 2020-07-27
    Haonan Huang; Ciprian Padurariu; Jacob Senkpiel; Robert Drost; Alfredo Levy Yeyati; Juan Carlos Cuevas; Björn Kubala; Joachim Ankerhold; Klaus Kern; Christian R. Ast

    There is a limit to the miniaturization of every process, and for charge transport this is realized by the coupling of two single discrete energy levels at the atomic scale. In superconductors, Yu–Shiba–Rusinov (YSR) states are such levels. Here, we place a magnetic impurity on the tip of a scanning tunnelling microscope (YSR-STM) and use it to demonstrate sequential tunnelling of electrons between

    更新日期:2020-07-27
  • Visualization of the flat electronic band in twisted bilayer graphene near the magic angle twist
    Nat. Phys. (IF 19.256) Pub Date : 2020-07-27
    M. Iqbal Bakti Utama; Roland J. Koch; Kyunghoon Lee; Nicolas Leconte; Hongyuan Li; Sihan Zhao; Lili Jiang; Jiayi Zhu; Kenji Watanabe; Takashi Taniguchi; Paul D. Ashby; Alexander Weber-Bargioni; Alex Zettl; Chris Jozwiak; Jeil Jung; Eli Rotenberg; Aaron Bostwick; Feng Wang

    Bilayer graphene has been predicted to host a moiré miniband with flat dispersion if the layers are stacked at specific twist angles known as the ’magic angles’1,2. Recently, twisted bilayer graphene (tBLG) with a magic angle twist was reported to exhibit a correlated insulating state and superconductivity3,4, where the presence of the flat miniband in the system is thought to be essential for the

    更新日期:2020-07-27
  • Resonant Andreev reflections probed by photon-assisted tunnelling at the atomic scale
    Nat. Phys. (IF 19.256) Pub Date : 2020-07-27
    Olof Peters; Nils Bogdanoff; Sergio Acero González; Larissa Melischek; J. Rika Simon; Gaël Reecht; Clemens B. Winkelmann; Felix von Oppen; Katharina J. Franke

    Tunnelling across superconducting junctions proceeds by a rich variety of processes, which transfer single electrons, Cooper pairs or even larger numbers of electrons by multiple Andreev reflections. Photon-assisted tunnelling combined with the venerable Tien–Gordon model has long been a powerful tool to identify tunnelling processes between superconductors. Here, we probe superconducting tunnel junctions

    更新日期:2020-07-27
  • Implementation of a canonical phase measurement with quantum feedback
    Nat. Phys. (IF 19.256) Pub Date : 2020-07-20
    Leigh S. Martin; William P. Livingston; Shay Hacohen-Gourgy; Howard M. Wiseman; Irfan Siddiqi

    Much of modern metrology and communication technology encodes information in electromagnetic waves, typically as an amplitude or phase. Although current hardware can perform near-ideal measurements of photon number or field amplitude, the ability to perform an ideal phase measurement is still lacking, even in principle. In this work, we implement a single-shot canonical phase measurement on a one-photon

    更新日期:2020-07-20
  • Photo-excitation of long-lived transient intermediates in ultracold reactions
    Nat. Phys. (IF 19.256) Pub Date : 2020-07-20
    Yu Liu; Ming-Guang Hu; Matthew A. Nichols; David D. Grimes; Tijs Karman; Hua Guo; Kang-Kuen Ni

    In many chemical reactions, the transformation from reactants to products is mediated by transient intermediate complexes. For gas-phase reactions involving molecules with a few atoms, these complexes typically live on the order of 10 ps or less before dissociating, and are therefore rarely influenced by external processes. Here, we demonstrate that the transient intermediate complex K2Rb2*, formed

    更新日期:2020-07-20
  • Chiral phonons in the pseudogap phase of cuprates
    Nat. Phys. (IF 19.256) Pub Date : 2020-07-20
    G. Grissonnanche; S. Thériault; A. Gourgout; M.-E. Boulanger; E. Lefrançois; A. Ataei; F. Laliberté; M. Dion; J.-S. Zhou; S. Pyon; T. Takayama; H. Takagi; N. Doiron-Leyraud; L. Taillefer

    The nature of the pseudogap phase of cuprates remains a major puzzle1,2. One of its signatures is a large negative thermal Hall conductivity3, whose origin is as yet unknown. This is observed even in the undoped Mott insulator La2CuO4, in which the charge carriers are localized and therefore cannot be responsible. Here, we show that the thermal Hall conductivity of La2CuO4 is roughly isotropic; that

    更新日期:2020-07-20
  • Publisher Correction: Universal elastic mechanism for stinger design
    Nat. Phys. (IF 19.256) Pub Date : 2020-07-15
    Kaare H. Jensen; Jan Knoblauch; Anneline H. Christensen; Katrine S. Haaning; Keunhwan Park

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

    更新日期:2020-07-15
  • Non-Abelian reciprocal braiding of Weyl points and its manifestation in ZrTe
    Nat. Phys. (IF 19.256) Pub Date : 2020-07-13
    Adrien Bouhon; QuanSheng Wu; Robert-Jan Slager; Hongming Weng; Oleg V. Yazyev; Tomáš Bzdušek

    Weyl semimetals in three-dimensional crystals provide the paradigm example of topologically protected band nodes. It is usually taken for granted that a pair of colliding Weyl points annihilate whenever they carry opposite chiral charge. In stark contrast, here we report that Weyl points in systems that are symmetric under the composition of time reversal with a π rotation are characterized by a non-Abelian

    更新日期:2020-07-13
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