Letters

  • Letter |

    In natural materials, defects determine many properties. In spin-analogue mechanical metamaterials, deterministically inserted topological defects enable the design of complex deformation and stress distributions.

    • Anne S. Meeussen
    • , Erdal C. Oğuz
    • , Yair Shokef
    •  & Martin van Hecke
  • Letter |

    A combined ARPES and DFT study of Ru- and Rh-substituted samples of Sr2IrO4 reveals a collapse of its correlated insulating phase that is controlled by spin–orbit coupling.

    • B. Zwartsenberg
    • , R. P. Day
    • , E. Razzoli
    • , M. Michiardi
    • , N. Xu
    • , M. Shi
    • , J. D. Denlinger
    • , G. Cao
    • , S. Calder
    • , K. Ueda
    • , J. Bertinshaw
    • , H. Takagi
    • , B. J. Kim
    • , I. S. Elfimov
    •  & A. Damascelli
  • Letter |

    The motor protein dynein is associated with microtubule force generation in the cell; how it interacts with cytoskeletal fluctuations is still an open question. Here the authors show that dynein can harness these fluctuations to generate power and move faster towards the minus-end of microtubules.

    • Yasin Ezber
    • , Vladislav Belyy
    • , Sinan Can
    •  & Ahmet Yildiz
  • Letter |

    In a mathematical model of democratic elections, electoral instability is shown to be linked to negative representation, which occurs when a shift in electoral opinions pushes the election outcome in the opposite direction.

    • Alexander F. Siegenfeld
    •  & Yaneer Bar-Yam
  • Letter |

    Magnetic reconnection in the near-Earth magnetotail is observed to power a space storm, although suppression of magnetic reconnection caused by the Earth’s magnetic dipole was expected close to Earth.

    • Vassilis Angelopoulos
    • , Anton Artemyev
    • , Tai D. Phan
    •  & Yukinaga Miyashita
  • Letter |

    The authors develop a high-spatial-resolution photoemission technique to show variation of the energy of the Dirac point of approximately 50 meV. They also find an interplay between bulk and surface states.

    • Erica Kotta
    • , Lin Miao
    • , Yishuai Xu
    • , S. Alexander Breitweiser
    • , Chris Jozwiak
    • , Aaron Bostwick
    • , Eli Rotenberg
    • , Wenhan Zhang
    • , Weida Wu
    • , Takehito Suzuki
    • , Joseph Checkelsky
    •  & L. Andrew Wray
  • Letter |

    Experiments demonstrate quantum phase sensing with a four-mode entangled state, reaching a measurement precision that is beyond what can be achieved by separate individual probes.

    • Xueshi Guo
    • , Casper R. Breum
    • , Johannes Borregaard
    • , Shuro Izumi
    • , Mikkel V. Larsen
    • , Tobias Gehring
    • , Matthias Christandl
    • , Jonas S. Neergaard-Nielsen
    •  & Ulrik L. Andersen
  • Letter |

    Four single-photon states are generated and entangled on a single micrometre-scale silicon chip, and provide the basis for the demonstration of chip-to-chip quantum teleportation.

    • Daniel Llewellyn
    • , Yunhong Ding
    • , Imad I. Faruque
    • , Stefano Paesani
    • , Davide Bacco
    • , Raffaele Santagati
    • , Yan-Jun Qian
    • , Yan Li
    • , Yun-Feng Xiao
    • , Marcus Huber
    • , Mehul Malik
    • , Gary F. Sinclair
    • , Xiaoqi Zhou
    • , Karsten Rottwitt
    • , Jeremy L. O’Brien
    • , John G. Rarity
    • , Qihuang Gong
    • , Leif K. Oxenlowe
    • , Jianwei Wang
    •  & Mark G. Thompson
  • Letter |

    The microscopic quantum Hall edge currents and the equilibrium currents that generate the mirror magnetic monopoles in time-reversal-symmetry-broken topological matter are directly imaged in the quantum Hall state in graphene by using a SQUID-on-tip.

    • Aviram Uri
    • , Youngwook Kim
    • , Kousik Bagani
    • , Cyprian K. Lewandowski
    • , Sameer Grover
    • , Nadav Auerbach
    • , Ella O. Lachman
    • , Yuri Myasoedov
    • , Takashi Taniguchi
    • , Kenji Watanabe
    • , Jurgen Smet
    •  & Eli Zeldov
  • Letter |

    Continuous-variables quantum information processing requires non-Gaussian states and operations. The generation of non-Gaussian quantum states of a multimode field is now reported through a mode-selective photon-subtraction scheme

    • Young-Sik Ra
    • , Adrien Dufour
    • , Mattia Walschaers
    • , Clément Jacquard
    • , Thibault Michel
    • , Claude Fabre
    •  & Nicolas Treps
  • Letter |

    The authors use spin waves to demonstrate that charged quantum Hall skyrmions exist away from integer filling. They also see evidence of several fractional skyrmion states.

    • H. Zhou
    • , H. Polshyn
    • , T. Taniguchi
    • , K. Watanabe
    •  & A. F. Young
  • Letter |

    Charge-carrier dynamics are fundamental to the operation and performance of semiconductor devices. In methylammonium lead iodide perovskites, carriers in the non-equilibrium regime after excitation propagate ballistically over 150 nm within 20 fs.

    • Jooyoung Sung
    • , Christoph Schnedermann
    • , Limeng Ni
    • , Aditya Sadhanala
    • , Richard Y. S. Chen
    • , Changsoon Cho
    • , Lee Priest
    • , Jong Min Lim
    • , Hyun-Kyung Kim
    • , Bartomeu Monserrat
    • , Philipp Kukura
    •  & Akshay Rao
  • Letter |

    In inertial confinement fusion experiments, the effect of the overlapping laser beams on the plasma is predicted to lead to a distortion of the electron distribution function, which has now been observed in experiments.

    • David Turnbull
    • , Arnaud Colaïtis
    • , Aaron M. Hansen
    • , Avram L. Milder
    • , John P. Palastro
    • , Joseph Katz
    • , Christophe Dorrer
    • , Brian E. Kruschwitz
    • , David J. Strozzi
    •  & Dustin H. Froula
  • Letter |

    Short pulses of light shift the balance between two competing charge density wave phases, allowing the weaker one to manifest transiently while suppressing the stronger one. This shows that competing phases can be tuned in a non-equilibrium setting.

    • Anshul Kogar
    • , Alfred Zong
    • , Pavel E. Dolgirev
    • , Xiaozhe Shen
    • , Joshua Straquadine
    • , Ya-Qing Bie
    • , Xirui Wang
    • , Timm Rohwer
    • , I-Cheng Tung
    • , Yafang Yang
    • , Renkai Li
    • , Jie Yang
    • , Stephen Weathersby
    • , Suji Park
    • , Michael E. Kozina
    • , Edbert J. Sie
    • , Haidan Wen
    • , Pablo Jarillo-Herrero
    • , Ian R. Fisher
    • , Xijie Wang
    •  & Nuh Gedik
  • Letter |

    High-energy-resolution spectroscopic measurements performed on the Kondo insulator SmB6 reveal the presence of correlation-driven heavy surface states—the heavy Dirac fermions—and shed light on the search for the correlated topological materials.

    • Harris Pirie
    • , Yu Liu
    • , Anjan Soumyanarayanan
    • , Pengcheng Chen
    • , Yang He
    • , M. M. Yee
    • , P. F. S. Rosa
    • , J. D. Thompson
    • , Dae-Jeong Kim
    • , Z. Fisk
    • , Xiangfeng Wang
    • , Johnpierre Paglione
    • , Dirk K. Morr
    • , M. H. Hamidian
    •  & Jennifer E. Hoffman
  • Letter |

    A transient topological response in graphene is driven by a short pulse of light. When the Fermi energy is in the predicted band gap the Hall conductance is around two conductance quanta. An ultrafast detection technique enables the measurement.

    • J. W. McIver
    • , B. Schulte
    • , F.-U. Stein
    • , T. Matsuyama
    • , G. Jotzu
    • , G. Meier
    •  & A. Cavalleri
  • Letter |

    A technique analogous to angle-resolved photoemission spectroscopy used in materials characterization has been developed for interacting Fermi gases in an optical lattice, providing information on the single-particle excitations in a many-body system.

    • Peter T. Brown
    • , Elmer Guardado-Sanchez
    • , Benjamin M. Spar
    • , Edwin W. Huang
    • , Thomas P. Devereaux
    •  & Waseem S. Bakr
  • Letter |

    Strongly interacting bosons in an optical lattice exhibit anomalous subdiffusive evolution when subjected to a dissipative process. The experimental observations are attributed to a mechanism termed ‘interaction-impeding of decoherence’.

    • Raphaël Bouganne
    • , Manel Bosch Aguilera
    • , Alexis Ghermaoui
    • , Jérôme Beugnon
    •  & Fabrice Gerbier
  • Letter |

    The crease patterns for origami-based mechanical metamaterials can fold into myriad 3D shapes, but predicting foldability is no simple task. A framework for designing foldable patterns offers a neat alternative to extensive computer optimization.

    • Peter Dieleman
    • , Niek Vasmel
    • , Scott Waitukaitis
    •  & Martin van Hecke
  • Letter |

    Conventional on-axis electron energy-loss spectroscopy can detect vibrational modes in crystals and amorphous solids at atomic resolution by isolating the specific signal from the background signal and the dipole contributions.

    • Kartik Venkatraman
    • , Barnaby D. A. Levin
    • , Katia March
    • , Peter Rez
    •  & Peter A. Crozier
  • Letter |

    The back-action of electrons can cool a nanomechanical oscillator to a few-quantum state when a current flows through a suspended nanotube. The electron back-action, which is attributed to an electrothermal effect, also induces self-oscillations.

    • C. Urgell
    • , W. Yang
    • , S. L. De Bonis
    • , C. Samanta
    • , M. J. Esplandiu
    • , Q. Dong
    • , Y. Jin
    •  & A. Bachtold
  • Letter |

    Spin-polarized tunnelling data show that the breakdown of antiferromagnetic order and the collapse of the spectral gap are not correlated in Sr2IrO4. This indicates that short-range magnetic correlations are not behind the emergence of the pseudogap.

    • He Zhao
    • , Sujit Manna
    • , Zach Porter
    • , Xiang Chen
    • , Andrew Uzdejczyk
    • , Jagadeesh Moodera
    • , Ziqiang Wang
    • , Stephen D. Wilson
    •  & Ilija Zeljkovic
  • Letter |

    The recently discovered spin-triplet superconductor UTe2 is found to display a number of other ‘re-entrant’ superconducting phases under ultrahigh magnetic fields.

    • Sheng Ran
    • , I-Lin Liu
    • , Yun Suk Eo
    • , Daniel J. Campbell
    • , Paul M. Neves
    • , Wesley T. Fuhrman
    • , Shanta R. Saha
    • , Christopher Eckberg
    • , Hyunsoo Kim
    • , David Graf
    • , Fedor Balakirev
    • , John Singleton
    • , Johnpierre Paglione
    •  & Nicholas P. Butch
  • Letter |

    A phase of quantum-critical behaviour is observed in a kagome lattice material. This arises from the interplay of strong interactions between electrons, and the frustration that arises both from the interactions and the lattice geometry.

    • Hengcan Zhao
    • , Jiahao Zhang
    • , Meng Lyu
    • , Sebastian Bachus
    • , Yoshifumi Tokiwa
    • , Philipp Gegenwart
    • , Shuai Zhang
    • , Jinguang Cheng
    • , Yi-feng Yang
    • , Genfu Chen
    • , Yosikazu Isikawa
    • , Qimiao Si
    • , Frank Steglich
    •  & Peijie Sun
  • Letter |

    Experiments with two counter-propagating laser beams report the observation that the photon momentum is shared between the electron and parent ion in strong-field ionization, which results from the photon’s magnetic field acting on the electron.

    • A. Hartung
    • , S. Eckart
    • , S. Brennecke
    • , J. Rist
    • , D. Trabert
    • , K. Fehre
    • , M. Richter
    • , H. Sann
    • , S. Zeller
    • , K. Henrichs
    • , G. Kastirke
    • , J. Hoehl
    • , A. Kalinin
    • , M. S. Schöffler
    • , T. Jahnke
    • , L. Ph. H. Schmidt
    • , M. Lein
    • , M. Kunitski
    •  & R. Dörner
  • Letter |

    Matter-wave interference experiments demonstrate quantum superposition of molecules consisting of up to 2,000 atoms—the heaviest objects to show this quantum behaviour to date. This provides a bound on potential modifications to quantum mechanics.

    • Yaakov Y. Fein
    • , Philipp Geyer
    • , Patrick Zwick
    • , Filip Kiałka
    • , Sebastian Pedalino
    • , Marcel Mayor
    • , Stefan Gerlich
    •  & Markus Arndt
  • Letter |

    The predicted metallization of hydrogen has long fascinated high-pressure physicists. Conductivity and spectroscopic measurements now reveal that above pressures of 350 GPa, hydrogen starts to conduct in a manner akin to a semimetal.

    • M. I. Eremets
    • , A. P. Drozdov
    • , P. P. Kong
    •  & H. Wang
  • Letter |

    The Kibble–Zurek mechanism, that is, the spontaneous formation of topological defects in a system crossing a continuous phase transition, is observed in a strongly interacting Fermi gas, where the underlying symmetry plays a crucial role.

    • Bumsuk Ko
    • , Jee Woo Park
    •  & Y. Shin
  • Letter |

    Few-layer magnetic materials sometimes show a different form of magnetism from their thicker equivalents. The authors contend that the mechanism is changes in the stacking order in the thin limit that modify the interlayer exchange interaction.

    • Dahlia R. Klein
    • , David MacNeill
    • , Qian Song
    • , Daniel T. Larson
    • , Shiang Fang
    • , Mingyu Xu
    • , R. A. Ribeiro
    • , P. C. Canfield
    • , Efthimios Kaxiras
    • , Riccardo Comin
    •  & Pablo Jarillo-Herrero
  • Letter |

    Stacked 2D materials can host excitons with distinct valley selection rules due to the spatial variation of the moiré pattern. The authors demonstrate this via optical spectroscopy, opening a route for control of optoelectronic devices.

    • Chenhao Jin
    • , Emma C. Regan
    • , Danqing Wang
    • , M. Iqbal Bakti Utama
    • , Chan-Shan Yang
    • , Jeffrey Cain
    • , Ying Qin
    • , Yuxia Shen
    • , Zhiren Zheng
    • , Kenji Watanabe
    • , Takashi Taniguchi
    • , Sefaattin Tongay
    • , Alex Zettl
    •  & Feng Wang
  • Letter |

    Photonic Weyl points—topologically chiral singularity points in three-dimensional momentum space—have been realized in a homogeneous non-reciprocal material without a crystal lattice structure.

    • Dongyang Wang
    • , Biao Yang
    • , Wenlong Gao
    • , Hongwei Jia
    • , Quanlong Yang
    • , Xieyu Chen
    • , Minggui Wei
    • , Changxu Liu
    • , Miguel Navarro-Cía
    • , Jiaguang Han
    • , Weili Zhang
    •  & Shuang Zhang
  • Letter |

    The realization of a molecular lattice clock based on vibrations in diatomic molecules is reported with coherence times lasting over tens of milliseconds, which is enabled by the use of a state-insensitive magic lattice trap.

    • S. S. Kondov
    • , C.-H. Lee
    • , K. H. Leung
    • , C. Liedl
    • , I. Majewska
    • , R. Moszynski
    •  & T. Zelevinsky
  • Letter |

    Electron bunches are generated and accelerated to relativistic velocities by tunnel ionization of neutral gas species in a plasma. This represents a step towards ultra-bright, high-emittance beams in plasma wakefield accelerators. [This summary has been amended from ‘laser-plasma’ to ‘plasma wakefield’ accelerators.]

    • A. Deng
    • , O. S. Karger
    • , T. Heinemann
    • , A. Knetsch
    • , P. Scherkl
    • , G. G. Manahan
    • , A. Beaton
    • , D. Ullmann
    • , G. Wittig
    • , A. F. Habib
    • , Y. Xi
    • , M. D. Litos
    • , B. D. O’Shea
    • , S. Gessner
    • , C. I. Clarke
    • , S. Z. Green
    • , C. A. Lindstrøm
    • , E. Adli
    • , R. Zgadzaj
    • , M. C. Downer
    • , G. Andonian
    • , A. Murokh
    • , D. L. Bruhwiler
    • , J. R. Cary
    • , M. J. Hogan
    • , V. Yakimenko
    • , J. B. Rosenzweig
    •  & B. Hidding
  • Letter |

    A transverse wind is shown to be capable of inciting a droplet to move along a horizontal fibre due to the presence of an asymmetric wake behind the droplet. Such a perturbation can even induce repulsive interactions between droplets.

    • Pierre-Brice Bintein
    • , Hadrien Bense
    • , Christophe Clanet
    •  & David Quéré
  • Letter |

    By coupling a superconducting qubit to surface acoustic waves the ‘giant atom’ regime is realized, where an atom is coupled to a field with wavelength orders of magnitude smaller than the atomic size. This leads to non-Markovian qubit dynamics.

    • Gustav Andersson
    • , Baladitya Suri
    • , Lingzhen Guo
    • , Thomas Aref
    •  & Per Delsing
  • Letter |

    Transport measurements on twisted bilayer graphene show that a large linear-in-temperature increase in resistivity exists for many twist angles. This may have implications for the mechanism of superconductivity in this material.

    • Hryhoriy Polshyn
    • , Matthew Yankowitz
    • , Shaowen Chen
    • , Yuxuan Zhang
    • , K. Watanabe
    • , T. Taniguchi
    • , Cory R. Dean
    •  & Andrea F. Young
  • Letter |

    Experiments with attosecond time resolution reveal many-body electron dynamics in transition metals before thermalization sets in. Ultrafast electronic localization on d orbitals is found to dominate the collective dynamic response of the system.

    • M. Volkov
    • , S. A. Sato
    • , F. Schlaepfer
    • , L. Kasmi
    • , N. Hartmann
    • , M. Lucchini
    • , L. Gallmann
    • , A. Rubio
    •  & U. Keller
  • Letter |

    Three-dimensional spin–orbit coupling is synthesized for ultracold fermions trapped in optical Raman lattice. The band structure bearing a nodal-line semimetal character is reconstructed through a series measurement of spin textures.

    • Bo Song
    • , Chengdong He
    • , Sen Niu
    • , Long Zhang
    • , Zejian Ren
    • , Xiong-Jun Liu
    •  & Gyu-Boong Jo
  • Letter |

    Disorder present in monolayer NbSe2 is found to be able to enhance its superconductivity. A systematic study reveals the origin—disorder-induced multifractality of the electron wavefunctions strengthens the local interactions.

    • Kun Zhao
    • , Haicheng Lin
    • , Xiao Xiao
    • , Wantong Huang
    • , Wei Yao
    • , Mingzhe Yan
    • , Ying Xing
    • , Qinghua Zhang
    • , Zi-Xiang Li
    • , Shintaro Hoshino
    • , Jian Wang
    • , Shuyun Zhou
    • , Lin Gu
    • , Mohammad Saeed Bahramy
    • , Hong Yao
    • , Naoto Nagaosa
    • , Qi-Kun Xue
    • , Kam Tuen Law
    • , Xi Chen
    •  & Shuai-Hua Ji
  • Letter |

    High harmonics are generated from a thin film by leveraging the epsilon-near-zero effect. These kinds of harmonic are found to exhibit a pronounced spectral redshift as well as linewidth broadening caused by the time-dependency of this effect.

    • Yuanmu Yang
    • , Jian Lu
    • , Alejandro Manjavacas
    • , Ting S. Luk
    • , Hanzhe Liu
    • , Kyle Kelley
    • , Jon-Paul Maria
    • , Evan L. Runnerstrom
    • , Michael B. Sinclair
    • , Shambhu Ghimire
    •  & Igal Brener