Latest Research


Article 
Symmetryenforced chiral hinge states and surface quantum anomalous Hall effect in the magnetic axion insulator Bi_{2–x}Sm_{x}Se_{3}
The secondorder topological states—chiral hinge states—are predicted in axion insulators, ferromagnetic insulating materials with quantized electromagnetic response. The authors predict such states to occur in Smdoped Bi_{2}Se_{3}.
 Changming Yue
 , Yuanfeng Xu
 , Zhida Song
 , Hongming Weng
 , YuanMing Lu
 , Chen Fang
 & Xi Dai

Publisher Correction 
Publisher Correction: Stochastic nonlinear dynamics of confined cell migration in twostate systems
 David B. Brückner
 , Alexandra Fink
 , Christoph Schreiber
 , Peter J. F. Röttgermann
 , Joachim O. Rädler
 & Chase P. Broedersz

Article 
Actin dynamics drive celllike membrane deformation
The same type of polymer network deforms cell membranes inward, to absorb external material, and outward, to facilitate signal transmission. Experiments and theory show that these deformations are regulated by membrane tension and network mesh size.
 Camille Simon
 , Rémy Kusters
 , Valentina Caorsi
 , Antoine Allard
 , Majdouline AbouGhali
 , John Manzi
 , Aurélie Di Cicco
 , Daniel Lévy
 , Martin Lenz
 , JeanFrançois Joanny
 , Clément Campillo
 , Julie Plastino
 , Pierre Sens
 & Cécile Sykes

Article 
Degenerate Bose gases near a dwave shape resonance
A scattering resonance associated with quasibound diatomic levels trapped behind the centrifugal barrier has been observed in a quantumdegenerate potassium gas. Various measurements reveal the dwave character of the collisions.
 XingCan Yao
 , Ran Qi
 , XiangPei Liu
 , XiaoQiong Wang
 , YuXuan Wang
 , YuPing Wu
 , HaoZe Chen
 , Peng Zhang
 , Hui Zhai
 , YuAo Chen
 & JianWei Pan

Letter 
Discrepancy between experimental and theoretical βdecay rates resolved from first principles
The difference between the βdecay rate predicted for free neutrons and that measured in real nuclei is explained by firstprinciples calculations to arise from strong correlations and the weakforce coupling between nucleons.
 P. Gysbers
 , G. Hagen
 , J. D. Holt
 , G. R. Jansen
 , T. D. Morris
 , P. Navrátil
 , T. Papenbrock
 , S. Quaglioni
 , A. Schwenk
 , S. R. Stroberg
 & K. A. Wendt

Letter 
Broadband Lamb shift in an engineered quantum system
The measured change in the fundamental frequency of a superconducting resonator coupled to a tunnel junction reveals a broadband constant Lamb shift, which is typically inaccessible in atomic systems.
 Matti Silveri
 , Shumpei Masuda
 , Vasilii Sevriuk
 , Kuan Y. Tan
 , Máté Jenei
 , Eric Hyyppä
 , Fabian Hassler
 , Matti Partanen
 , Jan Goetz
 , Russell E. Lake
 , Leif Grönberg
 & Mikko Möttönen

Letter 
Enhanced bacterial swimming speeds in macromolecular polymer solutions
Bacteria and other helical microswimmers are known to swim faster in nonNewtonian fluids. Coarsegrained simulations suggest the increase may be due to a polymer depletion effect near the body and flagellum, inducing a slip velocity at the surface.
 Andreas Zöttl
 & Julia M. Yeomans

Letter 
Chiral exchange drag and chirality oscillations in synthetic antiferromagnets
Drag effects between interacting particles in nearby layers can impact their motion. Here, this idea is extended to angular momentum in domain walls in a synthetic antiferromagnet and synchronization is observed.
 SeeHun Yang
 , Chirag Garg
 & Stuart S. P. Parkin

Letter 
Cluster formation by acoustic forces and active fluctuations in levitated granular matter
Acoustically levitated granular particles offer a platform on which to study selfassembly in a macroscopic system. Precise acoustic tuning reveals how cluster statistics and assembly pathways change as the system moves out of equilibrium.
 Melody X. Lim
 , Anton Souslov
 , Vincenzo Vitelli
 & Heinrich M. Jaeger

Article 
Coherent Xray spectroscopy reveals the persistence of island arrangements during layerbylayer growth
In situ measurements based on coherent Xray spectroscopy are performed during the epitaxial growth of gallium nitride films, revealing a memory effect in the arrangement of islands formed on successive crystal layers.
 Guangxu Ju
 , Dongwei Xu
 , Matthew J. Highland
 , Carol Thompson
 , Hua Zhou
 , Jeffrey A. Eastman
 , Paul H. Fuoss
 , Peter Zapol
 , Hyunjung Kim
 & G. Brian Stephenson

Letter 
Acoustic Landau quantization and quantumHalllike edge states
A graphenelike twodimensional sonic crystal, under uniaxial deformation, experiences a giant uniform pseudomagnetic field. This leads to the quantization of the cyclotron orbits—a kind of acoustic Landau level—that is observed here.
 Xinhua Wen
 , Chunyin Qiu
 , Yajuan Qi
 , Liping Ye
 , Manzhu Ke
 , Fan Zhang
 & Zhengyou Liu

Article 
Aharonov–Bohm interference of fractional quantum Hall edge modes
An interferometer device demonstrates the interference of fractional quantum Hall effect edge states. This is a big step towards braiding nonAbelian anyons.
 J. Nakamura
 , S. Fallahi
 , H. Sahasrabudhe
 , R. Rahman
 , S. Liang
 , G. C. Gardner
 & M. J. Manfra

Letter 
Quantum hardware simulating fourdimensional inelastic neutron scattering
Inelastic neutron scattering is used to probe the spin dynamics of molecular nanomagnets, but extensive supporting computations make the technique challenging. Proofofprinciple experiments now show that quantum computers may solve these computations efficiently.
 A. Chiesa
 , F. Tacchino
 , M. Grossi
 , P. Santini
 , I. Tavernelli
 , D. Gerace
 & S. Carretta

Letter 
A primary radiation standard based on quantum nonlinear optics
Triggered by the fluctuations of the electromagnetic vacuum, parametric downconversion offers a new primary radiation standard based on quantum nonlinear optics.
 Samuel Lemieux
 , Enno Giese
 , Robert Fickler
 , Maria V. Chekhova
 & Robert W. Boyd

Article 
Stochastic nonlinear dynamics of confined cell migration in twostate systems
Twostate micropatterns offer a unique platform to study cell migration. An equation of motion is inferred from a large ensemble of trajectories, revealing key differences in the nonlinear dynamics of healthy and cancerous cells.
 David B. Brückner
 , Alexandra Fink
 , Christoph Schreiber
 , Peter J. F. Röttgermann
 , Joachim O. Rädler
 & Chase P. Broedersz

Article 
Turning a molecule into a coherent twolevel quantum system
A molecule placed in an optical microcavity behaves as a model twolevel quantum system, as demonstrated via laser extinction and interaction with single photons.
 Daqing Wang
 , Hrishikesh Kelkar
 , Diego MartinCano
 , Dominik Rattenbacher
 , Alexey Shkarin
 , Tobias Utikal
 , Stephan Götzinger
 & Vahid Sandoghdar

Letter 
Stress management in composite biopolymer networks
Collagen networks go from soft to rigid when strained, but in tissue they exist in a soft matrix. An enhanced stiffness and delayed strainstiffening is now revealed in the composite, which may explain the remarkable sensitivity of living tissue.
 Federica Burla
 , Justin Tauber
 , Simone Dussi
 , Jasper van der Gucht
 & Gijsje H. Koenderink

Letter 
Dimensional reduction, quantum Hall effect and layer parity in graphite films
The quantum Hall effect is thought to exist only in twodimensional materials. Here, transport measurements show that thin graphite slabs have a 2.5dimensional version, with a parity effect for samples with odd and even number of layers.
 Jun Yin
 , Sergey Slizovskiy
 , Yang Cao
 , Sheng Hu
 , Yaping Yang
 , Inna Lobanova
 , Benjamin A. Piot
 , SeokKyun Son
 , Servet Ozdemir
 , Takashi Taniguchi
 , Kenji Watanabe
 , Kostya S. Novoselov
 , Francisco Guinea
 , A. K. Geim
 , Vladimir Fal’ko
 & Artem Mishchenko

Article 
Magnon–fluxon interaction in a ferromagnet/superconductor heterostructure
A spectral study on a ferromagnet/superconductor heterostructure reveals the interaction between the spinwave excitations in a magnetically ordered system (magnons) and the magnetic flux quanta formed in a superconductor (fluxons).
 O. V. Dobrovolskiy
 , R. Sachser
 , T. Brächer
 , T. Böttcher
 , V. V. Kruglyak
 , R. V. Vovk
 , V. A. Shklovskij
 , M. Huth
 , B. Hillebrands
 & A. V. Chumak

Article 
First constraint on the neutrinoinduced phase shift in the spectrum of baryon acoustic oscillations
In the early Universe, fluctuations in the neutrino density produced a distinct shift in the temporal phase of sound waves in the primordial plasma. The size of this phase shift has now been constrained through baryon acoustic oscillation data.
 Daniel Baumann
 , Florian Beutler
 , Raphael Flauger
 , Daniel Green
 , Anže Slosar
 , Mariana VargasMagaña
 , Benjamin Wallisch
 & Christophe Yèche

Author Correction 
Author Correction: Portraits of physicists
 Marco Bentivegna
 , Richard Brierley
 & Nina Meinzer

Letter 
Measuring quantized circular dichroism in ultracold topological matter
By subjecting a Chern insulator to a circular drive, its geometrical and topological properties would be accessible from the spectroscopic response. This prediction is now confirmed in a Floquet topological system realized by ultracold fermionic atoms.
 Luca Asteria
 , Duc Thanh Tran
 , Tomoki Ozawa
 , Matthias Tarnowski
 , Benno S. Rem
 , Nick Fläschner
 , Klaus Sengstock
 , Nathan Goldman
 & Christof Weitenberg

Article 
Swimming Euglena respond to confinement with a behavioural change enabling effective crawling
Euglenids are unicellular swimmers that undergo striking cell body deformations, interpreted variously as locomotive or functionally redundant. Experiments now suggest that these deformations enable adaptation to a fast crawling mode when the cells are confined.
 Giovanni Noselli
 , Alfred Beran
 , Marino Arroyo
 & Antonio DeSimone

Letter 
Negative flat band magnetism in a spin–orbitcoupled correlated kagome magnet
The authors show that a magnetic material with kagome lattice planes hosts a flat band near the Fermi level. Electrons in this band exhibit ‘negative magnetism’ due to the Berry curvature.
 JiaXin Yin
 , Songtian S. Zhang
 , Guoqing Chang
 , Qi Wang
 , Stepan S. Tsirkin
 , Zurab Guguchia
 , Biao Lian
 , Huibin Zhou
 , Kun Jiang
 , Ilya Belopolski
 , Nana Shumiya
 , Daniel Multer
 , Maksim Litskevich
 , Tyler A. Cochran
 , Hsin Lin
 , Ziqiang Wang
 , Titus Neupert
 , Shuang Jia
 , Hechang Lei
 & M. Zahid Hasan

Article 
Efficient topological materials discovery using symmetry indicators
Symmetry labels of materials under certain space groups can be used to indicate their band topology. Integrating that into firstprinciples bandstructure calculations, new topological materials with a diversity of topological phenomena are discovered.
 Feng Tang
 , Hoi Chun Po
 , Ashvin Vishwanath
 & Xiangang Wan

Article 
Quantum error correction and universal gate set operation on a binomial bosonic logical qubit
Repeated error correction creates a logical qubit encoded in the hybrid state of a superconducting circuit and a bosonic cavity, which is shown to be fully controllable under a universal singlequbit gate set.
 L. Hu
 , Y. Ma
 , W. Cai
 , X. Mu
 , Y. Xu
 , W. Wang
 , Y. Wu
 , H. Wang
 , Y. P. Song
 , C.L. Zou
 , S. M. Girvin
 , LM. Duan
 & L. Sun

Letter 
Proton superfluidity and charge radii in protonrich calcium isotopes
Spectral study on ^{36,37,38}Ca isotopes and calculations based on density functional theory reveal the interplay between charge radii and nucleonic pairing correlations.
 A. J. Miller
 , K. Minamisono
 , A. Klose
 , D. Garand
 , C. Kujawa
 , J. D. Lantis
 , Y. Liu
 , B. Maaß
 , P. F. Mantica
 , W. Nazarewicz
 , W. Nörtershäuser
 , S. V. Pineda
 , P.G. Reinhard
 , D. M. Rossi
 , F. Sommer
 , C. Sumithrarachchi
 , A. Teigelhöfer
 & J. Watkins

Letter 
Axialfieldinduced chiral channels in an acoustic Weyl system
Axial fields couple to the states of different chiralities with opposite signs. In an acoustic Weyl system, the implementation of such fields induces chiral Landau levels, which is now observed experimentally.
 Valerio Peri
 , Marc SerraGarcia
 , Roni Ilan
 & Sebastian D. Huber

Article 
Spin–phonon interactions in silicon carbide addressed by Gaussian acoustics
The authors use surface acoustic waves, focused in a Gaussian geometry, to manipulate the spin state of divacancy defects in silicon carbide via mechanical driving. They demonstrate that shear strain is important in controlling the spin transitions.
 Samuel J. Whiteley
 , Gary Wolfowicz
 , Christopher P. Anderson
 , Alexandre Bourassa
 , He Ma
 , Meng Ye
 , Gerwin Koolstra
 , Kevin J. Satzinger
 , Martin V. Holt
 , F. Joseph Heremans
 , Andrew N. Cleland
 , David I. Schuster
 , Giulia Galli
 & David D. Awschalom

Article 
Scaling behaviour in steadystate contracting actomyosin networks
Actomyosin networks with rapid turnover selforganize within droplets, forming a dynamic steadystate with persistent flows. The networks exhibit homogeneous, densityindependent contraction, implying that active stress scales with viscosity.
 Maya MalikGarbi
 , Niv Ierushalmi
 , Silvia Jansen
 , Enas AbuShah
 , Bruce L. Goode
 , Alex Mogilner
 & Kinneret Keren

Letter 
Selection mechanism at the onset of active turbulence
Experiments on microtubulebased nematics, together with active gel theory, suggest that the length scale associated with active turbulence is selected at its onset—balancing activity with the stabilizing effects of nematic elasticity and geometry.
 Berta MartínezPrat
 , Jordi IgnésMullol
 , Jaume Casademunt
 & Francesc Sagués

Letter 
Quantum stochastic resonance in an a.c.driven singleelectron quantum dot
Quantum stochastic resonance, in which the quantum fluctuation represents the noise needed to amplify an otherwise weak signal, is reported in the charging and discharging of a singleelectron quantum dot.
 Timo Wagner
 , Peter Talkner
 , Johannes C. Bayer
 , Eddy P. Rugeramigabo
 , Peter Hänggi
 & Rolf J. Haug

Article 
Spatiotemporal signal propagation in complex networks
Complex networks with identical topology may exhibit different dynamics. A systematic analysis of signal propagation in networks reveals the existence of three specific dynamic regimes that connect topological features to dynamic patterns.
 Chittaranjan Hens
 , Uzi Harush
 , Simi Haber
 , Reuven Cohen
 & Baruch Barzel

Letter 
Interplay between nuclear shell evolution and shape deformation revealed by the magnetic moment of ^{75}Cu
The magnetic moment of the neutronrich exotic ^{75}Cu nucleus is measured using rare isotope beams with a high spin alignment, clarifying how the evolution of the nuclear shell and the shape deformations are connected.
 Y. Ichikawa
 , H. Nishibata
 , Y. Tsunoda
 , A. Takamine
 , K. Imamura
 , T. Fujita
 , T. Sato
 , S. Momiyama
 , Y. Shimizu
 , D. S. Ahn
 , K. Asahi
 , H. Baba
 , D. L. Balabanski
 , F. Boulay
 , J. M. Daugas
 , T. Egami
 , N. Fukuda
 , C. Funayama
 , T. Furukawa
 , G. Georgiev
 , A. Gladkov
 , N. Inabe
 , Y. Ishibashi
 , T. Kawaguchi
 , T. Kawamura
 , Y. Kobayashi
 , S. Kojima
 , A. Kusoglu
 , I. Mukul
 , M. Niikura
 , T. Nishizaka
 , A. Odahara
 , Y. Ohtomo
 , T. Otsuka
 , D. Ralet
 , G. S. Simpson
 , T. Sumikama
 , H. Suzuki
 , H. Takeda
 , L. C. Tao
 , Y. Togano
 , D. Tominaga
 , H. Ueno
 , H. Yamazaki
 & X. F. Yang

Letter 
Far outofequilibrium spin populations trigger giant spin injection into atomically thin MoS_{2}
Efficient spin injection across ferromagnet/semiconductor interfaces is a major goal for future spintronic approaches. Ultrafast spectroscopy now reveals strong spin currents to be inducible in monolayer MoS_{2} by ultralowintensity laser pulses.
 Liang Cheng
 , Xinbo Wang
 , Weifeng Yang
 , Jianwei Chai
 , Ming Yang
 , Mengji Chen
 , Yang Wu
 , Xiaoxuan Chen
 , Dongzhi Chi
 , Kuan Eng Johnson Goh
 , JianXin Zhu
 , Handong Sun
 , Shijie Wang
 , Justin C. W. Song
 , Marco Battiato
 , Hyunsoo Yang
 & Elbert E. M. Chia

Letter 
Evolution of charge order topology across a magnetic phase transition in cuprate superconductors
A new form of charge ordering is observed in a cuprate superconductor. At low doping, a fully rotationally symmetric ordering appears before becoming locked to the Cu–O bond directions at high doping. The link between charge correlations and fermiology give a perspective on the phase diagram.
 Mingu Kang
 , Jonathan Pelliciari
 , Alex Frano
 , Nicholas Breznay
 , Enrico Schierle
 , Eugen Weschke
 , Ronny Sutarto
 , Feizhou He
 , Padraic Shafer
 , Elke Arenholz
 , Mo Chen
 , Keto Zhang
 , Alejandro Ruiz
 , Zeyu Hao
 , Sylvia Lewin
 , James Analytis
 , Yoshiharu Krockenberger
 , Hideki Yamamoto
 , Tanmoy Das
 & Riccardo Comin

Letter 
Plasmaspheric hiss waves generate a reversed energy spectrum of radiation belt electrons
Observations reveal that electrons in Earth’s outer radiation belt possess a spectrum that partially rises with increasing energy, contrary to common beliefs. Plasma hiss waves scattered off electrons are found to be the origin of this phenomenon.
 H. Zhao
 , B. Ni
 , X. Li
 , D. N. Baker
 , W. R. Johnston
 , W. Zhang
 , Z. Xiang
 , X. Gu
 , A. N. Jaynes
 , S. G. Kanekal
 , J. B. Blake
 , S. G. Claudepierre
 , M. A. Temerin
 , H. O. Funsten
 , G. D. Reeves
 & A. J. Boyd

Letter 
Evidence of a gatetunable Mott insulator in a trilayer graphene moiré superlattice
Report of the likely observation of a Mott insulator in trilayer graphene with a moiré potential. The Mott state can be tuned between different filling fractions via gating, which will enable the careful study of this paradigmatic manybody state.
 Guorui Chen
 , Lili Jiang
 , Shuang Wu
 , Bosai Lyu
 , Hongyuan Li
 , Bheema Lingam Chittari
 , Kenji Watanabe
 , Takashi Taniguchi
 , Zhiwen Shi
 , Jeil Jung
 , Yuanbo Zhang
 & Feng Wang

Article 
Twodimensional spin liquid behaviour in the triangularhoneycomb antiferromagnet TbInO_{3}
Detailed neutron scattering, magnetic susceptibility and muon spin relaxation studies indicate the absence of longrange magnetic order in the quantum magnet TbInO_{3} down to 0.46 K— an observation consistent with quantum spin liquid behaviour.
 Lucy Clark
 , Gabriele Sala
 , Dalini D. Maharaj
 , Matthew B. Stone
 , Kevin S. Knight
 , Mark T. F. Telling
 , Xueyun Wang
 , Xianghan Xu
 , Jaewook Kim
 , Yanbin Li
 , SangWook Cheong
 & Bruce D. Gaulin

Article 
Chipintegrated visible–telecom entangled photon pair source for quantum communication
Efficient photon pair sources connecting visible and telecommunication spectral regions are essential for viable longdistance fibre optic quantum communication architectures. A nanophotonic device is presented that allows kilometrescale time–energy entanglement as an application.
 Xiyuan Lu
 , Qing Li
 , Daron A. Westly
 , Gregory Moille
 , Anshuman Singh
 , Vikas Anant
 & Kartik Srinivasan

Letter 
Leggett mode controlled by light pulses
There has latterly been a renewed interest in collective excitations in condensed matter systems. Now, spectroscopic evidence for the socalled Leggett mode is revealed in the superconductor MgB_{2}.
 Flavio Giorgianni
 , Tommaso Cea
 , Carlo Vicario
 , Christoph P. Hauri
 , Wenura K. Withanage
 , Xiaoxing Xi
 & Lara Benfatto

Letter 
Highsensitivity magnetometry with a single atom in a superposition of two circular Rydberg states
An atom in a superposition of two circular Rydberg states with huge opposite magnetic momenta is reported and demonstrated to be an extremely sensitive probe of the magnetic field.
 E. K. Dietsche
 , A. Larrouy
 , S. Haroche
 , J. M. Raimond
 , M. Brune
 & S. Gleyzes

Article 
Synthesis of antisymmetric spin exchange interaction and chiral spin clusters in superconducting circuits
Paritybreaking antisymmetric spin exchange interaction is reported in clusters of five qubits within superconducting circuits. This allows the creation of chiral spin dynamics, with potential for future quantum simulations of chiral molecules.
 DaWei Wang
 , Chao Song
 , Wei Feng
 , Han Cai
 , Da Xu
 , Hui Deng
 , Hekang Li
 , Dongning Zheng
 , Xiaobo Zhu
 , H. Wang
 , ShiYao Zhu
 & Marlan O. Scully

Article 
Terahertzdriven phonon upconversion in SrTiO_{3}
A spectroscopic study of strontium titanate provides a method for transferring the vibrational energy of a lowfrequency phonon mode to higherfrequency modes, with the potential to access elusive ‘silent’ modes.
 M. Kozina
 , M. Fechner
 , P. Marsik
 , T. van Driel
 , J. M. Glownia
 , C. Bernhard
 , M. Radovic
 , D. Zhu
 , S. Bonetti
 , U. Staub
 & M. C. Hoffmann

Article 
Largescale curvature sensing by directional actin flow drives cellular migration mode switching
Changes in membrane curvature influence how migrating cells navigate their environment. Experiments and modelling reveal that dynamic reorganization of the actin cytoskeleton in response to these changes provides cells with a sensing mechanism.
 Tianchi Chen
 , Andrew CallanJones
 , Eduard Fedorov
 , Andrea Ravasio
 , Agustí Brugués
 , Hui Ting Ong
 , Yusuke Toyama
 , Boon Chuan Low
 , Xavier Trepat
 , Tom Shemesh
 , Raphaël Voituriez
 & Benoît Ladoux

Article 
Direct observation of ion acceleration from a beamdriven wave in a magnetic fusion experiment
A major challenge for achieving useful thermonuclear fusion regimes is heating plasma to reactive temperature conditions. It is demonstrated experimentally how energetic ions, generated via neutral beam injection, can be exploited for this process.
 R. M. Magee
 , A. Necas
 , R. Clary
 , S. Korepanov
 , S. Nicks
 , T. Roche
 , M. C. Thompson
 , M. W. Binderbauer
 & T. Tajima

Publisher Correction 
Publisher Correction: Highharmonic generation from solids
 Shambhu Ghimire
 & David A. Reis

Article 
Topological marker currents in Chern insulators
While topological states are often characterized by their global properties related to the topological invariants, the introduced realspace topological markers provide new insights to these states.
 M. D. Caio
 , G. Möller
 , N. R. Cooper
 & M. J. Bhaseen

Letter 
Quantum interference in secondharmonic generation from monolayer WSe_{2}
Quantum interference between electronic pathways is generally difficult to observe in solidstate systems. Such interference is, however, now characterized in the secondharmonic generation from transition metal dichalcogenides, even at room temperature.
 KaiQiang Lin
 , Sebastian Bange
 & John M. Lupton