Research articles

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  • The Hall effect is about the generation of a transverse voltage when a longitudinal current is applied and many mechanisms can lead to Hall effect in magnetic material. Here, the authors report a chiral Hall effect that is proportional to the vector spin chirality in canted magnetic materials.

    • Jonathan Kipp
    • Kartik Samanta
    • Yuriy Mokrousov
    Article Open Access
  • URu2Si2 is known to exhibit a lower temperature phase transition termed a ‘hidden order’ due to the difficulty its detection using conventional solid-state probes and the exact mechanism still remains unknown. Here, the authors use scanning tunnelling microscopy to reveal a 1D charge density wave for cleaved samples of URu2Si2 and demonstrate a potential connection with the hidden order state.

    • Edwin Herrera
    • Víctor Barrena
    • Hermann Suderow
    Article Open Access
  • The underlying mechanism of the superconducting-to-insulator transition under an applied magnetic field has been a topic of debate for many years. Here, the authors investigate the superconductor-to-insulator transition in 2D films and investigate the nature of the transition as a function of sample dimensions and reveal the importance of the quantum-Griffiths singularity.

    • Xiaofu Zhang
    • Adriana E. Lita
    • Andreas Schilling
    Article Open Access
  • Magnons are oscillating magnetic waves that can be engineered using nanoscale structures and are expected to have useful applications in future information processing and storage devices. Here, the authors investigate magnetic superradiance as a possible mechanism limiting the lifetime of the magnonic excitations in thin films.

    • Lukas Weymann
    • Alexey Shuvaev
    • Dávid Szaller
    Article Open Access
  • Wigner’s friend is a thought experiment in theoretical quantum physics that challenges our understanding of quantum theory. The authors present a no-go theorem constraining the structure of probabilities in such a thought experiment and analyze the validity of the three particular assumptions according to various interpretations of quantum mechanics.

    • Philippe Allard Guérin
    • Veronika Baumann
    • Časlav Brukner
    Article Open Access
  • Understanding self-guiding propagation of laser filaments relies on understanding of the fundamental light-matter interactions, and the optical properties of the plasma. The authors experimentally and theoretically study wavelength scaling of the electron collision time in filament-produced plasma using 1.2-2.3 micrometers and demonstrate an anomalous regime of plasma defocusing in solids.

    • Garima C. Nagar
    • Dennis Dempsey
    • Bonggu Shim
    Article Open Access
  • Cooling a mechanical oscillator to its ground state underpins many applications ranging from ultra-precise sensing to quantum information processing. The authors propose a new scheme that addresses the problem of the simultaneous cooling of many mechanical resonators with nearby frequencies.

    • Muhammad Tahir Naseem
    • Özgür E. Müstecaplıoğlu
    Article Open Access
  • An impurity introduced to a many-body quantum environment gets dressed by excitations and it is of a particular interest to understand the limits of the quasi-particle description. The authors theoretically and numerically study an ionic impurity immersed in a weakly interacting gas of bosonic atoms and demonstrate the existence of two main phases of a polaronic regime for weak interactions, and a strongly correlated state with many bosons bound to the ion.

    • Grigory E. Astrakharchik
    • Luis A. Peña Ardila
    • Antonio Negretti
    Article Open Access
  • Emergent collective behaviour has recently been addressed in systems of self-rotating particles, where motion, in particular, is an emergent phenomenon rather than a basic ingredient. Here, the authors derive a continuum model for mixtures of clockwise and counterclockwise Quincke spinners, demonstrating the emergence of same-spin phase separation, traffic lanes, sustained turbulent-like motion, and a chirality breaking transition depending on the fluid inertia of the system.

    • Cody J. Reeves
    • Igor S. Aranson
    • Petia M. Vlahovska
    Article Open Access
  • Due to a combination of strong spin orbit coupling and electron correlations iridates such as Sr2IrO4 exhibit a range of exotic quantum states that can be tuned via their electronic and magnetic properties. Here, the authors investigate the resistive and Raman scattering properties of Co-doped Sr2IrO4 and provide evidence for quantum critical fluctuations in the system.

    • Kousik Samanta
    • Jean C. Souza
    • Eduardo Granado
    Article Open Access
  • Non-line-of-sight imaging allows reconstruction and recognition of an obscured object, but external manipulation of the data can lead to inaccurate results. Here, the accuracy and robustness of passive non-line-of-sight recognition and its fragility to adversarial attacks are studied.

    • Yangyang Wang
    • Yaqin Zhang
    • Xueshuang Xiang
    Article Open Access
  • Spatiotemporal control has permitted the creation of velocity- and direction-tuneable light in free space. Here, numerical simulations propose a means to achieve a reciprocating flying focus by increasing the Rayleigh length and temporal chirp.

    • Zhaoyang Li
    • Yanjun Gu
    • Junji Kawanaka
    Article Open Access
  • The ferroelectric field-effect transistor, which has attracted much attention for application as both a highly energy-efficient logic device and a non-volatile memory device, has often been studied within the framework of equilibrium thermodynamics. Here, the authors theoretically demonstrate the importance of utilizing the correct thermodynamic potential and investigate the impact of free charge accumulation on the equilibrium performance of ferroelectric-based systems.

    • Jasper Bizindavyi
    • Anne S. Verhulst
    • William G. Vandenberghe
    Article Open Access
  • Plasmonics involves the engineering of light-matter interactions and has range of possible uses in the study of quantum phenomenon, but efficient plasmonic sources are required. The authors report a method to achieve efficient two-plasmon spontaneous emission using an epsilon-near-zero material with highly-confined surface plasmon polaritons to simultaneously serve as a two-plasmon emitter for emission acceleration.

    • Futai Hu
    • Liu Li
    • Yuanmu Yang
    Article Open Access
  • Characterizing the interactions between viral and human proteins is key to understand the function and structure of viruses such as SARS-CoV-2 and for informing drug design and repurposing strategies. Here, the authors use statistical physics techniques to perform a systematic multiscale comparison of the effects on the human interactome of SARS-CoV-2 with respect to other viruses, and find that COVID-19 exhibits properties typical of systemic diseases.

    • Arsham Ghavasieh
    • Sebastiano Bontorin
    • Manlio De Domenico
    Article Open Access
  • In the diffusive transport regime, the mean path length of waves has been shown to be independent of the microstructure of the medium. Here, this invariance is shown to persist into the ballistic and localized regimes, as well as into the regime of band-gap materials like photonic crystals.

    • Matthieu Davy
    • Matthias Kühmayer
    • Stefan Rotter
    Article Open Access
  • Optical frequency combs can provide phase-coherent links between optical frequencies and microwaves, allowing for precise optical frequency generation; however current technologies require external optical references or multiple power-intensive peripherals that make them less suitable for on-chip applications. Here, the authors present phase stabilization of a frequency microcomb without nonlinear processes nor external optical reference signals.

    • Abhinav Kumar Vinod
    • Shu-Wei Huang
    • Chee Wei Wong
    Article Open Access
  • Metamaterials are designed to control unconventional wave properties in acoustic systems with a range of applications such as acoustic cloaking. Here, the authors design an active acoustic Willis metamaterial that can realize decoupled polarizabilities beyond the bound of passivity and reciprocity.

    • Choonlae Cho
    • Xinhua Wen
    • Jensen Li
    Article Open Access