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  • Author Correction: Giant fractional Shapiro steps in anisotropic Josephson junction arrays
    Commun. Phys. (IF 4.684) Pub Date : 2020-09-22
    R. Panghotra; B. Raes; Clécio C. de Souza Silva; I. Cools; W. Keijers; J. E. Scheerder; V. V. Moshchalkov; J. Van de Vondel

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

  • Cross-diffusion induced patterns for a single-step enzymatic reaction
    Commun. Phys. (IF 4.684) Pub Date : 2020-09-22
    Giovanni Giunta; Hamid Seyed-Allaei; Ulrich Gerland

    Several different enzymes display an apparent diffusion coefficient that increases with the concentration of their substrate. Moreover, their motion becomes directed in substrate gradients. Currently, there are several competing models for these transport dynamics. Here, we use mathematical modeling and numerical simulations to analyze whether the enzymatic reactions can generate a significant feedback

  • In peer review we trust
    Commun. Phys. (IF 4.684) Pub Date : 2020-09-21

    Trust is the theme of this year’s peer review week. Confidence in the most broadly used form of assessment, and often considered a quality seal, of scholarly communication, remains high. However, the continuously evolving means of disseminating science and the exponential growth of research output require journals to do more to reassure their authors and readers on the rigour of peer review, while

  • Bidirectional motion of droplets on gradient liquid infused surfaces
    Commun. Phys. (IF 4.684) Pub Date : 2020-09-21
    Muhammad Subkhi Sadullah; Gaby Launay; Jayne Parle; Rodrigo Ledesma-Aguilar; Yonas Gizaw; Glen McHale; Gary George Wells; Halim Kusumaatmaja

    The current paradigm of self-propelled motion of liquid droplets on surfaces with chemical or topographical wetting gradients is always mono-directional. In contrast, here, we demonstrate bidirectional droplet motion, which we realize using liquid infused surfaces with topographical gradients. The deposited droplet can move either toward the denser or the sparser solid fraction area. We rigorously

  • Ultrathin complex oxide nanomechanical resonators
    Commun. Phys. (IF 4.684) Pub Date : 2020-09-18
    D. Davidovikj; D. J. Groenendijk; A. M. R. V. L. Monteiro; A. Dijkhoff; D. Afanasiev; M. Šiškins; M. Lee; Y. Huang; E. van Heumen; H. S. J. van der Zant; A. D. Caviglia; P. G. Steeneken

    Complex oxide thin films and heterostructures exhibit a variety of electronic phases, often controlled by the mechanical coupling between film and substrate. Recently it has become possible to isolate epitaxially grown single-crystalline layers of these materials, enabling the study of their properties in the absence of interface effects. In this work, we use this technique to create nanomechanical

  • Surface anchoring controls orientation of a microswimmer in nematic liquid crystal
    Commun. Phys. (IF 4.684) Pub Date : 2020-09-18
    Hai Chi; Mykhailo Potomkin; Lei Zhang; Leonid Berlyand; Igor S. Aranson

    Microscopic swimmers, both living and synthetic, often dwell in anisotropic viscoelastic environments. The most representative realization of such an environment is water-soluble liquid crystals. Here, we study how the local orientation order of liquid crystal affects the motion of a prototypical elliptical microswimmer. In the framework of well-validated Beris-Edwards model, we show that the microswimmer’s

  • Emergent charge order from correlated electron-phonon physics in cuprates
    Commun. Phys. (IF 4.684) Pub Date : 2020-09-18
    S. Banerjee; W. A. Atkinson; A. P. Kampf

    Charge-density wave order is now understood to be a widespread feature of underdoped cuprate high-temperature superconductors, although its origins remain unclear. While experiments suggest that the charge-ordering wavevector is determined by Fermi-surface nesting, the relevant sections of the Fermi surface are featureless and provide no clue as to the underlying mechanism. Here, focusing on underdoped

  • Magnon-driven dynamics of a hybrid system excited with ultrafast optical pulses
    Commun. Phys. (IF 4.684) Pub Date : 2020-09-18
    N. Crescini; C. Braggio; G. Carugno; R. Di Vora; A. Ortolan; G. Ruoso

    The potential of photon-magnon hybrid systems as building blocks for quantum information science has been widely demonstrated, and it is still the focus of much research. We leverage the strengths of this unique heterogeneous physical system in the field of precision physics beyond the standard model, where the sensitivity to the so-called “invisibles” is currently being boosted by quantum technologies

  • Electronic decoupling of polyacenes from the underlying metal substrate by sp 3 carbon atoms
    Commun. Phys. (IF 4.684) Pub Date : 2020-09-15
    Mohammed S. G. Mohammed; Luciano Colazzo; Roberto Robles; Ruth Dorel; Antonio M. Echavarren; Nicolás Lorente; Dimas G. de Oteyza

    On-surface synthesis is becoming an increasingly popular approach to obtain new organic materials. In this context, metallic surfaces are the most commonly used substrates. However, their hybridization with the adsorbates often hinder a proper characterization of the molecule’s intrinsic electronic and magnetic properties. Here we report a route to electronically decouple molecules from their supporting

  • Living optical random neural network with three dimensional tumor spheroids for cancer morphodynamics
    Commun. Phys. (IF 4.684) Pub Date : 2020-09-15
    D. Pierangeli; V. Palmieri; G. Marcucci; C. Moriconi; G. Perini; M. De Spirito; M. Papi; C. Conti

    Optical neural networks process information at the speed of light and are energetically efficient. Photonic artificial intelligence allows speech recognition, image classification, and Ising machines. Modern machine learning paradigms, as extreme learning machines, reveal that disordered and biological materials may realize optical neural networks with thousands of nodes trained only at the input and

  • Work function seen with sub-meV precision through laser photoemission
    Commun. Phys. (IF 4.684) Pub Date : 2020-09-11
    Y. Ishida; J. K. Jung; M. S. Kim; J. Kwon; Y. S. Kim; D. Chung; I. Song; C. Kim; T. Otsu; Y. Kobayashi

    Electron emission can be utilised to measure the work function of the surface. However, the number of significant digits in the values obtained through thermionic-, field- and photo-emission techniques is typically just two or three. Here, we show that the number can go up to five when angle-resolved photoemission spectroscopy (ARPES) is applied. This owes to the capability of ARPES to detect the slowest

  • Energy relaxation pathways between light-matter states revealed by coherent two-dimensional spectroscopy
    Commun. Phys. (IF 4.684) Pub Date : 2020-09-11
    Lars Mewes; Mao Wang; Rebecca A. Ingle; Karl Börjesson; Majed Chergui

    Coupling matter excitations to electromagnetic modes inside nano-scale optical resonators leads to the formation of hybrid light-matter states, so-called polaritons, allowing the controlled manipulation of material properties. Here, we investigate the photo-induced dynamics of a prototypical strongly-coupled molecular exciton-microcavity system using broadband two-dimensional Fourier transform spectroscopy

  • Nanobenders as efficient piezoelectric actuators for widely tunable nanophotonics at CMOS-level voltages
    Commun. Phys. (IF 4.684) Pub Date : 2020-09-04
    Wentao Jiang; Felix M. Mayor; Rishi N. Patel; Timothy P. McKenna; Christopher J. Sarabalis; Amir H. Safavi-Naeini

    Tuning and reconfiguring of nanophotonic components are needed to realize systems incorporating many components. The electrostatic force can deform a structure and tune its optical response. Despite the success of electrostatic actuators, they suffer from trade-offs between tuning voltage, tuning range, and on-chip area. Piezoelectric actuation could resolve these challenges, but only pm-per-volt scale

  • Optimal number of faces for fast self-folding kirigami
    Commun. Phys. (IF 4.684) Pub Date : 2020-09-02
    H. P. M. Melo; C. S. Dias; N. A. M. Araújo

    There is an increasing body of research studying how to obtain 3D structures at the microscale from the spontaneous folding of planar templates, using thermal fluctuations as the driving force. Here, combining numerical simulations and analytical calculations, we show that the total folding time of a regular pyramid is a non-monotonic function of the number of faces (N), with a minimum for five faces

  • Long-range nonspreading propagation of sound beam through periodic layered structure
    Commun. Phys. (IF 4.684) Pub Date : 2020-09-02
    Yurii Zubov; Bahram Djafari-Rouhani; Yuqi Jin; Mathew Sofield; Ezekiel Walker; Arup Neogi; Arkadii Krokhin

    Linear spreading of a wave packet or a Gaussian beam is a fundamental effect known in evolution of quantum state and propagation of optical/acoustic beams. The rate of spreading is determined by the diffraction coefficient D which is proportional to the curvature of the isofrequency surface. Here, we analyzed dispersion of sound in a solid-fluid layered structure and found a flex point on the isofrequency

  • Time-stretch infrared spectroscopy
    Commun. Phys. (IF 4.684) Pub Date : 2020-09-01
    Akira Kawai; Kazuki Hashimoto; Tatsuo Dougakiuchi; Venkata Ramaiah Badarla; Takayuki Imamura; Tadataka Edamura; Takuro Ideguchi

    Improving the spectral acquisition rate of broadband mid-infrared spectroscopy promises further advancements of molecular science and technology. Unlike pump-probe spectroscopy, which requires repeated measurements with different pump-probe delays, continuous spectroscopy running at a high spectral acquisition rate enables transient measurements of fast non-repeating phenomena or statistical analysis

  • Edge effects on optically detected magnetic resonance of vacancy defects in hexagonal boron nitride
    Commun. Phys. (IF 4.684) Pub Date : 2020-08-31
    A. Sajid; Kristian S. Thygesen; Jeffrey R. Reimers; Michael J. Ford

    The chemical and structural nature of defects responsible for quantum emission in hexagonal boron nitride (h-BN) remain unknown. Optically detected magnetic resonance (ODMR) measured from these defects was reported in two recent papers. In one case, the ODMR was tentatively attributed to the negatively charged boron vacancy, \(V_{\mathrm{B}}^ -\). Here we show how the key optical and magnetic properties

  • Complete spatiotemporal and polarization characterization of ultrafast vector beams
    Commun. Phys. (IF 4.684) Pub Date : 2020-08-31
    Benjamín Alonso; Ignacio Lopez-Quintas; Warein Holgado; Rokas Drevinskas; Peter G. Kazansky; Carlos Hernández-García; Íñigo J. Sola

    The use of structured ultrashort pulses with coupled spatiotemporal properties is emerging as a key tool for ultrafast manipulation. Ultrafast vector beams are opening exciting opportunities in different fields such as microscopy, time-resolved imaging, nonlinear optics, particle acceleration or attosecond science. Here, we implement a technique for the full characterization of structured time-dependent

  • Optimized protocol for twin-field quantum key distribution
    Commun. Phys. (IF 4.684) Pub Date : 2020-08-28
    Rong Wang; Zhen-Qiang Yin; Feng-Yu Lu; Shuang Wang; Wei Chen; Chun-Mei Zhang; Wei Huang; Bing-Jie Xu; Guang-Can Guo; Zheng-Fu Han

    Twin-field quantum key distribution (TF-QKD) and its variant protocols are highly attractive due to the advantage of overcoming the rate-loss limit for secret key rates of point-to-point QKD protocols. For variations of TF-QKD, the key point to ensure security is switching randomly between a code mode and a test mode. Among all TF-QKD protocols, their code modes are very different, e.g. modulating

  • Highly scalable multicycle THz production with a homemade periodically poled macrocrystal
    Commun. Phys. (IF 4.684) Pub Date : 2020-08-28
    François Lemery; Thomas Vinatier; Frank Mayet; Ralph Aßmann; Elsa Baynard; Julien Demailly; Ulrich Dorda; Bruno Lucas; Alok-Kumar Pandey; Moana Pittman

    The THz regime is widely appealing across many disciplines including solid-state physics, life sciences, and increasingly in particle acceleration. Multicycle THz pulses are typically formed via optical rectification in periodically poled crystals. However the manufacturing procedures of these crystals limit their apertures to below ~1 cm, which from damage limitations of the crystal, limits the total

  • Localized-to-itinerant transition preceding antiferromagnetic quantum critical point and gapless superconductivity in CeRh 0.5 Ir 0.5 In 5
    Commun. Phys. (IF 4.684) Pub Date : 2020-08-27
    Shinji Kawasaki; Toshihide Oka; Akira Sorime; Yuji Kogame; Kazuhiro Uemoto; Kazuaki Matano; Jing Guo; Shu Cai; Liling Sun; John L. Sarrao; Joe D. Thompson; Guo-qing Zheng

    A fundamental problem posed from the study of correlated electron compounds, of which heavy-fermion systems are prototypes, is the need to understand the physics of states near a quantum critical point (QCP). At a QCP, magnetic order is suppressed continuously to zero temperature and unconventional superconductivity often appears. Here, we report pressure (P)-dependent 115In nuclear quadrupole resonance

  • Ultrafast and anharmonic Rabi oscillations between non-Bloch bands
    Commun. Phys. (IF 4.684) Pub Date : 2020-08-26
    Ching Hua Lee; Stefano Longhi

    Bloch band theory and bulk-boundary correspondence in non-Hermitian systems are attracting great attention in different areas of science. Interband transitions and Rabi flopping induced by emission or absorption of field quanta are fundamental and well-understood processes in Hermitian systems. However, they are challenged in a non-Hermitian system, where band theory is affected by system boundaries

  • Relative importance of nonlinear electron-phonon coupling and vertex corrections in the Holstein model
    Commun. Phys. (IF 4.684) Pub Date : 2020-08-21
    Philip M. Dee; Jennifer Coulter; Kevin G. Kleiner; Steven Johnston

    Determining the range of validity of Migdal’s approximation for electron-phonon (e-ph) coupled systems is a long-standing problem. Many attempts to answer this question employ the Holstein Hamiltonian, where the electron density couples linearly to local lattice displacements. When these displacements are large, however, nonlinear corrections to the interaction must also be included, which can significantly

  • All-optical supercontinuum switching
    Commun. Phys. (IF 4.684) Pub Date : 2020-08-21
    Oliver Melchert; Carsten Brée; Ayhan Tajalli; Alexander Pape; Rostislav Arkhipov; Stephanie Willms; Ihar Babushkin; Dmitry Skryabin; Günter Steinmeyer; Uwe Morgner; Ayhan Demircan

    Efficient all-optical switching is a challenging task as photons are bosons and cannot immediately interact with each other. Consequently, one has to resort to nonlinear optical interactions, with the Kerr gate being the classical example. However, the latter requires strong pulses to switch weaker ones. Numerous approaches have been investigated to overcome the resulting lack of fan-out capability

  • Direct probe of the interior of an electric pion in a Cooper pair superinsulator
    Commun. Phys. (IF 4.684) Pub Date : 2020-08-20
    M. C. Diamantini; S. V. Postolova; A. Yu. Mironov; L. Gammaitoni; C. Strunk; C. A. Trugenberger; V. M. Vinokur

    The nature of hadrons is one of the most fundamental mysteries of physics. It is generally agreed that they are made of “colored” quarks, which move nearly free at short scales but are confined inside hadrons by strong interactions at large distances. Because of confinement, quarks are never directly observable and, experimentally, their properties can be tested only indirectly, via high energy collisions

  • Topological transitions in superconductor nanomembranes under a strong transport current
    Commun. Phys. (IF 4.684) Pub Date : 2020-08-20
    R. O. Rezaev; E. I. Smirnova; O. G. Schmidt; V. M. Fomin

    The topological defects, vortices in bulk superconductors (SCs) and phase slips in low-dimensional SCs are known to lead to the occurrence of a finite resistance. We report on a topological transition between the both types of topological defects under a strong transport current in an open SC nanotube with a submicron-scale inhomogeneity of the normal-to-the-surface component of the applied magnetic

  • Creating an executable paper is a journey through Open Science
    Commun. Phys. (IF 4.684) Pub Date : 2020-08-19
    Jana Lasser

    Executable papers take transparency and openness in research communication one step further. In this comment, an early career researcher reports her experience of creating an executable paper as a journey through Open Science.

  • Direct observation of time-asymmetric breakdown of the standard adiabaticity around an exceptional point
    Commun. Phys. (IF 4.684) Pub Date : 2020-08-14
    Youngsun Choi; Jae Woong Yoon; Jong Kyun Hong; Yeonghwa Ryu; Seok Ho Song

    Recent study on topological operations around an exceptional point singularity has shown remarkably robust chiral processes that potentially create time-asymmetric or nonreciprocal systems and devices. Nevertheless, direct observation of the entire dynamics in the courses of the topological operations has not been revealed in experiments thus far. Here, we report a comprehensive experimental study

  • Quantum and nonlinear effects in light transmitted through planar atomic arrays
    Commun. Phys. (IF 4.684) Pub Date : 2020-08-14
    Robert J. Bettles; Mark D. Lee; Simon A. Gardiner; Janne Ruostekoski

    Understanding strong cooperative optical responses in dense and cold atomic ensembles is vital for fundamental science and emerging quantum technologies. Methodologies for characterizing light-induced quantum effects in such systems, however, are still lacking. Here we unambiguously identify significant quantum many-body effects, robust to position fluctuations and strong dipole–dipole interactions

  • Deterministic control of an antiferromagnetic spin arrangement using ultrafast optical excitation
    Commun. Phys. (IF 4.684) Pub Date : 2020-08-14
    Y. W. Windsor; A. Ernst; K. Kummer; K. Kliemt; Ch. Schüßler-Langeheine; N. Pontius; U. Staub; E. V. Chulkov; C. Krellner; D. V. Vyalikh; L. Rettig

    A central prospect of antiferromagnetic spintronics is to exploit magnetic properties that are unavailable with ferromagnets. However, this poses the challenge of accessing such properties for readout and control. To this end, light-induced manipulation of the transient ground state, e.g. by changing the magnetic anisotropy potential, opens promising pathways towards ultrafast deterministic control

  • Two-photon comb with wavelength conversion and 20-km distribution for quantum communication
    Commun. Phys. (IF 4.684) Pub Date : 2020-08-12
    Kazuya Niizeki; Daisuke Yoshida; Ko Ito; Ippei Nakamura; Nobuyuki Takei; Kotaro Okamura; Ming-Yang Zheng; Xiu-Ping Xie; Tomoyuki Horikiri

    Quantum computing and quantum communication, have been greatly developed in recent years and expected to contribute to quantum internet technologies, including cloud quantum computing and unconditionally secure communication. However, long-distance quantum communication is challenging mainly because of optical fiber losses; quantum repeaters are indispensable for fiber-based transmission because unknown

  • Dynamical symmetry of strongly light-driven electronic system in crystalline solids
    Commun. Phys. (IF 4.684) Pub Date : 2020-08-11
    Kohei Nagai; Kento Uchida; Naotaka Yoshikawa; Takahiko Endo; Yasumitsu Miyata; Koichiro Tanaka

    The Floquet state, which is a periodically and intensely light-driven quantum state in solids, has been attracting attention as a novel state that is coherently controllable on an ultrafast time scale. An important issue has been to demonstrate experimentally novel electronic properties in the Floquet state. One technique is light scattering spectroscopy, which offers an important clue to clarifying

  • Minimal unlinking pathways as geodesics in knot polynomial space
    Commun. Phys. (IF 4.684) Pub Date : 2020-08-10
    Xin Liu; Renzo L. Ricca; Xin-Fei Li

    Physical knots observed in various contexts – from DNA biology to vortex dynamics and condensed matter physics – are found to undergo topological simplification through iterated recombination of knot strands following a common, qualitative pattern that bears remarkable similarities across fields. Here, by interpreting evolutionary processes as geodesic flows in a suitably defined knot polynomial space

  • A double quantum dot spin valve
    Commun. Phys. (IF 4.684) Pub Date : 2020-08-06
    Arunav Bordoloi; Valentina Zannier; Lucia Sorba; Christian Schönenberger; Andreas Baumgartner

    A most fundamental goal in spintronics is to electrically tune highly efficient spin injectors and detectors, preferably compatible with nanoscale electronics and superconducting elements. These functionalities can be obtained using semiconductor quantum dots, spin-polarized by a ferromagnetic split-gate, which we demonstrate in a double quantum dot spin valve with two weakly coupled quantum dots in

  • Laser cooling of ytterbium-doped silica glass
    Commun. Phys. (IF 4.684) Pub Date : 2020-08-05
    Esmaeil Mobini; Saeid Rostami; Mostafa Peysokhan; Alexander Albrecht; Stefan Kuhn; Sigrun Hein; Christian Hupel; Johannes Nold; Nicoletta Haarlammert; Thomas Schreiber; Ramona Eberhardt; Andreas Tünnermann; Mansoor Sheik-Bahae; Arash Mafi

    Laser cooling of a solid is achieved when a coherent laser illuminates the material in the red tail of its absorption spectrum, and the heat is carried out by anti-Stokes fluorescence of the blue-shifted photons. Solid-state laser cooling has been successfully demonstrated in several materials, including rare-earth-doped crystals and glasses. Silica glass, being the most widely used optical material

  • A theoretical model of laser-driven ion acceleration from near-critical double-layer targets
    Commun. Phys. (IF 4.684) Pub Date : 2020-08-04
    Andrea Pazzaglia; Luca Fedeli; Arianna Formenti; Alessandro Maffini; Matteo Passoni

    Laser-driven ion sources are interesting for many potential applications, from nuclear medicine to material science. A promising strategy to enhance both ion energy and number is given by Double-Layer Targets (DLTs), i.e. micrometric foils coated by a near-critical density layer. Optimization of DLT parameters for a given laser setup requires a deep and thorough understanding of the physics at play

  • The 29 F nucleus as a lighthouse on the coast of the island of inversion
    Commun. Phys. (IF 4.684) Pub Date : 2020-07-31
    L. Fortunato; J. Casal; W. Horiuchi; Jagjit Singh; A. Vitturi

    The exotic, neutron-rich and weakly-bound isotope 29F stands out as a waymarker on the southern shore of the island of inversion, a portion of the nuclear chart where the effects of nuclear forces lead to a reshuffling of the single particle levels and to a reorganization of the nuclear structure far from stability. This nucleus has become very popular, as new measurements allow to refine theoretical

  • Single channel Josephson effect in a high transmission atomic contact
    Commun. Phys. (IF 4.684) Pub Date : 2020-07-24
    Jacob Senkpiel; Simon Dambach; Markus Etzkorn; Robert Drost; Ciprian Padurariu; Björn Kubala; Wolfgang Belzig; Alfredo Levy Yeyati; Juan Carlos Cuevas; Joachim Ankerhold; Christian R. Ast; Klaus Kern

    The Josephson effect in scanning tunneling microscopy (STM) is an excellent tool to probe the properties of a superconductor on a local scale. We use atomic manipulation in a low temperature STM to create mesoscopic single channel contacts and study the Josephson effect at arbitrary transmissions. We observe significant deviations from the Ambegaokar-Baratoff formula relating the critical current to

  • Realization of photonic charge-2 Dirac point by engineering super-modes in topological superlattices
    Commun. Phys. (IF 4.684) Pub Date : 2020-07-23
    Mengying Hu; Kun Ding; Tong Qiao; Xi Jiang; Qiang Wang; Shining Zhu; Hui Liu

    Quite recently, an unconventional variety of fourfold linear band degeneracy points has been discovered in certain condensed-matter systems. Contrary to standard 3-D Dirac monopoles, these quadruple points known as the charge-2 Dirac points are characterized by nonzero topological charges, which can be exploited to delve into hitherto unknown realms of topological physics. Here, we report on the experimental

  • Time-reversal of an unknown quantum state
    Commun. Phys. (IF 4.684) Pub Date : 2020-07-21
    A. V. Lebedev; V. M. Vinokur

    For decades, researchers have sought to understand how the irreversibility of the surrounding world emerges from the seemingly time-symmetric, fundamental laws of physics. Quantum mechanics conjectured a clue that final irreversibility is set by the measurement procedure and that the time-reversal requires complex conjugation of the wave function, which is overly complex to spontaneously appear in

  • Nonlocal chiral symmetry breaking in curvilinear magnetic shells
    Commun. Phys. (IF 4.684) Pub Date : 2020-07-20
    Denis D. Sheka; Oleksandr V. Pylypovskyi; Pedro Landeros; Yuri Gaididei; Attila Kákay; Denys Makarov

    The concept of curvature and chirality in space and time are foundational for the understanding of the organic life and formation of matter in the Universe. Chiral interactions but also curvature effects are tacitly accepted to be local. A prototypical condensed matter example is a local spin-orbit- or curvature-induced Rashba or Dzyaloshinskii-Moriya interactions. Here, we introduce a chiral effect

  • Realization of a motility-trap for active particles
    Commun. Phys. (IF 4.684) Pub Date : 2020-07-14
    Soudeh Jahanshahi; Celia Lozano; Benno Liebchen; Hartmut Löwen; Clemens Bechinger

    Trapping of atomic and mesoscopic particles with optical fields is a practical technique employed in many research disciplines. Developing similar trapping methods for self-propelled, i.e. active, particles is, however, challenging due to the typical anisotropic material composition of Janus-type active particles. This renders their trapping with magneto-optical fields to be difficult. Here we present

  • Rapid onset of molecular friction in liquids bridging between the atomistic and hydrodynamic pictures
    Commun. Phys. (IF 4.684) Pub Date : 2020-07-10
    Arthur V. Straube; Bartosz G. Kowalik; Roland R. Netz; Felix Höfling

    Friction in liquids arises from conservative forces between molecules and atoms. Although the hydrodynamics at the nanoscale is subject of intense research and despite the enormous interest in the non-Markovian dynamics of single molecules and solutes, the onset of friction from the atomistic scale so far could not be demonstrated. Here, we fill this gap based on frequency-resolved friction data from

  • Temperature induced shifts of Yu–Shiba–Rusinov resonances in nanowire-based hybrid quantum dots
    Commun. Phys. (IF 4.684) Pub Date : 2020-07-10
    Juan Carlos Estrada Saldaña; Alexandros Vekris; Victoria Sosnovtseva; Thomas Kanne; Peter Krogstrup; Kasper Grove-Rasmussen; Jesper Nygård

    The strong coupling of a superconductor to a spinful quantum dot results in Yu–Shiba–Rusinov discrete subgap excitations. In isolation and at zero temperature, the excitations are sharp resonances. In transport experiments, however, they show as broad differential conductance peaks. Here we obtain the lineshape of the peaks and their temperature dependence in superconductor–quantum dot–metal nanowire-based

  • Interferometric and fluorescence analysis of shock wave effects on cell membrane
    Commun. Phys. (IF 4.684) Pub Date : 2020-07-08
    Yusuke Ito; David Veysset; Steven E. Kooi; Dmitro Martynowych; Keiichi Nakagawa; Keith A. Nelson

    Shock waves generated by laser pulses have been gaining attention for biological and medical applications in which shock-induced cell membrane deformation influences cell permeation. However, the mechanisms through which the deformation of cell membranes affects permeability remain mostly unknown because of the difficulty of observing in real time the transient and dynamic behaviors of the shock waves

  • Loop currents in two-leg ladder cuprates
    Commun. Phys. (IF 4.684) Pub Date : 2020-07-07
    Dalila Bounoua; Lucile Mangin-Thro; Jaehong Jeong; Romuald Saint-Martin; Loreynne Pinsard-Gaudart; Yvan Sidis; Philippe Bourges

    New phases with broken discrete Ising symmetries are uncovered in quantum materials with strong electronic correlations. The two-leg ladder cuprate Sr14−xCaxCu24O41 hosts a very rich phase diagram where, upon hole doping, the system exhibits a spin liquid state ending to an intriguing ordered magnetic state at larger Ca content. Using polarized neutron diffraction, we report here the existence of short

  • From the butterfly effect to spontaneous stochasticity in singular shear flows
    Commun. Phys. (IF 4.684) Pub Date : 2020-07-06
    Simon Thalabard; Jérémie Bec; Alexei A. Mailybaev

    The butterfly effect is today commonly identified with the sensitive dependence of deterministic chaotic systems upon initial conditions. However, this is only one facet of the notion of unpredictability pioneered by Lorenz, who actually predicted that multiscale fluid flows could spontaneously lose their deterministic nature and become intrinsically random. This effect, which is radically different

  • A tuneable telecom wavelength entangled light emitting diode deployed in an installed fibre network
    Commun. Phys. (IF 4.684) Pub Date : 2020-07-03
    Zi-Heng Xiang; Jan Huwer; Joanna Skiba-Szymanska; R. Mark Stevenson; David J. P. Ellis; Ian Farrer; Martin B. Ward; David A. Ritchie; Andrew J. Shields

    Entangled light emitting diodes based on semiconductor quantum dots are promising devices for security sensitive quantum network applications, thanks to their natural lack of multi photon-pair generation. Apart from telecom wavelength emission, network integrability of these sources ideally requires electrical operation for deployment in compact systems in the field. For multiplexing of entangled photons

  • Optical analogues to the equatorial Kerr–Newman black hole
    Commun. Phys. (IF 4.684) Pub Date : 2020-07-03
    R. A. Tinguely; Andrew P. Turner

    Optical analogues to black holes allow the investigation of general relativity in a laboratory setting. Previous works have considered analogues to Schwarzschild black holes in an isotropic coordinate system; the major drawback is that required material properties diverge at the horizon. We present the dielectric permittivity and permeability tensors that exactly reproduce the equatorial Kerr–Newman

  • Flow-to-fracture transition and pattern formation in a discontinuous shear thickening fluid
    Commun. Phys. (IF 4.684) Pub Date : 2020-07-03
    Deren Ozturk; Miles L. Morgan; Bjørnar Sandnes

    Recent theoretical and experimental work suggests a frictionless-frictional transition with increasing inter-particle pressure explains the extreme solid-like response of discontinuous shear thickening suspensions. However, analysis of macroscopic discontinuous shear thickening flow in geometries other than the standard rheometry tools remain scarce. Here we use a Hele-Shaw cell geometry to visualise

  • 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

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