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  • A theoretical study of de-charging excitations of the NV-center in diamond involving a nitrogen donor
    New J. Phys. (IF 3.539) Pub Date : 2021-01-05
    R Löfgren, S Öberg and J A Larsson

    The negatively charged nitrogen vacancy centre in diamond is a promising candidate for future nanoscale quantum applications. For its operation it is important to have control of the centres charge state, and to avoid temporary disappearance of the NV-center’s functionality, termed photo-blinking. In this work, we use density functional theory simulations to investigate excitations that result in loss

    更新日期:2021-01-06
  • Light interaction with extended quantum systems in dispersive media
    New J. Phys. (IF 3.539) Pub Date : 2020-12-31
    Giovanni Scala, Francesco V Pepe, Paolo Facchi, Saverio Pascazio and Karolina Słowik

    We derive a light–matter interaction Hamiltonian to describe a quantum system embedded in a dispersive environment and coupled with the electromagnetic field. We include in this theory the spatial extension of the system, taken into account through its wavefunction. This enables us to overcome the divergence problem of the Green tensor propagator that arises from a point-like approximation of the quantum

    更新日期:2021-01-02
  • Integrable active atom interferometry
    New J. Phys. (IF 3.539) Pub Date : 2020-12-31
    Michael Kastner, Vincent Menet and Johannes N Kriel

    Active interferometers are designed to enhance phase sensitivity beyond the standard quantum limit by generating entanglement inside the interferometer. An atomic version of such a device can be constructed by means of a spinor Bose–Einstein condensate with an F = 1 groundstate manifold in which spin-changing collisions (SCCs) create entangled pairs of m = ±1 atoms. We use Bethe Ansatz techniques to

    更新日期:2021-01-02
  • How to switch between relational quantum clocks
    New J. Phys. (IF 3.539) Pub Date : 2020-12-31
    Philipp A Höhn and Augustin Vanrietvelde

    Every clock is a physical system and thereby ultimately quantum. A naturally arising question is thus how to describe time evolution relative to quantum clocks and, specifically, how the dynamics relative to different quantum clocks are related. This is a particularly pressing issue in view of the multiple choice facet of the problem of time in quantum gravity, which posits that there is no distinguished

    更新日期:2021-01-02
  • Coherence protection and decay mechanism in qubit ensembles under concatenated continuous driving
    New J. Phys. (IF 3.539) Pub Date : 2020-12-31
    WangGuoqing0000-0002-1822-8121, LiuYi-Xiang0000-0001-7798-1028 and Paola Cappellaro

    Dense ensembles of spin qubits are valuable for quantum applications, even though their coherence protection remains challenging. Continuous dynamical decoupling can protect ensemble qubits from noise while allowing gate operations, but it is hindered by the additional noise introduced by the driving. Concatenated continuous driving (CCD) techniques can, in principle, mitigate this problem. Here we

    更新日期:2021-01-02
  • Control power of quantum channels is not multiplicative
    New J. Phys. (IF 3.539) Pub Date : 2020-12-31
    Tie-jun Wang and Shohini Ghose

    We construct a family of parallel channels for controlled quantum communication, and show that the control power of a quantum channel can become larger when it is combined with a zero control power channel. As a consequence, we demonstrate for the first time that control power is non-multiplicative. In contrast to previous results which indicated that increasing control power requires the consumption

    更新日期:2021-01-02
  • Analysis of nonclassical features in a coupled macroscopic binary system
    New J. Phys. (IF 3.539) Pub Date : 2020-12-31
    Byoung S Ham

    Nonclassical phenomena of quantum mechanics such as anticorrelation and photonic de Broglie waves (PBWs) have been recently understood as a special case of coherence optics with a particular phase relation between orthogonal bases composing a classical system. Such a macroscopic understanding of nonclassical features has also been confirmed experimentally for a coherence version of PBWs in a doubly-coupled

    更新日期:2021-01-02
  • Work relation in instantaneous-equilibrium transition of forward and reverse processes
    New J. Phys. (IF 3.539) Pub Date : 2020-12-31
    John A C Albay, Chulan Kwon, Pik-Yin Lai and Yonggun Jun

    Realizing quasistatic processes in finite times requires additional control parameters to keep the system in instantaneous equilibrium (ieq). However, the finite-rate ieq transition of the reverse process is not just the time-reversal of the ieq forward process due to the odd-parity of controlling parameters. We theoretically show a work relation that the dissipated work of the ieq transition of the

    更新日期:2021-01-02
  • Irreversibility, heat and information flows induced by non-reciprocal interactions
    New J. Phys. (IF 3.539) Pub Date : 2020-12-31
    Sarah A M Loos and Sabine H L Klapp

    We study the thermodynamic properties induced by non-reciprocal interactions between stochastic degrees of freedom in time- and space-continuous systems. We show that, under fairly general conditions, non-reciprocal coupling alone implies a steady energy flow through the system, i.e., non-equilibrium. Projecting out the non-reciprocally coupled degrees of freedom renders non-Markovian, one-variable

    更新日期:2021-01-02
  • Effective elastic wave characteristics of composite media
    New J. Phys. (IF 3.539) Pub Date : 2020-12-31
    J Kim and S Torquato

    We derive exact expressions for effective elastodynamic properties of two-phase composites in the long-wavelength (quasistatic) regime via homogenized constitutive relations that are local in space. This is accomplished by extending the ‘strong-contrast’ expansion formalism that was previously applied to the static problem. These strong-contrast expansions explicitly incorporate complete microstructural

    更新日期:2021-01-02
  • Digital quantum simulation framework for energy transport in an open quantum system
    New J. Phys. (IF 3.539) Pub Date : 2020-12-25
    Pragati Gupta and C M Chandrashekar

    Quantum effects such as the environment assisted quantum transport (ENAQT) displayed in photosynthetic Fenna–Mathews–Olson (FMO) complex has been simulated on analog quantum simulators. Digital quantum simulations offer greater universality and flexibility over analog simulations. However, digital quantum simulations of open quantum systems face a theoretical challenge; one does not know the solutions

    更新日期:2020-12-28
  • Extreme-value statistics of stochastic transport processes
    New J. Phys. (IF 3.539) Pub Date : 2020-12-25
    Alexandre Guillet, Edgar Roldán and Frank Jülicher

    We derive exact expressions for the finite-time statistics of extrema (maximum and minimum) of the spatial displacement and the fluctuating entropy flow of biased random walks. Our approach captures key features of extreme events in molecular motor motion along linear filaments. For one-dimensional biased random walks, we derive exact results which tighten bounds for entropy production extrema obtained

    更新日期:2020-12-28
  • Particle scattering and resonances involving avoided crossing
    New J. Phys. (IF 3.539) Pub Date : 2020-12-22
    Yu Kun Yang, Yongjun Cheng, Yong Wu, Yi Zhi Qu, Jian Guo Wang and Song Bin Zhang

    In molecules, the nonadiabatic couplings between two adiabatic potentials build the avoided crossing (AC) region. The rovibronic resonances in the AC region of two-coupled potentials are very special, since they are not in the bound state region of the adiabatic potentials, and they usually do not play important roles on the scatterings and are less discussed. Exemplified in particle scattering, resonances

    更新日期:2020-12-22
  • Double explosive transitions to synchronization and cooperation in intertwined dynamics and evolutionary games
    New J. Phys. (IF 3.539) Pub Date : 2020-12-22
    Xuelong Li, Xiangfeng Dai, Danyang Jia, Hao Guo, Shudong Li, Garth D Cooper, Karin Alfaro-Bittner, MatjaŽ Perc, Stefano Boccaletti and Zhen Wang

    Collective behavior, from murmurations to synchronized beating of heart cells, governs some of the most beautiful and important aspects of nature. Likewise, cooperation—the act of sacrificing personal benefits for the common good—is one of the pillars of social evolution, and it is the basis for the emergence of collective organized actions from single-cell organisms to modern human societies. Here

    更新日期:2020-12-22
  • Dynamics of self-propelled particles passing a bottleneck
    New J. Phys. (IF 3.539) Pub Date : 2020-12-22
    Mahdieh Mohammadi, Kirsten Harth, Dmitry Puzyrev, Tina Hanselka, Torsten Trittel and Ralf Stannarius

    We study the passage of active and passive granular particles through a bottleneck under gravitational bias. The grains are pharmaceutical capsules with spherocylindrical shapes on a vibrating table. The vibrating ground plate is slightly tilted in order to break the in-plane symmetry and to give particles a motivation to move in a preferential direction. The passage through a narrow gate with openings

    更新日期:2020-12-22
  • Stationary Gaussian entanglement between levitated nanoparticles
    New J. Phys. (IF 3.539) Pub Date : 2020-12-22
    Anil Kumar Chauhan, Ondřej Černotík and Radim Filip

    Coherent scattering of photons is a novel mechanism of optomechanical coupling for optically levitated nanoparticles promising strong, versatile interactions with light and between nanoparticles. We show that it allows efficient deterministic generation of Gaussian entanglement between two particles in separate tweezers. A combination of red- and blue-detuned tweezers brings a mechanical Bogoliubov

    更新日期:2020-12-22
  • Photoemission from the gas phase using soft x-ray fs pulses: an investigation of the space-charge effects
    New J. Phys. (IF 3.539) Pub Date : 2020-12-22
    Adriano Verna, Giovanni Stefani, Francesco Offi, Tatsuo Gejo, Yoshihito Tanaka, Kenta Tanaka, Tatsuru Nishie, Kiyonobu Nagaya, Akinobu Niozu, Ryosuke Yamamura, Taiga Suenaga, Osamu Takahashi, Hikaru Fujise, Tadashi Togashi, Makina Yabashi and Masaki Oura

    An experimental and computational investigation of the space-charge effects occurring in ultrafast photoelectron spectroscopy from the gas phase is presented. The target sample CF 3 I is excited by ultrashort (100 fs) far-ultraviolet radiation pulses produced by a free-electron laser. The modification of the energy distribution of the photoelectrons, i.e. the shift and broadening of the spectral structures

    更新日期:2020-12-22
  • Generalized exceptional quantum walk search
    New J. Phys. (IF 3.539) Pub Date : 2020-12-22
    Meng Li and Yun Shang

    We mainly study exceptional configuration for coined quantum walk search. For searching on a two-dimensional grid by AKR algorithm, we find some new classes of exceptional configurations that cannot be found by the AKR algorithm effectively and the known diagonal configuration can be regarded as its special case. Meanwhile, we give two modified quantum walk models that can improve the success probability

    更新日期:2020-12-22
  • Dynamical formation of a magnetic polaron in a two-dimensional quantum antiferromagnet
    New J. Phys. (IF 3.539) Pub Date : 2020-12-22
    A Bohrdt, F Grusdt and M Knap

    Tremendous recent progress in the quantum simulation of the Hubbard model paves the way to controllably study doped antiferromagnetic Mott insulators. Motivated by these experimental advancements, we numerically study the real-time dynamics of a single hole created in an antiferromagnet on a square lattice, as described by the t – J model. Initially, the hole spreads ballistically with a velocity proportional

    更新日期:2020-12-22
  • Experimental demonstration of enhanced acoustic energy harvesting with a subwavelength metamaterial plate
    New J. Phys. (IF 3.539) Pub Date : 2020-12-22
    Zheng Zhang, Qiuyu Li, Mourad Oudich, Yongdong Pan and Yong Li

    In this work, we propose an acoustic energy harvesting metamaterial consisting of an array of silicone rubber pillars and a PZT patch deposited on an ultrathin aluminum plate with several holes based on locally resonant mechanism. The resonance is formed by removing four pillars, drilling a few of holes and attaching the PZT patch on the aluminum plate. The strain energy originating from an incident

    更新日期:2020-12-22
  • Dynamic focusing of laser driven positron jets by self-generated fields
    New J. Phys. (IF 3.539) Pub Date : 2020-12-22
    J Kim, A Link, D Canning, P Fitzsimmons, J A Fooks, S Kerr, T Ma, M J-E Manuel, D Mariscal, R Wallace, G J Williams, L Willingale, F N Beg and H Chen

    Focusing effect of laser-driven positron jets by self-generated target sheath fields has been observed for the first time experimentally and the results are supported by the computational studies. In the experiment, OMEGA EP short-pulse (0.7 ps, 500 J) irradiates mm-size gold targets with a concave back surface and reference flat-surface targets. Both targets exhibited positrons with quasi-monoenergetic

    更新日期:2020-12-22
  • New supercurrent pattern in quantum point contact with strained graphene nanoribbon
    New J. Phys. (IF 3.539) Pub Date : 2020-12-22
    Leyla Majidi and Reza Asgari

    We theoretically reveal the unusual features of the Josephson effect in a strained zigzag graphene nanoribbon with a small length relative to the superconducting coherence length and an arbitrary width. We find a step-wise variation of the critical supercurrent with the width of the nanoribbon, showing additional small width plateaus placed between the broad steps of an unstrained structure. We further

    更新日期:2020-12-22
  • Coupling between rotational and translational motions of a vibrated polygonal disk
    New J. Phys. (IF 3.539) Pub Date : 2020-12-22
    Simeon Völkel and Kai Huang

    We investigate experimentally the dynamics of a single polygonal disk (regular n -gon with 3 ⩽ n ⩽ 8) confined in a closed container under vertical vibrations against gravity. The disks tend to precess continuously upon vibrations, transferring mechanical energy into rotational and lateral translational degrees of freedom (DoF). An analysis of the velocity distribution functions in both DoF suggests

    更新日期:2020-12-22
  • Single-site-resolved imaging of ultracold atoms in a triangular optical lattice
    New J. Phys. (IF 3.539) Pub Date : 2020-12-22
    Ryuta Yamamoto, Hideki Ozawa, David C. Nak, Ippei Nakamura and Takeshi Fukuhara

    We demonstrate single-site-resolved fluorescence imaging of ultracold 87 Rb atoms in a triangular optical lattice by employing Raman sideband cooling. Combining a Raman transition at the D1 line and a photon scattering through an optical pumping of the D2 line, we obtain images with low background noise. The Bayesian optimisation of 11 experimental parameters for fluorescence imaging with Raman sideband

    更新日期:2020-12-22
  • Symmetry-protection of multiphoton states of light
    New J. Phys. (IF 3.539) Pub Date : 2020-12-16
    Jon Lasa-Alonso, Martín Molezuelas-Ferreras, J J Miguel Varga, Aitzol García-Etxarri, Géza Giedke and Gabriel Molina-Terriza

    In this manuscript we analyze the emergence of protected multiphoton states in scattering problems with cylindrical symmetry. In order to do that, we first provide a formal definition of the concept of postselected symmetry-protection. We show that the notion of symmetry-protection is not limited to one- or two-photon states, on the contrary, it can be formally extended to the multiphoton case. In

    更新日期:2020-12-16
  • Crystal field model simulations of magnetic response of pairs, triplets and quartets of Mn 3+ ions in GaN
    New J. Phys. (IF 3.539) Pub Date : 2020-12-16
    D Sztenkiel, K Gas, J Z Domagala, D Hommel and M Sawicki

    A ferromagnetic coupling between localized Mn spins was predicted in a series of ab initio and tight binding calculations and experimentally verified for the dilute magnetic semiconductor Ga 1− x Mn x N. In the limit of small Mn concentrations, x ≲ 0.01, the paramagnetic properties of this material were successfully described using a single ion crystal field model approach. In order to obtain the description

    更新日期:2020-12-16
  • Time-reversal symmetry violations and entropy production in field theories of polar active matter
    New J. Phys. (IF 3.539) Pub Date : 2020-12-16
    Øyvind L Borthne, Étienne Fodor and Michael E Cates

    We investigate the steady-state entropy production rate (EPR) in the hydrodynamic Vicsek model (HVM) and diffusive flocking model (DFM). Both models display a transition from an isotropic gas to a polar liquid (flocking) phase, in addition to travelling polar clusters and microphase-separation in the miscibility gap. The phase diagram of the DFM, which may be considered an extension of the HVM, contains

    更新日期:2020-12-16
  • Ab initio investigation of hydrogen-based high T c superconductor that is stable under ambient environment
    New J. Phys. (IF 3.539) Pub Date : 2020-12-16
    Ting Zhang

    We report an ab initio investigation of a hydrogen-based high- T c superconductor candidate—crystalized C 4 H 4 in the cubic-gauche ( cg -C 4 H 4 ) structure, with the symmetry of space group I 213 . We find the cg -C 4 H 4 structure to be stable under ambient environment; and the evaluation of the electron-phonon coupling strength indicates that the heavily doped cg -C 4 H 4 can generate superconductivity

    更新日期:2020-12-16
  • Enhancing photoelectric current by nonclassical light
    New J. Phys. (IF 3.539) Pub Date : 2020-12-16
    Hai-Yan Yao and Sheng-Wen Li

    We study the photoelectric current generated by a driving light with nonclassical photon statistics. Due to the nonclassical input photon statistics, it is no longer enough to treat the driving light as a planar wave as in classical physics. We make a quantum approach to study such problems, and find that: when the driving light starts from a coherent state as the initial state, our quantum treatment

    更新日期:2020-12-16
  • Pressure-induced superconductivity in a shandite compound Pd 3 Pb 2 Se 2 with the Kagome lattice
    New J. Phys. (IF 3.539) Pub Date : 2020-12-16
    F H Yu, X Y Hua, T Chen, J Sun, M Z Shi, W Z Zhuo, D H Ma, H H Wang, J J Ying and X H Chen

    High pressure electric transport and synchrotron x-ray diffraction (XRD) measurements together with the first-principles calculations are performed on a shandite compound Pd 3 Pb 2 Se 2 which contains the Kagome lattice of the transition metal Pd. A pressure-induced superconducting transition is observed above 25 GPa, for the first time in the shandite compounds, although the crystal structure of the

    更新日期:2020-12-16
  • Tailored holograms for superimposed vortex states
    New J. Phys. (IF 3.539) Pub Date : 2020-12-15
    K Eickhoff, D Köhnke, L Feld, L Englert, T Bayer and M Wollenhaupt

    We present the generation, optimization and full control of superimposed optical vortices (SOVs) using tailored computer generated holograms by utilizing a 2D liquid crystal spatial light modulator. To perform full radial and azimuthal control over the targeted SOVs we apply spatial amplitude modulation via window functions as well as radial and azimuthal phases, encoded in the diffraction mask. In

    更新日期:2020-12-16
  • Interacting quantum mixtures for precision atom interferometry
    New J. Phys. (IF 3.539) Pub Date : 2020-12-12
    Robin Corgier, Sina Loriani, Holger Ahlers, Katerine Posso-Trujillo, Christian Schubert, Ernst M Rasel, Eric Charron and Naceur Gaaloul

    We present a source engineering concept for a binary quantum mixture suitable as input for differential, precision atom interferometry with drift times of several seconds. To solve the non-linear dynamics of the mixture, we develop a set of scaling approach equations and verify their validity contrasting it to the one of a system of coupled Gross–Pitaevskii equations. This scaling approach is a generalization

    更新日期:2020-12-13
  • Terahertz tunable optical dual-functional slow light reflector based on gold-graphene metamaterials
    New J. Phys. (IF 3.539) Pub Date : 2020-12-12
    Hui Xu, Zhiquan Chen, Zhihui He, Guozheng Nie and Deqiong Li

    Tunable terahertz optical dual-functional slow light reflector based on gold-graphene metamaterials has been designed and the proposed structure can achieve a good optical reflection effect and slow light effect. The tunable function can be dynamically controlled by applying a voltage to the gold and it can achieve a good effect for selecting reflection band. In more detail, the gold in this device

    更新日期:2020-12-13
  • Time crystals in the driven transverse field Ising model under quasiperiodic modulation
    New J. Phys. (IF 3.539) Pub Date : 2020-12-11
    Pengfei Liang, Rosario Fazio and Stefano Chesi

    We investigate the transverse field Ising model subject to a two-step periodic driving protocol and quasiperiodic modulation of the Ising couplings. Analytical results on the phase boundaries associated with Majorana edge modes and numerical results on the localization of single-particle excitations are presented. The implication of a region with fully localized domain-wall-like excitations in the

    更新日期:2020-12-13
  • Ponderomotively assisted ionization injection in plasma wakefield accelerators
    New J. Phys. (IF 3.539) Pub Date : 2020-12-10
    Ming Zeng, Alberto Martinez de la Ossa and Jens Osterhoff

    An injection scheme is proposed to realize electron trapping in sub-relativistic plasma wakefield accelerators. A laser under oblique angle of incidence ionizes a dopant gas in plasma and ponderomotively accelerates the released electrons into the direction of wake propagation. This process enables electron trapping in the wakefield even for a wakefield potential below the trapping threshold. We study

    更新日期:2020-12-13
  • New spin-resolved thermal radiation laws for nonreciprocal bianisotropic media
    New J. Phys. (IF 3.539) Pub Date : 2020-12-08
    Chinmay Khandekar, Farhad Khosravi, Zhou Li and Zubin Jacob

    A chiral absorber of light can emit spin-polarized (circularly polarized) thermal radiation based on Kirchhoff’s law which equates spin-resolved emissivity with spin-resolved absorptivity for reciprocal media at thermal equilibrium. No such law is known for nonreciprocal media. In this work, we discover three spin-resolved Kirchhoff’s laws of thermal radiation applicable for both reciprocal and nonreciprocal

    更新日期:2020-12-09
  • Promoting rebound of impinging viscoelastic droplets on heated superhydrophobic surfaces
    New J. Phys. (IF 3.539) Pub Date : 2020-12-08
    Bin Li, Shiji Lin, Yile Wang, Quanzi Yuan, Sang W Joo and Longquan Chen

    The rebound of impinging droplets is a defining characteristic of superhydrophobic surfaces; yet, such an intriguing interfacial phenomenon can be effectively suppressed by adding a tiny amount of flexible polymers to induce non-Newtonian viscoelastic properties. In this work, however, we demonstrate the promoting effects of surface heating on the rebound of impinging viscoelastic droplets on superhydrophobic

    更新日期:2020-12-09
  • Coupling between guided modes of two parallel nanofibers
    New J. Phys. (IF 3.539) Pub Date : 2020-12-08
    Fam Le Kien, Lewis Ruks, Síle Nic Chormaic and Thomas Busch

    We study the coupling between the fundamental guided modes of two identical parallel nanofibers analytically and numerically. We calculate the coefficients of directional coupling, butt coupling, and self coupling as functions of the fiber radius, the light wavelength, and the fiber separation distance. We show that, due to the symmetry of the system, a mode of a nanofiber with the principal quasilinear

    更新日期:2020-12-09
  • Dynamical phase diagram of ultracold Josephson junctions
    New J. Phys. (IF 3.539) Pub Date : 2020-12-08
    K Xhani, L Galantucci, C F Barenghi, G Roati, A Trombettoni and N P Proukakis

    We provide a complete study of the phase diagram characterising the distinct dynamical regimes emerging in a three-dimensional Josephson junction in an ultracold quantum gas. Considering trapped ultracold superfluids separated into two reservoirs by a barrier of variable height and width, we analyse the population imbalance dynamics following a variable initial population mismatch. We demonstrate that

    更新日期:2020-12-09
  • Two distinctive regimes in the charge transport of a magnetic topological ultra thin film
    New J. Phys. (IF 3.539) Pub Date : 2020-12-08
    Amir Sabzalipour, Moslem Mir, Mohammad Zarenia and Bart Partoens

    The effect of the magnetic impurities on the charge transport in a magnetic topological ultra-thin film (MTF) is analytically investigated by applying the semi-classical Boltzmann framework through a modified relaxation-time approximation. Our results for the relaxation time of electrons as well as the charge conductivity of the system exhibit two distinct regimes of transport. We show that the generated

    更新日期:2020-12-09
  • Quantum dynamics of vibrational energy flow in oscillator chains driven by anharmonic interactions
    New J. Phys. (IF 3.539) Pub Date : 2020-12-08
    Raffaele Borrelli and Maxim F Gelin

    A new model of vibrational energy transfer in molecular systems taking into account anharmonic (third order) interactions of localized vibrations with a chain of harmonic oscillators is developed. The role of the energy spectrum of the chain and of the magnitude of the non-linear coupling is discussed in detail by an exact numerical solution of the quantum dynamical problem based on the tensor-train

    更新日期:2020-12-09
  • Fluorescence properties of self assembled colloidal supraparticles from CdSe/CdS/ZnS nanocrystals
    New J. Phys. (IF 3.539) Pub Date : 2020-12-01
    Victor Blondot, Alexandra Bogicevic, Antoine Coste, Christophe Arnold, Stéphanie Buil, Xavier Quélin, Thomas Pons, Nicolas Lequeux and Jean-Pierre Hermier

    We first report the synthesis of supraparticles with a mean diameter of 130 nm consisting in a compact self-assembly of colloidal CdSe/CdS/ZnS nanocrystals encapsulated in a silica shell. This provides a system with robust optical properties such as a high quantum efficiency, a stable and Poissonian emission at room temperature. Additionally, enhancement of the photoluminescence decay rate through

    更新日期:2020-12-02
  • Geometric spin–orbit coupling and chirality-induced spin selectivity
    New J. Phys. (IF 3.539) Pub Date : 2020-11-24
    Atsuo Shitade and Emi Minamitani

    We report a new type of spin–orbit coupling (SOC) called geometric SOC. Starting from the relativistic theory in curved space, we derive an effective nonrelativistic Hamiltonian in a generic curve embedded into flat three dimensions. The geometric SOC is O ( m −1 ), in which m is the electron mass, and hence much larger than the conventional SOC of O ( m −2 ). The energy scale is estimated to be a

    更新日期:2020-12-01
  • Effective Langevin equations for a polar tracer in an active bath
    New J. Phys. (IF 3.539) Pub Date : 2020-11-24
    Miloš Knežević and Holger Stark

    We study the motion of a polar tracer, having a concave surface, immersed in a two-dimensional suspension of active particles. Using Brownian dynamics simulations, we measure the distributions and auto-correlation functions of force and torque exerted by active particles on the tracer. The tracer experiences a finite average force along its polar axis, while all the correlation functions show exponential

    更新日期:2020-12-01
  • Mean first-passage time to a small absorbing target in an elongated planar domain
    New J. Phys. (IF 3.539) Pub Date : 2020-11-24
    Denis S. Grebenkov and Alexei T. Skvortsov

    We derive an approximate but fully explicit formula for the mean first-passage time (MFPT) to a small absorbing target of arbitrary shape in a general elongated domain in the plane. Our approximation combines conformal mapping, boundary homogenisation, and Fick–Jacobs equation to express the MFPT in terms of diffusivity and geometric parameters. A systematic comparison with a numerical solution of

    更新日期:2020-12-01
  • Spin-valley locked topological edge states in a staggered chiral photonic crystal
    New J. Phys. (IF 3.539) Pub Date : 2020-11-20
    Minkyung Kim, Yeseul Kim and Junsuk Rho

    Engineering pseudo-spin and valley degrees of freedom using quantum spin Hall and valley Hall effects has opened up remarkable possibilities for highly efficient and robust signal transport in time-reversal invariant photonic systems. Here we present a spin-valley locked photonic crystal that has distinct signs of chirality of sublattices in a honeycomb unit cell. We show that the photonic crystal

    更新日期:2020-11-23
  • Nonequilibrium thermodynamics of turbulence and stochastic fluid systems
    New J. Phys. (IF 3.539) Pub Date : 2020-11-19
    Wei Wu and Jin Wang

    Fluid systems are found in the Universe at various scales. Turbulence as a complex form of fluid motion far from thermodynamic equilibrium remains one of the most challenging problems in physics. In this work, we study the nonequilibrium thermodynamics of stochastic fluid systems in general and turbulence in particular. Our approach is based on a reinterpretation of the stochastic fluid system as an

    更新日期:2020-11-23
  • Continuous narrowband lasing with coherently driven V-level atoms
    New J. Phys. (IF 3.539) Pub Date : 2020-11-19
    Christoph Hotter, David Plankensteiner and Helmut Ritsch

    Simultaneous strong coherent pumping of the two transitions of a V-level atom with very different decay rates has been predicted to create almost perfect inversion on the narrower transition. Using the example of the blue and red transitions in Strontium we show that for suitable operating conditions the corresponding resonant gain can be used to continuously operate a laser on the narrow transition

    更新日期:2020-11-23
  • Selective tuning of Hilbert spaces in states encoded with spatial modes of light
    New J. Phys. (IF 3.539) Pub Date : 2020-11-19
    Ali Anwar, Nijil Lal, Shashi Prabhakar and R P Singh

    Spatial modes of light directly give the most easily accessible degree of freedom that span an infinite dimensional Hilbert space. The higher dimensional spatial mode entanglement realized using spontaneous parametric down conversion (SPDC) process is generally restricted to the subspace defined by a single spatial mode in pump. Access to other modal subspaces can be realized by pumping beams carrying

    更新日期:2020-11-23
  • Electronic Maxwell’s equations
    New J. Phys. (IF 3.539) Pub Date : 2020-11-19
    Mingjie Li, Peng Shi, Luping Du and Xiaocong Yuan

    To date, the wave nature of electron has been widely researched, together with its similarity to optics. To unify electronic waves and electromagnetic waves, we establish four equations analogous to Maxwell’s equations by expressing the Dirac equation in terms of the quaternions. We develop some fundamental theories from the electronic version of Maxwell’s equations. In practice, solving electron wave

    更新日期:2020-11-23
  • Finite-range viscoelastic subdiffusion in disordered systems with inclusion of inertial effects
    New J. Phys. (IF 3.539) Pub Date : 2020-11-19
    Igor Goychuk and Thorsten Pöschel

    This work justifies further paradigmatic importance of the model of viscoelastic subdiffusion in random environments for the observed subdiffusion in cellular biological systems. Recently, we showed (2018, PCCP , 20 , 24140) that this model displays several remarkable features, which makes it an attractive paradigm to explain the physical nature of subdiffusion occurring in biological cells. In particular

    更新日期:2020-11-23
  • Phase detection with neural networks: interpreting the black box
    New J. Phys. (IF 3.539) Pub Date : 2020-11-16
    Anna Dawid, Patrick Huembeli, Michal Tomza, Maciej Lewenstein and Alexandre Dauphin

    Neural networks (NNs) usually hinder any insight into the reasoning behind their predictions. We demonstrate how influence functions can unravel the black box of NN when trained to predict the phases of the one-dimensional extended spinless Fermi–Hubbard model at half-filling. Results provide strong evidence that the NN correctly learns an order parameter describing the quantum transition in this model

    更新日期:2020-11-17
  • Gibbs mixing of partially distinguishable photons with a polarising beamsplitter membrane
    New J. Phys. (IF 3.539) Pub Date : 2020-11-16
    Zoë Holmes, Florian Mintert and Janet Anders

    For a thought experiment concerning the mixing of two classical gases, Gibbs concluded that the work that can be extracted from mixing is determined by whether or not the gases can be distinguished by a semi-permeable membrane; that is, the mixing work is a discontinuous function of how similar the gases are. Here we describe an optomechanical setup that generalises Gibbs’ thought experiment to partially

    更新日期:2020-11-17
  • Mesoscopic quantum superposition states of weakly-coupled matter-wave solitons
    New J. Phys. (IF 3.539) Pub Date : 2020-11-16
    Dmitriy Tsarev, Alexander Alodjants, The Vinh Ngo and Ray-Kuang Lee

    The Josephson junctions (JJs) are at the heart of modern quantum technologies and metrology. In this work we establish quantum features of an atomic soliton Josephson junction (SJJ) device, which consists of two weakly-coupled condensates with negative scattering length. The condensates are trapped in a double-well potential and elongated in one dimension. Starting with classical field theory we map

    更新日期:2020-11-17
  • Quantum proportional-integral (PI) control
    New J. Phys. (IF 3.539) Pub Date : 2020-11-16
    Hui Chen, Hanhan Li, Felix Motzoi, Leigh Martin, K Birgitta Whaley and Mohan Sarovar

    Feedback control is an essential component of many modern technologies and provides a key capability for emergent quantum technologies. We extend existing approaches of direct feedback control in which the controller applies a function directly proportional to the output signal (P feedback), to strategies in which feedback determined by an integrated output signal (I feedback), and to strategies in

    更新日期:2020-11-17
  • Disorder-immune metasurfaces with constituents exhibiting the anapole mode
    New J. Phys. (IF 3.539) Pub Date : 2020-11-13
    Hao Song, Neng Wang, Kuai Yu, Jihong Pei and Guo Ping Wang

    Common optical metasurfaces are two-dimensional functional devices composed of periodically arranged subwavelength constituents. Here, we achieved the positional-disorder-immune metasurfaces composed of core–shell cylinders which successively exhibit the magnetic dipole (MD) resonant, non-radiating anapole, and electric dipole (ED) resonant modes when their outer radii are fixed and the inner radii

    更新日期:2020-11-13
  • Minimal entropy production rate of interacting systems
    New J. Phys. (IF 3.539) Pub Date : 2020-11-13
    David H Wolpert

    Many systems are composed of multiple, interacting subsystems, where the dynamics of each subsystem only depends on the states of a subset of the other subsystems, rather than on all of them. I analyze how such constraints on the dependencies of each subsystem’s dynamics affects the thermodynamics of the overall, composite system. Specifically, I derive a strictly nonzero lower bound on the minimal

    更新日期:2020-11-13
  • Microscopic origin of molecule excitation via inelastic electron scattering in scanning tunneling microscope
    New J. Phys. (IF 3.539) Pub Date : 2020-11-12
    Guohui Dong, Yining You and Hui Dong

    The scanning-tunneling-microscope-induced luminescence emerges recently as an incisive tool to measure the molecular properties down to the single-molecule level. The rapid experimental progress is far ahead of the theoretical effort to the observed phenomena. Such incompetence leads to a significant difficulty in quantitatively assigning the observed feature of the fluorescence spectrum to the structure

    更新日期:2020-11-13
  • Strong surface magnetic field generation in relativistic short pulse laser–plasma interaction with an applied seed magnetic field
    New J. Phys. (IF 3.539) Pub Date : 2020-11-12
    K Weichman, A P L Robinson, M Murakami and A V Arefiev

    While plasma often behaves diamagnetically, we demonstrate that the laser irradiation of a thin opaque target with an embedded target-transverse seed magnetic field B seed can trigger the generation of an order-of-magnitude stronger magnetic field with opposite sign at the target surface. Strong surface field generation occurs when the laser pulse is relativistically intense and results from the currents

    更新日期:2020-11-13
  • X-ray standing wave studies of molecular adsorption: why coherent fractions matter
    New J. Phys. (IF 3.539) Pub Date : 2020-11-12
    D P Woodruff and D A Duncan

    The normal incidence x-ray standing wave (NIXSW) technique is the primary source of quantitative experimental information on the adsorption height of many near-planar molecules on metal surfaces, of relevance to organic electronics. The technique yields two structural parameters, the coherent position and the coherent fraction. For high values of the coherent fraction the coherent position can be related

    更新日期:2020-11-13
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