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  • Nonlinear propagating modes beyond the phonons in fluorite-structured crystals
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-27
    Matthew S. Bryan; Lyuwen Fu; Karl Rickert; David Turner; Timothy A. Prusnick; J. Matthew Mann; Douglas L. Abernathy; Chris A. Marianetti; Michael E. Manley

    The vibrational energy of crystals is known to propagate in a fixed number of phonon branches allowed by symmetry. In the realm of nonlinear dynamics, however, additional nonlinear propagating modes are possible. Nonlinear propagating modes have unique properties that are important in many disciplines including optical communications, conducting polymers, biology, magnetism, and nuclear physics. Yet

  • Entropic thermodynamics of nonlinear photonic chain networks
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-27
    Fan O. Wu; Pawel S. Jung; Midya Parto; Mercedeh Khajavikhan; Demetrios N. Christodoulides

    The convoluted nonlinear behaviors of heavily multimode photonic structures have been recently the focus of considerable attention. The sheer complexity associated with such multimode systems, allows them to display a host of phenomena that are otherwise impossible in few-mode settings. At the same time, however, it introduces a set of fundamental challenges in terms of comprehending and harnessing

  • The 1995-2018 global evolution of the network of amicable and hostile relations among nation-states
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-23
    Omid Askarisichani; Ambuj K. Singh; Francesco Bullo; Noah E. Friedkin

    There has been longstanding interest in the evolution of positive and negative relationships among countries. An interdisciplinary field of study, Structural Balance Theory, has developed on the dynamics of such appraisal systems. However, the advancement of research in the field has been impeded by the lack of longitudinal empirical data on large-scale networks. We construct the networks of international

  • Enhancing second-harmonic generation with electron spill-out at metallic surfaces
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-20
    Muhammad Khalid; Cristian Ciracì

    Second-order nonlinear optical processes do not manifest in the bulk of centrosymmetric materials, but may occur in the angstroms-thick layer at surfaces. At such length scales, quantum mechanical effects come into play which could be crucial for an accurate description of plasmonic systems. In this article, we develop a theoretical model based on the quantum hydrodynamic description to study free-electron

  • Conservation of angular momentum in second harmonic generation from under-dense plasmas
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-19
    Chen-Kang Huang; Chaojie Zhang; Zan Nie; Kenneth A. Marsh; Chris E. Clayton; Chandrashekhar Joshi

    Spin and orbital angular momentum of an optical beam are two independent parameters that exhibit distinct effects on mechanical objects. However, when laser beams with angular momentum interact with plasmas, one can observe the interplay between the spin and the orbital angular momentum. Here, by measuring the helical phase of the second harmonic 2ω radiation generated in an underdense plasma using

  • Polarization-selective modulation of supercavity resonances originating from bound states in the continuum
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-18
    Chan Kyaw; Riad Yahiaoui; Joshua A. Burrow; Viet Tran; Kyron Keelen; Wesley Sims; Eddie C. Red; Willie S. Rockward; Mikkel A. Thomas; Andrew Sarangan; Imad Agha; Thomas A. Searles

    Bound states in the continuum (BICs) are widely studied for their ability to confine light, produce sharp resonances for sensing applications and serve as avenues for lasing action with topological characteristics. Primarily, the formation of BICs in periodic photonic band gap structures are driven by symmetry incompatibility; structural manipulation or variation of incidence angle from incoming light

  • Optomechanical resonator-enhanced atom interferometry
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-13
    Logan L. Richardson; Ashwin Rajagopalan; Henning Albers; Christian Meiners; Dipankar Nath; Christian Schubert; Dorothee Tell; Étienne Wodey; Sven Abend; Matthias Gersemann; Wolfgang Ertmer; Ernst M. Rasel; Dennis Schlippert; Moritz Mehmet; Lee Kumanchik; Luis Colmenero; Ruven Spannagel; Claus Braxmaier; Felipe Guzmán

    Matter-wave interferometry and spectroscopy of optomechanical resonators offer complementary advantages. Interferometry with cold atoms is employed for accurate and long-term stable measurements, yet it is challenged by its dynamic range and cyclic acquisition. Spectroscopy of optomechanical resonators features continuous signals with large dynamic range, however it is generally subject to drifts.

  • Emergence of quasiparticles in a doped Mott insulator
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-13
    Yao Wang; Yu He; Krzysztof Wohlfeld; Makoto Hashimoto; Edwin W. Huang; Donghui Lu; Sung-Kwan Mo; Seiki Komiya; Chunjing Jia; Brian Moritz; Zhi-Xun Shen; Thomas P. Devereaux

    How a Mott insulator develops into a weakly coupled metal upon doping is a central question to understanding various emergent correlated phenomena. To analyze this evolution and its connection to the high-Tc cuprates, we study the single-particle spectrum for the doped Hubbard model using cluster perturbation theory on superclusters. Starting from extremely low doping, we identify a heavily renormalized

  • Non-Hermitian effects of the intrinsic signs in topologically ordered wavefunctions
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-13
    Qi Zhang; Wen-Tao Xu; Zi-Qi Wang; Guang-Ming Zhang

    Negative signs in many-body wavefunctions play an important role in quantum mechanics because interference relies on cancellation between amplitudes of opposite signs. The ground-state wavefunction of double semion model contains negative signs that cannot be removed by any local transformation. Here we study the quantum effects of these intrinsic negative signs. By proposing a generic double semion

  • Optical wave-packet with nearly-programmable group velocities
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-13
    Zhaoyang Li; Junji Kawanaka

    During the process of Bessel beam generation in free space, spatiotemporal optical wave-packets with tunable group velocities and accelerations can be created by deforming pulse-fronts of injected pulsed beams. So far, only one determined motion form (superluminal or luminal or subluminal for the case of group velocity; and accelerating or uniform-motion or decelerating for the case of acceleration)

  • A phononic crystal coupled to a transmission line via an artificial atom
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-10
    Aleksey N. Bolgar; Daniil D. Kirichenko; Rais. S. Shaikhaidarov; Shtefan V. Sanduleanu; Alexander V. Semenov; Aleksey Yu. Dmitriev; Oleg V. Astafiev

    The interaction of superconducting qubits with surface acoustic wave resonators in quantum regime has been achieved recently. It opens a new field of research – quantum acoustodynamics – and allows developing new types of quantum devices. The main challenge in this direction is to manufacture acoustic resonators in the gigahertz range. Here, we demonstrate that the structure of a hybrid acoustodynamic

  • Photoinduced metastable dd -exciton-driven metal-insulator transitions in quasi-one-dimensional transition metal oxides
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-10
    Teguh Citra Asmara; Frank Lichtenberg; Florian Biebl; Tao Zhu; Pranab Kumar Das; Muhammad Avicenna Naradipa; Angga Dito Fauzi; Caozheng Diao; Ping Yang; Philipp Lenzen; Sören Buchenau; Benjamin Grimm-Lebsanft; Dongyang Wan; Paolo E. Trevisanutto; Mark B. H. Breese; T. Venkatesan; Michael Rübhausen; Andrivo Rusydi

    Photoinduced phase transitions in matters have gained tremendous attention over the past few years. However, their ultrashort lifetime makes their study and possible control very challenging. Here, we report on highly anisotropic d-d excitonic excitations yielding photoinduced metal-insulator transitions (MITs) in quasi-one-dimensional metals Sr1-yNbOx using Mueller-Matrix spectroscopic ellipsometry

  • Signatures of optical phase transitions in superradiant and subradiant atomic arrays
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-09
    Christopher D. Parmee; Janne Ruostekoski

    Resonant light interacting with matter supports different phases of a polarisable medium, and optical bistability where two phases coexist. Such phases have previously been actively studied in cavities. Here, we identify signatures of optical phase transitions and optical bistability mapped onto scattered light in free-space planar arrays of cold atoms. Methods on how to explore such systems in superradiant

  • A shape-switch-block method for confocal light-sheet microscopy with sectioned Bessel beams and stimulated emission depletion
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-06
    Luis Köbele; Alexander Rohrbach

    Microscopy seeks to simultaneously maximize optical resolution, contrast, speed, volume size, and probe tolerability, which is possible by combining different complementary imaging techniques with their specific strengths. Here, we show how to combine three physical concepts to increase resolution and contrast in light-sheet microscopy by making the effective light-sheet thinner through phase shaping

  • Pulse-onset dynamics in a bidirectional mode-locked fibre laser via instabilities
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-06
    Igor Kudelin; Srikanth Sugavanam; Maria Chernysheva

    Real-time observation of the emergence of coherent structures from noise via instabilities is of particular interest across disciplines ranging from biology to astrophysics. In the context of photonics, ultrafast fibre lasers provide an ideal test-bed for experimental observation of dynamical instabilities and generation of coherent structures of ultrashort pulses. Here we present experimentally obtained

  • Leveraging the orthogonality of Zernike modes for robust free-space optical communication
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-06
    Santanu Konwar; Bosanta R. Boruah

    Free-space optical communication systems exploit the properties of light beams to transfer information through a free-space link. Indeed such systems provide an exciting alternative for communication. Here we introduce information transfer through free-space using a laser beam having its phase encoded with multiple orthogonal aberration modes. We use Zernike polynomials, which form a complete basis

  • The impact of travel and timing in eliminating COVID-19
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-06
    Alexander F. Siegenfeld; Yaneer Bar-Yam

    While the spread of communicable diseases such as coronavirus disease 2019 (COVID-19) is often analyzed assuming a well-mixed population, more realistic models distinguish between transmission within and between geographic regions. A disease can be eliminated if the region-to-region reproductive number—i.e., the average number of other regions to which a single infected region will transmit the disease—is

  • Topological Josephson heat engine
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-04
    Benedikt Scharf; Alessandro Braggio; Elia Strambini; Francesco Giazotto; Ewelina M. Hankiewicz

    Topological superconductors represent a fruitful playing ground for fundamental research as well as for potential applications in fault-tolerant quantum computing. Especially Josephson junctions based on topological superconductors remain intensely studied, both theoretically and experimentally. The characteristic property of these junctions is their 4π-periodic ground-state fermion parity in the superconducting

  • Quantum phase transitions and the role of impurity-substrate hybridization in Yu-Shiba-Rusinov states
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-04
    Haonan Huang; Robert Drost; Jacob Senkpiel; Ciprian Padurariu; Björn Kubala; Alfredo Levy Yeyati; Juan Carlos Cuevas; Joachim Ankerhold; Klaus Kern; Christian R. Ast

    Spin-dependent scattering from magnetic impurities inside a superconductor gives rise to Yu-Shiba-Rusinov (YSR) states within the superconducting gap. They can be modeled by the largely equivalent Kondo or Anderson impurity models. The role of the magnetic and nonmagnetic properties of the impurity in relation to the coupling to the substrate is still under debate. Here, we use a scanning tunneling

  • Cooperative origin of proton pair diffusivity in yttrium substituted barium zirconate
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-04
    Peng Du; Qianli Chen; Zhijun Fan; Huizhu Pan; Frederick G. Haibach; Maria A. Gomez; Artur Braun

    Proton conduction is an important property for fuel cell electrolytes. The search for molecular details on proton transport is an ongoing quest. Here, we show that in hydrated yttrium doped barium zirconate using X-ray and neutron diffraction that protons tend to localize near the dopant yttrium as a conjugated superstructure. The proton jump time measured using quasi-elastic neutron scattering follows

  • Observation of nonlinear dynamics in an optical levitation system
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-04
    Jinyong Ma; Jiayi Qin; Geoff T. Campbell; Giovanni Guccione; Ruvi Lecamwasam; Ben C. Buchler; Ping Koy Lam

    Optical levitation of mechanical oscillators has been suggested as a promising way to decouple the environmental noise and increase the mechanical quality factor. Here, we investigate the dynamics of a free-standing mirror acting as the top reflector of a vertical optical cavity, designed as a testbed for a tripod cavity optical levitation setup. To reach the regime of levitation for a milligram-scale

  • A thermal fluid dynamics framework applied to multi-component substrates experiencing fusion and vaporisation state transitions
    Commun. Phys. (IF 4.684) Pub Date : 2020-11-03
    Thomas F. Flint; Lucia Scotti; Hector C. Basoalto; Michael C. Smith

    The fluid dynamics of multi-component alloy systems subjected to high energy density sources of heat largely determines the local composition, microstructure, and material properties. In this work a multi-component thermal fluid dynamics framework is presented for the prediction of alloy system development due to melting, vaporisation, condensation and solidification phenomena. A volume dilation term

  • Beating absorption in solid-state high harmonics
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-30
    Hanzhe Liu; Giulio Vampa; Jingyuan Linda Zhang; Yu Shi; Siddharth Buddhiraju; Shanhui Fan; Jelena Vuckovic; Philip H. Bucksbaum; David A. Reis

    Since the new millennium coherent extreme ultra-violet and soft x-ray radiation has revolutionized the understanding of dynamical physical, chemical and biological systems at the electron’s natural timescale. Unfortunately, coherent laser-based upconversion of infrared photons to vacuum-ultraviolet and soft x-ray high-order harmonics in gaseous, liquid and solid targets is notoriously inefficient.

  • Driving positron beam acceleration with coherent transition radiation
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-30
    Zhangli Xu; Longqing Yi; Baifei Shen; Jiancai Xu; Liangliang Ji; Tongjun Xu; Lingang Zhang; Shun Li; Zhizhan Xu

    Positron acceleration in plasma wakefield faces significant challenges, as the positron beam must be pre-generated and precisely coupled into the wakefield and, most critically, suffers from defocusing issues. Here we propose a scheme that utilizes laser-driven electrons to produce, inject, and accelerate positrons in a single setup. The high-charge electron beam from wakefield acceleration creates

  • Excitons, trions and Rydberg states in monolayer MoS 2 revealed by low-temperature photocurrent spectroscopy
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-30
    Daniel Vaquero; Vito Clericò; Juan Salvador-Sánchez; Adrián Martín-Ramos; Elena Díaz; Francisco Domínguez-Adame; Yahya M. Meziani; Enrique Diez; Jorge Quereda

    Exciton physics in two-dimensional semiconductors are typically studied by photoluminescence spectroscopy. However, this technique does not allow for direct observation of non-radiating excitonic transitions. Here, we use low-temperature photocurrent spectroscopy as an alternative technique to investigate excitonic transitions in a high-quality monolayer MoS2 phototransistor. The resulting spectra

  • Large electromechanical strain and unconventional domain switching near phase convergence in a Pb-free ferroelectric
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-30
    Sarangi Venkateshwarlu; Lalitha K. Venkataraman; Valentin Segouin; Frederick P. Marlton; Ho Chin Hin; Dmitry Chernyshov; Yang Ren; Mads R. V. Jørgensen; Sanjib Nayak; Jürgen Rödel; Laurent Daniel; Abhijit Pramanick

    In many ferroelectrics, large electromechanical strains are observed near regions of composition- or temperature- driven phase coexistence. Phenomenologically, this is attributed to easy re-orientation of the polarization vector and/or phase transition, although their effects are highly convoluted and difficult to distinguish experimentally. Here, we used synchrotron X-ray scattering and digital image

  • Modeling synchronization in forced turbulent oscillator flows
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-30
    Benjamín Herrmann; Philipp Oswald; Richard Semaan; Steven L. Brunton

    Periodically forced, oscillatory fluid flows have been the focus of intense research for decades due to their richness as a nonlinear dynamical system and their relevance to applications in transportation, aeronautics, and energy conversion. Here we derive a mechanistic model of the dynamics of forced turbulent oscillator flows by leveraging a comprehensive experimental study of the turbulent wake

  • Walker-like domain wall breakdown in layered antiferromagnets driven by staggered spin–orbit fields
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-29
    Rubén M. Otxoa; P. E. Roy; R. Rama-Eiroa; J. Godinho; K. Y. Guslienko; J. Wunderlich

    Within linear continuum theory, no magnetic texture can propagate faster than the maximum group velocity of the spin waves. Here, by atomistic spin dynamics simulations and supported by analytical theory, we report that a strongly non-linear transient regime due to the appearance of additional magnetic textures results in the breaking of the Lorentz translational invariance. This dynamical regime is

  • Coulomb drag transistor using a graphene and MoS 2 heterostructure
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-27
    Youngjo Jin; Min-Kyu Joo; Byoung Hee Moon; Hyun Kim; Sanghyup Lee; Hye Yun Jeong; Young Hee Lee

    Two-dimensional (2D) heterostructures often provide extraordinary carrier transport as exemplified by superconductivity or excitonic superfluidity. Recently, a double-layer graphene (Gr) separated by few-layered boron nitride demonstrated the Coulomb drag phenomenon: carriers in the active layer drag carriers in the passive layer. Here, we propose high-performance Gr/MoS2 heterostructure transistors

  • Bi-reflection of spin waves
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-27
    Tomosato Hioki; Yusuke Hashimoto; Eiji Saitoh

    When a light wave is refracted at a boundary between two different media, it may split into two rays due to optical anisotropy, a phenomenon called birefringence. On the other hand, for a reflected light wave in an ordinary medium, the angle of reflection is always the same as the incident angle as expected from the law of reflection. Here, we report the observation of a split of reflected spin-waves

  • Spin–orbit torque nano-oscillator with giant magnetoresistance readout
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-23
    Jen-Ru Chen; Andrew Smith; Eric A. Montoya; Jia G. Lu; Ilya N. Krivorotov

    Spin-orbit torque nano-oscillators based on bilayers of ferromagnetic and nonmagnetic metals are ultra-compact current-controlled microwave signal sources. They are attractive for practical applications such as microwave assisted magnetic recording, neuromorphic computing, and chip-to-chip wireless communications. However, a major drawback of these devices is low output microwave power arising from

  • Active magnetocaloric heat pipes provide enhanced specific power of caloric refrigeration
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-22
    Lena Maria Maier; Patrick Corhan; Alexander Barcza; Hugo A. Vieyra; Christian Vogel; Jan D. Koenig; Olaf Schäfer-Welsen; Jürgen Wöllenstein; Kilian Bartholomé

    Today almost all refrigeration systems are based on compressors, which often require harmful refrigerants and typically reach 50% of the Carnot efficiency. Caloric cooling systems do not need any detrimental fluids and are expected to reach 60–70% of the Carnot limit. Current caloric systems utilise the active magnetocaloric regeneration principle and are quite cost-intensive, as it is challenging

  • Dynamical decoupling of laser phase noise in compound atomic clocks
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-20
    Sören Dörscher; Ali Al-Masoudi; Marcin Bober; Roman Schwarz; Richard Hobson; Uwe Sterr; Christian Lisdat

    The frequency stability of many optical atomic clocks is limited by the coherence of their local oscillator. Here, we present a measurement protocol that overcomes the laser coherence limit. It relies on engineered dynamical decoupling of laser phase noise and near-synchronous interrogation of two clocks. One clock coarsely tracks the laser phase using dynamical decoupling; the other refines this estimate

  • Probing light-driven quantum materials with ultrafast resonant inelastic X-ray scattering
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-19
    Matteo Mitrano; Yao Wang

    Ultrafast optical pulses are an increasingly important tool for controlling quantum materials and triggering novel photo-induced phase transitions. Understanding these dynamic phenomena requires a probe sensitive to spin, charge, and orbital degrees of freedom. Time-resolved resonant inelastic X-ray scattering (trRIXS) is an emerging spectroscopic method, which responds to this need by providing unprecedented

  • Aspiration-assisted freeform bioprinting of pre-fabricated tissue spheroids in a yield-stress gel
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-16
    Bugra Ayan; Nazmiye Celik; Zhifeng Zhang; Kui Zhou; Myoung Hwan Kim; Dishary Banerjee; Yang Wu; Francesco Costanzo; Ibrahim T. Ozbolat

    Bioprinting of cellular aggregates, such as tissue spheroids, to form three-dimensional (3D) complex-shaped arrangements, has posed a major challenge due to lack of robust, reproducible and practical bioprinting techniques. Here, we demonstrate 3D aspiration-assisted freeform bioprinting of tissue spheroids by precisely positioning them in self-healing yield-stress gels, enabling the self-assembly

  • Transversally travelling ultrasound for light guiding deep into scattering media
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-15
    Maxim N. Cherkashin; Carsten Brenner; Georg Schmitz; Martin R. Hofmann

    The application of optical methods for tissue diagnosis, activation, and treatment suffers dramatically from the low accessible depths due to strong light scattering in tissues. Here we demonstrate a method to address this issue by utilizing transient ultrasound waves, travelling transversally to the light propagation direction, to guide light into deeper tissue regions. We study the formation of the

  • Quantum-critical scale invariance in a transition metal alloy
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-15
    Yasuyuki Nakajima; Tristin Metz; Christopher Eckberg; Kevin Kirshenbaum; Alex Hughes; Renxiong Wang; Limin Wang; Shanta R. Saha; I-Lin Liu; Nicholas P. Butch; Daniel Campbell; Yun Suk Eo; David Graf; Zhonghao Liu; Sergey V. Borisenko; Peter Y. Zavalij; Johnpierre Paglione

    Quantum-mechanical fluctuations between competing phases induce exotic collective excitations that exhibit anomalous behavior in transport and thermodynamic properties, and are often intimately linked to the appearance of unconventional Cooper pairing. High-temperature superconductivity, however, makes it difficult to assess the role of quantum-critical fluctuations in shaping anomalous finite-temperature

  • Author Correction: Laser cooling of ytterbium-doped silica glass
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-13
    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

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

  • Filtering spins by scattering from a lattice of point magnets
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-09
    Areg Ghazaryan; Mikhail Lemeshko; Artem G. Volosniev

    Nature creates electrons with two values of the spin projection quantum number. In certain applications, it is important to filter electrons with one spin projection from the rest. Such filtering is not trivial, since spin-dependent interactions are often weak, and cannot lead to any substantial effect. Here we propose an efficient spin filter based upon scattering from a two-dimensional crystal, which

  • Generative machine learning for robust free-space communication
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-09
    Sanjaya Lohani; Erin M. Knutson; Ryan T. Glasser

    Free-space optical communications systems suffer from turbulent propagation of light through the atmosphere, attenuation, and receiver detector noise. These effects degrade the quality of the received state, increase cross-talk, and decrease symbol classification accuracy. We develop a state-of-the-art generative neural network (GNN) and convolutional neural network (CNN) system in combination, and

  • Parametric dependence of hot electron relaxation timescales on electron-electron and electron-phonon interaction strengths
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-09
    Richard B. Wilson; Sinisa Coh

    Understanding how photoexcited electron dynamics depend on electron-electron (e-e) and electron-phonon (e-p) interaction strengths is important for many fields, e.g. ultrafast magnetism, photocatalysis, plasmonics, and others. Here, we report simple expressions that capture the interplay of e-e and e-p interactions on electron distribution relaxation times. We observe a dependence of the dynamics on

  • Post-merger chirps from binary black holes as probes of the final black-hole horizon
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-08
    Juan Calderon Bustillo; Christopher Evans; James A. Clark; Grace Kim; Pablo Laguna; Deirdre Shoemaker

    The merger of a binary black hole gives birth to a highly distorted final black hole. The gravitational radiation emitted as this black hole relaxes presents us with the unique opportunity to probe extreme gravity and its connection with the dynamics of the black hole horizon. Using numerical relativity simulations, we demonstrate a connection between a concrete observable feature in the gravitational

  • Optical frequency metrology in the bending modes region
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-06
    M. Lamperti; R. Gotti; D. Gatti; M. K. Shakfa; E. Cané; F. Tamassia; P. Schunemann; P. Laporta; A. Farooq; M. Marangoni

    Optical metrology and high-resolution spectroscopy, despite impressive progress across diverse regions of the electromagnetic spectrum from ultraviolet to terahertz frequencies, are still severely limited in the region of vibrational bending modes from 13 to 20 µm. This long-wavelength part of the mid-infrared range remains largely unexplored due to the lack of tunable single-mode lasers. Here, we

  • Axon hillock currents enable single-neuron-resolved 3D reconstruction using diamond nitrogen-vacancy magnetometry
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-02
    Madhur Parashar; Kasturi Saha; Sharba Bandyopadhyay

    Sensing neuronal action potential associated magnetic fields (APMFs) is an emerging viable alternative of functional brain mapping. Measurement of APMFs of large axons of worms have been possible due to their size. In the mammalian brain, axon sizes, their numbers and routes, restricts using such functional imaging methods. With a segmented model of mammalian pyramidal neurons, we show that the APMF

  • Unbiased description of magnetic polarons in a Mott insulator
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-01
    Emil Blomquist; Johan Carlström

    Polarons are among the most elementary quasiparticles of interacting quantum matter, consisting of a charge carrier dressed by an excited background. In Mott insulators, they take the form of a dopant surrounded by a distorted spin-background. Despite the fundamental importance of polarons for the electronic structure of strongly correlated systems, access to their internal structure was only recently

  • Interplay of filling fraction and coherence in symmetry broken graphene p-n junction
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-01
    Arup Kumar Paul; Manas Ranjan Sahu; Chandan Kumar; Kenji Watanabe; Takashi Taniguchi; Anindya Das

    Graphene p–n junction (PNJ) with co-propagating spin-valley polarized quantum Hall (QH) edges is a promising platform for studying electron interferometry. Though several conductance measurements have been attempted for such PNJs, the edge dynamics of the spin-valley symmetry broken edge states remain unexplored. In this work, we present the measurements of conductance together with shot noise, an

  • Oxygen sensing ability of positronium atom for tumor hypoxia imaging
    Commun. Phys. (IF 4.684) Pub Date : 2020-10-01
    Kengo Shibuya; Haruo Saito; Fumihiko Nishikido; Miwako Takahashi; Taiga Yamaya

    Positronium (Ps), a hydrogen-like atom consisting of a positron and an electron, is efficiently formed in the human body during positron emission tomography (PET) examination, and its decay rate into gamma-ray photons is significantly influenced by the chemical environment, especially the dissolved oxygen concentration (pO2) due to the unpaired electrons. However, the functionality of PET has been

  • Time evolution of transient plasma states from nanowire arrays irradiated at relativistic intensities
    Commun. Phys. (IF 4.684) Pub Date : 2020-09-29
    O. S. Humphries; P. Allan; C. R. D. Brown; L. M. R. Hobbs; S. F. James; M. G. Ramsay; B. Williams; D. J. Hoarty; M. P. Hill; S. M. Vinko

    Understanding the evolution of extreme states of matter driven by relativistic laser-plasma interactions is a fundamental problem in high-field physics. This is especially true for nanostructured targets, where hydrodynamic effects play a key role within the ultra-fast time scale of laser absorption. Nanowire array targets are of particular interest as they provide an efficient means to access the

  • Data-driven prediction and analysis of chaotic origami dynamics
    Commun. Phys. (IF 4.684) Pub Date : 2020-09-25
    Hiromi Yasuda; Koshiro Yamaguchi; Yasuhiro Miyazawa; Richard Wiebe; Jordan R. Raney; Jinkyu Yang

    Advances in machine learning have revolutionized capabilities in applications ranging from natural language processing to marketing to health care. Recently, machine learning techniques have also been employed to learn physics, but one of the formidable challenges is to predict complex dynamics, particularly chaos. Here, we demonstrate the efficacy of quasi-recurrent neural networks in predicting extremely

  • 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

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