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  • Routes to control Cooper minimum in high order harmonics generated in argon gas
    New J. Phys. (IF 3.539) Pub Date : 2020-08-10
    G S Boltaev, R A Ganeev, N A Abbasi, M Iqbal, V V Kim, H Al-Harmi, X M Tong and A S Alnaser

    We present a systematic study on the control of Cooper minimum (CM) in the high-order harmonics spectra generated during the interaction of Ar gas with ultrashort near-infrared laser pulses. Tailoring the width and depth of CM in argon is demonstrated by changing the gas jet position with respect to the focal plane of focusing lens and by defocusing-assisted phase-matching. We further analyze the influence

    更新日期:2020-08-11
  • Nanoscale ion implantation using focussed highly charged ions
    New J. Phys. (IF 3.539) Pub Date : 2020-08-10
    Paul Räcke, Ralf Wunderlich, Jürgen W Gerlach, Jan Meijer and Daniel Spemann

    We introduce a focussed ion beam (FIB) based ion implanter equipped with an electron beam ion source (EBIS), able to produce highly charged ions. As an example of its utilisation, we demonstrate the direct writing of nitrogen-vacancy centres in diamond using focussed, mask-less irradiation with Ar 8+ ions with sub-micron three dimensional placement accuracy. The ion optical system was optimised and

    更新日期:2020-08-11
  • Magnetic field induced symmetry breaking in nonequilibrium quantum networks
    New J. Phys. (IF 3.539) Pub Date : 2020-08-10
    Juzar Thingna, Daniel Manzano and Jianshu Cao

    We study the effect of an applied magnetic field on the nonequilibrium transport properties of a general cubic quantum network described by a tight-binding Hamiltonian with specially designed couplings to the leads that preserve open-system symmetries. We demonstrate that the symmetry of open systems can be manipulated by the direction of the magnetic field. Starting with all the symmetries preserved

    更新日期:2020-08-11
  • Discovery of an unconventional charge modulation on the surface of charge-density-wave material TaTe 4
    New J. Phys. (IF 3.539) Pub Date : 2020-08-10
    Haigen Sun, Zhibin Shao, Tianchuang Luo, Qiangqiang Gu, Zongyuan Zhang, Shaojian Li, Lijun Liu, Habakubaho Gedeon, Xin Zhang, Qi Bian, Ji Feng, Jian Wang and Minghu Pan

    Electronic systems with quasi-one-dimensional (Q1D) Fermi surface tend to form either a charge-density-wave (CDW) or a spin-density-wave ground state at low temperatures due to one-dimensional instabilities. Among various CDW states, surface CDWs are different from that within the bulk due to the reduced dimensionality. Here we report the systematic investigation of charge density modulation on the

    更新日期:2020-08-11
  • The frustration of being odd: how boundary conditions can destroy local order
    New J. Phys. (IF 3.539) Pub Date : 2020-08-10
    Vanja Marić, Salvatore Marco Giampaolo, Domagoj Kuić and Fabio Franchini

    A central tenant in the classification of phases is that boundary conditions cannot affect the bulk properties of a system. In this work, we show striking, yet puzzling, evidence of a clear violation of this assumption. We use the prototypical example of an XYZ chain with no external field in a ring geometry with an odd number of sites and both ferromagnetic and antiferromagnetic interactions. In such

    更新日期:2020-08-11
  • Quantum probing beyond pure dephasing
    New J. Phys. (IF 3.539) Pub Date : 2020-08-10
    Dario Tamascelli, Claudia Benedetti, Heinz-Peter Breuer and Matteo G A Paris

    Quantum probing is the art of exploiting simple quantum systems interacting with a complex environment to extract precise information about some environmental parameters, e.g. the temperature of the environment or its spectral density. Here we analyze the performance of a single-qubit probe in characterizing Ohmic bosonic environments at thermal equilibrium. In particular, we analyze the effects of

    更新日期:2020-08-11
  • The interplay between local and non-local master equations: exact and approximated dynamics
    New J. Phys. (IF 3.539) Pub Date : 2020-08-09
    Nina Megier, Andrea Smirne and Bassano Vacchini

    Master equations are a useful tool to describe the evolution of open quantum systems. In order to characterize the mathematical features and the physical origin of the dynamics, it is often useful to consider different kinds of master equations for the same system. Here, we derive an exact connection between the time-local and the integro-differential descriptions, focusing on the class of commutative

    更新日期:2020-08-11
  • Lightning network: a second path towards centralisation of the Bitcoin economy
    New J. Phys. (IF 3.539) Pub Date : 2020-08-09
    Jian-Hong Lin, Kevin Primicerio, Tiziano Squartini, Christian Decker and Claudio J Tessone

    The Bitcoin lightning network (BLN), a so-called ‘second layer’ payment protocol, was launched in 2018 to scale up the number of transactions between Bitcoin owners. In this paper, we analyse the structure of the BLN over a period of 18 months, ranging from 12th January 2018 to 17th July 2019, at the end of which the network has reached 8.216 users, 122.517 active channels and 2.732,5 transacted Bitcoins

    更新日期:2020-08-10
  • Mesoscopic interference for metric and curvature & gravitational wave detection
    New J. Phys. (IF 3.539) Pub Date : 2020-08-09
    Ryan J Marshman, Anupam Mazumdar, Gavin W Morley, Peter F Barker, Steven Hoekstra and Sougato Bose

    A compact detector for space-time metric and curvature is highly desirable. Here we show that quantum spatial superpositions of mesoscopic objects could be exploited to create such a detector. We propose a specific form for such a detector and analyse how asymmetries in its design allow it to directly couple to the curvature. Moreover, we also find that its non-symmetric construction and the large

    更新日期:2020-08-10
  • The dynamics of cooperation in asymmetric sub-populations
    New J. Phys. (IF 3.539) Pub Date : 2020-08-09
    H Guo, X Li, K Hu, X Dai, D Jia, S Boccaletti, M Perc and Z Wang

    Sacrificing personal benefits for a common good is at odds with the fundamental principle of Darwinian evolution: if only the fittest survives, then there should be no place for cooperation. But cooperative behavior actually abounds, and constitutes one of the most persistent and fascinating puzzles of nature. One solution to this puzzle is network reciprocity, where the collective dynamics of cooperators

    更新日期:2020-08-10
  • Far-field and near-field directionality in acoustic scattering
    New J. Phys. (IF 3.539) Pub Date : 2020-08-09
    Lei Wei and Francisco J Rodríguez-Fortuño

    Far-field directional scattering and near-field directional coupling from simple sources have recently received great attention in photonics: beyond circularly-polarized dipoles, whose directional coupling to evanescent waves was recently applied to acoustics, the near-field directionality of modes in optics includes phased combinations of electric and magnetic dipoles, such as the Janus dipole and

    更新日期:2020-08-10
  • Intercore spontaneous Raman scattering impact on quantum key distribution in multicore fiber
    New J. Phys. (IF 3.539) Pub Date : 2020-08-09
    Chun Cai, Yongmei Sun and Yuefeng Ji

    We propose a theoretical model to quantitatively estimate the intercore spontaneous Raman scattering (ICSRS) in multicore fiber based on intercore crosstalk. We analyze the properties of ICSRS through numerical simulations. Then, the impact of ICSRS on quantum key distribution (QKD) is evaluated with a classical dense wavelength division multiplexing system in a seven-core fiber. We evaluate the impact

    更新日期:2020-08-10
  • From a continuous to a discrete time crystal in a dissipative atom-cavity system
    New J. Phys. (IF 3.539) Pub Date : 2020-08-09
    Hans Keßler, Jayson G Cosme, Christoph Georges, Ludwig Mathey and Andreas Hemmerich

    We propose the dynamical stabilization of a nonequilibrium order in a driven dissipative system comprised an atomic Bose–Einstein condensate inside a high finesse optical cavity, pumped with an optical standing wave operating in the regime of anomalous dispersion. When the amplitude of the pump field is modulated close to twice the characteristic limit-cycle frequency of the unmodulated system, a stable

    更新日期:2020-08-10
  • Waves induced by heterogeneity in oscillatory media
    New J. Phys. (IF 3.539) Pub Date : 2020-08-09
    Chunli Huang, Xiaoqing Huang, Xiaoming Zhang and Xiaohua Cui

    Various behaviours of nonlinear wave propagation and competition have been discussed and investigated extensively and meticulously, especially when the media are homogeneous. However, corresponding studies in heterogeneous media are much scarcer. In this paper, spontaneously generated waves from one-dimensional heterogeneous oscillatory media, modelled by complex Ginzburg–Landau equations with spatially

    更新日期:2020-08-10
  • Species-dependent tunneling ionization of weakly bound atoms in the short-wave infrared regime
    New J. Phys. (IF 3.539) Pub Date : 2020-08-09
    D Zille, D Adolph, S Skruszewicz, A M Sayler and G G Paulus

    We investigate the intensity- and species-dependent strong-field ionization of alkali metal atoms; sodium, potassium, rubidium and caesium; by intense, few-cycle laser pulses in the short-wave infrared (sw-IR) regime at 1800 nm. The low ionization potential, I p , of these atoms allows us to scale the interaction and study the tunneling regime at sw-IR wavelengths using low intensities and pulse energies

    更新日期:2020-08-10
  • Deconstructing effective non-Hermitian dynamics in quadratic bosonic Hamiltonians
    New J. Phys. (IF 3.539) Pub Date : 2020-08-06
    Vincent P Flynn, Emilio Cobanera and Lorenza Viola

    Unlike their fermionic counterparts, the dynamics of Hermitian quadratic bosonic Hamiltonians are governed by a generally non-Hermitian Bogoliubov-de Gennes effective Hamiltonian. This underlying non-Hermiticity gives rise to a dynamically stable regime, whereby all observables undergo bounded evolution in time, and a dynamically unstable one, whereby evolution is unbounded for at least some observables

    更新日期:2020-08-10
  • Entropic time–energy uncertainty relations: an algebraic approach
    New J. Phys. (IF 3.539) Pub Date : 2020-08-06
    Christian Bertoni, Yuxiang Yang and Joseph M Renes

    We address entropic uncertainty relations between time and energy or, more precisely, between measurements of an observable G and the displacement r of the G -generated evolution e −i rG . We derive lower bounds on the entropic uncertainty in two frequently considered scenarios, which can be illustrated as two different guessing games in which the role of the guessers are fixed or not. In particular

    更新日期:2020-08-10
  • Flagellar length control in biflagellate eukaryotes: time-of-flight, shared pool, train traffic and cooperative phenomena
    New J. Phys. (IF 3.539) Pub Date : 2020-08-05
    Swayamshree Patra, Frank Jülicher and Debashish Chowdhury

    Flagella of eukaryotic cells are transient long cylindrical protrusions. The proteins needed to form and maintain flagella are synthesized in the cell body and transported to the distal tips. What ‘rulers’ or ‘timers’ a specific type of cells use to strike a balance between the outward and inward transport of materials so as to maintain a particular length of its flagella in the steady state is one

    更新日期:2020-08-06
  • Intermittent percolation and the scale-free distribution of vegetation clusters
    New J. Phys. (IF 3.539) Pub Date : 2020-08-05
    Paula Villa Martín, Virginia Domínguez-García and Miguel A Muñoz

    Understanding the causes and effects of spatial vegetation patterns is a fundamental problem in ecology, especially because these can be used as early predictors of catastrophic shifts such as desertification processes. Empirical studies of the vegetation cover in some areas such as drylands and semiarid regions have revealed the existence of vegetation patches of broadly diverse sizes. In particular

    更新日期:2020-08-06
  • Non-Markovian effects on charging and self-discharging process of quantum batteries
    New J. Phys. (IF 3.539) Pub Date : 2020-08-05
    F H Kamin, F T Tabesh, S Salimi, F Kheirandish and Alan C Santos

    The performance of quantum technologies that use entanglement and coherence as a resource is highly limited by the effects of decoherence due to their interaction with some environment. In particular, it is important to take into account situations where such devices unavoidably interact with surrounding. Here, we study memory effects on energy and ergotropy of quantum batteries in the framework of

    更新日期:2020-08-06
  • Pair correlations in the normal phase of an attractive Fermi gas
    New J. Phys. (IF 3.539) Pub Date : 2020-08-05
    M Pini, P Pieri, M Jäger, J Hecker Denschlag and G Calvanese Strinati

    In a recent paper (2019 Phys. Rev. A 99 , 053617), the total number of fermion pairs in a spin-balanced two-component Fermi gas of 6 Li atoms was experimentally probed in the normal phase above the superfluid critical temperature, in order to investigate the sectors of pseudogap and preformed-pair in the temperature–coupling phase diagram. Here, we present a theoretical account of these experimental

    更新日期:2020-08-06
  • Simultaneous switching at multiple frequencies and triple plasmon-induced transparency in multilayer patterned graphene-based terahertz metamaterial
    New J. Phys. (IF 3.539) Pub Date : 2020-08-04
    Zhimin Liu, Xiao Zhang, Zhenbin Zhang, Enduo Gao, Fengqi Zhou, Hongjian Li and Xin Luo

    A novel multilayer terahertz metamaterial composed of double rectangle, vertical single rectangle, vertical double rectangle and single rectangle graphene layer is proposed. The dynamic adjustable triple plasmon induced transparency (PIT) is realized by coupling two bright modes and two dark modes, which is an especial synergy effect between two single-PIT. Coupled mode theory contained four resonators

    更新日期:2020-08-05
  • Doping a lattice-trapped bosonic species with impurities: from ground state properties to correlated tunneling dynamics
    New J. Phys. (IF 3.539) Pub Date : 2020-08-04
    Kevin Keiler, Simeon I Mistakidis and Peter Schmelcher

    We investigate the ground state properties and the nonequilibrium dynamics of a lattice trapped bosonic mixture consisting of an impurity species and a finite-sized medium. For the case of one as well as two impurities we observe that, depending on the lattice depth and the interspecies interaction strength, a transition from a strongly delocalized to a localized impurity distribution occurs. In the

    更新日期:2020-08-05
  • Instability and fingering of interfaces in growing tissue
    New J. Phys. (IF 3.539) Pub Date : 2020-08-03
    Tobias Büscher, Angel L Diez, Gerhard Gompper and Jens Elgeti

    Interfaces in tissues are ubiquitous, both between tissue and environment as well as between populations of different cell types. The propagation of an interface can be driven mechanically. Computer simulations of growing tissues are employed to study the stability of the interface between two tissues on a substrate. From a mechanical perspective, the dynamics and stability of this system is controlled

    更新日期:2020-08-04
  • Spatial structure of lasing modes in wave-chaotic semiconductor microcavities
    New J. Phys. (IF 3.539) Pub Date : 2020-08-03
    Stefan Bittner, Kyungduk Kim, Yongquan Zeng, Qi Jie Wang and Hui Cao

    We present experimental and numerical studies of broad-area semiconductor lasers with chaotic ray dynamics. The emission intensity distributions at the cavity boundaries are measured and compared to ray tracing simulations and numerical calculations of the passive cavity modes. We study two different cavity geometries, a D-cavity and a stadium, both of which feature fully chaotic ray dynamics. While

    更新日期:2020-08-04
  • Weyl points and topological surface states in a three-dimensional sandwich-type elastic lattice
    New J. Phys. (IF 3.539) Pub Date : 2020-08-03
    Sai Sanjit Ganti, Ting-Wei Liu and Fabio Semperlotti

    Following the realization of Weyl semimetals in quantum electronic materials, classical wave analogues of Weyl materials have also been theorized and experimentally demonstrated in photonics and acoustics. Weyl points in elastic systems, however, have been a much more recent discovery. In this study, we report on the design of an elastic fully-continuum three-dimensional material that, while offering

    更新日期:2020-08-04
  • Coherence in logical quantum channels
    New J. Phys. (IF 3.539) Pub Date : 2020-08-02
    Joseph K Iverson and John Preskill

    We study the effectiveness of quantum error correction against coherent noise. Coherent errors (for example, unitary noise) can interfere constructively, so that in some cases the average infidelity of a quantum circuit subjected to coherent errors may increase quadratically with the circuit size; in contrast, when errors are incoherent (for example, depolarizing noise), the average infidelity increases

    更新日期:2020-08-03
  • The ultimate state of convection: a unifying picture of very high Rayleigh numbers experiments
    New J. Phys. (IF 3.539) Pub Date : 2020-08-02
    Philippe-E Roche

    The long-standing puzzle of diverging heat transport measurements at very high Rayleigh numbers (Ra) is addressed by a simple model based on well-known properties of classical boundary layers. The transition to the ‘ultimate state’ of convection in Rayleigh–Bénard cells is modeled as sub-critical transition controlled by the instability of large-scale boundary-layer eddies. These eddies are restricted

    更新日期:2020-08-03
  • Robust dynamical exchange cooling with trapped ions
    New J. Phys. (IF 3.539) Pub Date : 2020-08-02
    T Sägesser, R Matt, R Oswald and J P Home

    We investigate theoretically the possibility for robust and fast cooling of a trapped atomic ion by transient interaction with a pre-cooled ion. The transient coupling is achieved through dynamical control of the ions’ equilibrium positions. To achieve short cooling times we make use of shortcuts to adiabaticity by applying invariant-based engineering. We design these to take account of imperfections

    更新日期:2020-08-03
  • Condensed matter physics in time crystals
    New J. Phys. (IF 3.539) Pub Date : 2020-08-02
    Lingzhen Guo and Pengfei Liang

    Time crystals are physical systems whose time translation symmetry is spontaneously broken. Although the spontaneous breaking of continuous time-translation symmetry in static systems is proved impossible for the equilibrium state, the discrete time-translation symmetry in periodically driven (Floquet) systems is allowed to be spontaneously broken, resulting in the so-called Floquet or discrete time

    更新日期:2020-08-03
  • Coherent, high repetition rate tender x-ray free-electron laser seeded by an extreme ultra-violet free-electron laser oscillator
    New J. Phys. (IF 3.539) Pub Date : 2020-08-02
    V Petrillo, M Opromolla, A Bacci, F Broggi, I Drebot, G Ghiringhelli, E Puppin, M Rossetti Conti, A R Rossi, M Ruijter, S Samsam, A Tagliaferri, G Rossi and L Serafini

    A seeded FEL driven by a linac based on super conducting cavities, generating 10 8 –10 10 coherent photons per shot at 2–5 keV with 0.2–1 MHz of repetition rate, can address the need of a source devoted to fine analysis of matter using the linear spectroscopy technique. The seeding scheme described hereafter is a multi-stage cascade upshifting the radiation frequency by a factor 20–40. The x-ray range

    更新日期:2020-08-03
  • Does cosmological evolution select for technology?
    New J. Phys. (IF 3.539) Pub Date : 2020-08-02
    Jeffrey M Shainline

    If the parameters defining the physics of our universe departed from their present values, the observed rich structure and complexity would not be supported. This article considers whether similar fine-tuning of parameters applies to technology. The anthropic principle is one means of explaining the observed values of the parameters. This principle constrains physical theories to allow for our existence

    更新日期:2020-08-03
  • Magnetic field generation in a laser-irradiated thin collisionless plasma target by return current electrons carrying orbital angular momentum
    New J. Phys. (IF 3.539) Pub Date : 2020-08-02
    Y Shi, K Weichman, R J Kingham and A V Arefiev

    Magnetized high energy density physics offers new opportunities for observing magnetic field-related physics for the first time in the laser–plasma context. We focus on one such phenomenon, which is the ability of a laser-irradiated magnetized plasma to amplify a seed magnetic field. We performed a series of fully kinetic 3D simulations of magnetic field amplification by a picosecond-scale relativistic

    更新日期:2020-08-03
  • From micro- to macrorealism: addressing experimental clumsiness with semi-weak measurements
    New J. Phys. (IF 3.539) Pub Date : 2020-07-30
    Devashish Pandey, Xavier Oriols and Guillermo Albareda

    We propose a protocol that allows to assess the precise correspondence between thought and practical experiments, a critical point for addressing experimental clumsiness in a test of macro- or micro-realism. Two-time generalized von Neumann measurements of properties ##IMG## [http://ej.iop.org/images/1367-2630/22/7/073047/njpab9ae1ieqn1.gif] {$\mathcal{A}$} and ##IMG## [http://ej.iop.org/images/13

    更新日期:2020-07-31
  • Weyl fermions in ferromagnetic high-temperature phase of K 2 Cr 8 O 16
    New J. Phys. (IF 3.539) Pub Date : 2020-07-30
    J Z Zhao, Y J Jin, R Wang, B W Xia and H Xu

    By combining first-principles calculations and symmetry arguments, we propose that the half-metallic phase of K 2 Cr 8 O 16 presents ferromagnetic Weyl fermions. In particular, K 2 Cr 8 O 16 possesses two pairs of Weyl nodes, which originate from two groups of nodal lines connected by the mirror reflection symmetry. We show that the non-trivial topological properties of K 2 Cr 8 O 16 come from the

    更新日期:2020-07-31
  • Quasi-fine-grained uncertainty relations
    New J. Phys. (IF 3.539) Pub Date : 2020-07-30
    Yunlong Xiao, Yu Xiang, Qiongyi He and Barry C Sanders

    Nonlocality, which is the key feature of quantum theory, has been linked with the uncertainty principle by fine-grained uncertainty relations, by considering combinations of outcomes for different measurements. However, this approach assumes that information about the system to be fine-grained is local, and does not present an explicitly computable bound. Here, we generalize above approach to general

    更新日期:2020-07-31
  • Optimality and universality in quantum Zeno dynamics
    New J. Phys. (IF 3.539) Pub Date : 2020-07-30
    Sergey Belan and Vladimir Parfenyev

    The effective lifetime of a quantum state can increase (the quantum Zeno effect) or decrease (the quantum anti-Zeno effect) in the response to increasing frequency of the repeated measurements and the multiple transitions between these two regimes are potentially possible within the same system. An interesting question arising in this regards is how to choose the optimal schedule of repeated measurements

    更新日期:2020-07-31
  • Lorentz-violating type-II Dirac fermions in full-Heusler compounds XMg 2 Ag (X = Pr, Nd, Sm)
    New J. Phys. (IF 3.539) Pub Date : 2020-07-30
    Weizhen Meng, Xiaoming Zhang, Ying Liu, Xuefang Dai and Guodong Liu

    Lorentz-violating type-II Dirac fermion, as a new type of quasiparticles beyond the high-energy physics, has received intense attention recently. However, excellent candidate materials which contain sufficiently more type-II Dirac points near the Fermi level are still in scarcity. Here, we report a family of existing full-Heusler compounds, namely XMg 2 Ag (X = Pr, Nd, Sm), can serve as excellent Lorentz-violating

    更新日期:2020-07-31
  • Effect of phonons on the electron spin resonance absorption spectrum
    New J. Phys. (IF 3.539) Pub Date : 2020-07-30
    Ariel Norambuena, Alejandro Jimenez, Christoph Becher and Jerónimo R Maze

    The unavoidable presence of vibrations in solid-state devices can drastically modify the expected electron spin resonance (ESR) absorption spectrum in magnetically active systems. In this work, we model the effect of phonons and temperature on the ESR signal in molecular systems with strong E ⊗ e Jahn–Teller (JT) effect and an electronic spin-1/2. Our microscopic model considers the linear JT interaction

    更新日期:2020-07-31
  • From classical xenon fringes to hydrogen interferometry
    New J. Phys. (IF 3.539) Pub Date : 2020-07-30
    Simon R Müller, Patrick Nedelec and Markus K Oberthaler

    A setup with three equally spaced transmission gratings can be described as a moiré deflectometer in the classical regime and as a Talbot–Lau interferometer in the quantum regime. We successfully operate such a three-grating device with a de Broglie wavelength span of more than two orders of magnitude (20 fm to 2.2 pm), employing different particles such as xenon, krypton, argon, helium, and hydrogen

    更新日期:2020-07-31
  • Precursor magneto-sonic solitons in a plasma from a moving charge bunch
    New J. Phys. (IF 3.539) Pub Date : 2020-07-29
    Atul Kumar and Abhijit Sen

    The nature of fore-wake excitations created by a charge bunch moving in a magnetized plasma is investigated using particle-in-cell simulations. Our studies establish for the first time the existence of precursor magneto-sonic solitons traveling ahead of a moving charge bunch. The nature of these excitations and the conditions governing their existence are delineated. We also confirm earlier molecular

    更新日期:2020-07-30
  • Precise high-fidelity electron–nuclear spin entangling gates in NV centers via hybrid dynamical decoupling sequences
    New J. Phys. (IF 3.539) Pub Date : 2020-07-29
    Wenzheng Dong, F A Calderon-Vargas and Sophia E Economou

    Color centers in solids, such as the nitrogen-vacancy center in diamond, offer well-protected and well-controlled localized electron spins that can be employed in various quantum technologies. Moreover, the long coherence time of the surrounding spinful nuclei can enable a robust quantum register controlled through the color center. We design pulse sequence protocols that drive the electron spin to

    更新日期:2020-07-30
  • A dissipative time crystal with or without Z 2 symmetry breaking
    New J. Phys. (IF 3.539) Pub Date : 2020-07-27
    Cristóbal Lledó and Marzena H Szymańska

    We study an emergent semiclassical time crystal composed of two interacting driven-dissipative bosonic modes. The system has a discrete ##IMG## [http://ej.iop.org/images/1367-2630/22/7/075002/njpab9ae3ieqn2.gif] {${\mathbb{Z}}_{2}$} spatial symmetry which, depending on the strength of the drive, can be broken in the time-crystalline phase or it cannot. An exact semiclassical mean-field analysis, numerical

    更新日期:2020-07-28
  • Reconstructing complex system dynamics from time series: a method comparison
    New J. Phys. (IF 3.539) Pub Date : 2020-07-27
    Forough Hassanibesheli, Niklas Boers and Jürgen Kurths

    Modeling complex systems with large numbers of degrees of freedom has become a grand challenge over the past decades. In many situations, only a few variables are actually observed in terms of measured time series, while the majority of variables—which potentially interact with the observed ones—remain hidden. A typical approach is then to focus on the comparably few observed, macroscopic variables

    更新日期:2020-07-28
  • Plasmonic biosensor based on excellently absorbable adjustable plasmon-induced transparency in black phosphorus and graphene metamaterials
    New J. Phys. (IF 3.539) Pub Date : 2020-07-27
    Chao Liu, Hongjian Li, Hui Xu, Mingzhuo Zhao, Cuixiu Xiong, Min Li, Banxian Ruan, Baihui Zhang and Kuan Wu

    Both black phosphorus (BP) and graphene metamaterials support surface plasmon resonance that is very sensitive to the local change of dielectric properties in the system. We design a novel BP ribbons and graphene sheet hybrid structures based on tunable mid-infrared plasmon-induced transparency. The destructive interference of two excited state modes in the structure leads to a pronounced induced transparent

    更新日期:2020-07-28
  • Covariance matrix entanglement criterion for an arbitrary set of operators
    New J. Phys. (IF 3.539) Pub Date : 2020-07-27
    Vinay Tripathi, Chandrashekar Radhakrishnan and Tim Byrnes

    A criterion for entanglement detection based on covariance matrices for an arbitrary set of observables is formulated. The method generalizes the covariance matrix entanglement criterion by Simon (2000 Phys. Rev. Lett. 84 2726) to a more general set of operators using the positive partial transpose test for the covariance matrix. The relation is found by starting from the generalized uncertainty relation

    更新日期:2020-07-28
  • Stochastic thermodynamics of relativistic Brownian motion
    New J. Phys. (IF 3.539) Pub Date : 2020-07-27
    P S Pal and Sebastian Deffner

    Physical scenarios that require a relativistic treatment are ubiquitous in nature, ranging from cosmological objects to charge carriers in Dirac materials. Interestingly all of these situations have in common that the systems typically operate very far from thermal equilibrium. Therefore, if and how the framework of stochastic thermodynamics applies at relativistic energies is a salient question. In

    更新日期:2020-07-28
  • Topological phases arising from attractive interaction and pair hopping in the extended Hubbard model
    New J. Phys. (IF 3.539) Pub Date : 2020-07-27
    Roman Rausch and Matthias Peschke

    The extended Hubbard model with an attractive density–density interaction, positive pair hopping, or both, is shown to host topological phases, with a doubly degenerate entanglement spectrum and interacting edge spins. This constitutes a novel instance of topological order which emerges from interactions. When the interaction terms combine in a charge-SU(2) symmetric fashion, a novel partially polarized

    更新日期:2020-07-28
  • Continuous time random walk in a velocity field: role of domain growth, Galilei-invariant advection-diffusion, and kinetics of particle mixing
    New J. Phys. (IF 3.539) Pub Date : 2020-07-27
    F Le Vot, E Abad, R Metzler and S B Yuste

    We consider the emerging dynamics of a separable continuous time random walk (CTRW) in the case when the random walker is biased by a velocity field in a uniformly growing domain. Concrete examples for such domains include growing biological cells or lipid vesicles, biofilms and tissues, but also macroscopic systems such as expanding aquifers during rainy periods, or the expanding Universe. The CTRW

    更新日期:2020-07-28
  • Dynamic signatures of mode competition in optically injected high- β lasers
    New J. Phys. (IF 3.539) Pub Date : 2020-07-27
    Benjamin Lingnau, David Schicke, Marcel Eichelmann and Kathy Lüdge

    In this paper we theoretically investigate the statistical light-emission properties of an optically injected bimodal quantum-dot micropillar laser with high spontaneous emission rates. The nanostructured device is described in terms of a stochastic, semiclassically derived rate equation model. We focus on the stochastic switching dynamics between the two fundamental modes and correlate the results

    更新日期:2020-07-28
  • Defect generation and dynamics during quenching in finite size homogeneous ion chains
    New J. Phys. (IF 3.539) Pub Date : 2020-07-26
    J Pedregosa-Gutierrez and M Mukherjee

    An equally spaced linear chain of ions provides a test-bed for studying the defect formation during a topological phase transition from a linear to a zig-zag configuration. By using a particular axial potential leading to an homogeneous ion chain, the boundary conditions are not needed, allowing new rich defect dynamics to appear on an homogeneous system. A semi-empirical expression for the critical

    更新日期:2020-07-27
  • Temporal correlations of sunlight may assist photoprotection in bacterial photosynthesis
    New J. Phys. (IF 3.539) Pub Date : 2020-07-26
    Adriana M De Mendoza, Felipe Caycedo-Soler, Susana F Huelga and Martin B Plenio

    Photosynthetic systems utilize adaptability to respond efficiently to fluctuations in their light environment. As a result, large photosynthetic yields can be achieved in conditions of low light intensity, while photoprotection mechanisms are activated in conditions of elevated light intensity. In sharp contrast with these observations, current theoretical models predict bacterial cell death for physiologically

    更新日期:2020-07-27
  • Spatial measurement of axial and radial momentum fluxes of a plasma expanding in a magnetic nozzle
    New J. Phys. (IF 3.539) Pub Date : 2020-07-26
    Kazunori Takahashi, Takeharu Sugawara and Akira Ando

    Spatial profiles of axial and radial momentum fluxes of a plasma expanding in a magnetic nozzle is revealed by using a momentum vector measurement instrument located downstream of a radiofrequency plasma source, where the radial and axial forces exerted to the detector plate facing the source side are independently, directly, and simultaneously obtained. It is shown that a conical structure having

    更新日期:2020-07-27
  • Nonlinear power dependence of the spectral properties of an optical parametric oscillator below threshold in the quantum regime
    New J. Phys. (IF 3.539) Pub Date : 2020-07-26
    Golnoush Shafiee, Dmitry V Strekalov, Alexander Otterpohl, Florian Sedlmeir, Gerhard Schunk, Ulrich Vogl, Harald G L Schwefel, Gerd Leuchs and Christoph Marquardt

    Photon pairs and heralded single photons, obtained from cavity-assisted parametric down conversion (PDC), play an important role in quantum communications and technology. This motivated a thorough study of the spectral and temporal properties of parametric light, both above the optical parametric oscillator (OPO) threshold, where the semiclassical approach is justified, and deeply below it, where the

    更新日期:2020-07-27
  • Eden growth models for flat clathrin lattices with vacancies
    New J. Phys. (IF 3.539) Pub Date : 2020-07-26
    Felix Frey, Delia Bucher, Kem A Sochacki, Justin W Taraska, Steeve Boulant and Ulrich S Schwarz

    Clathrin-mediated endocytosis is one of the major pathways by which cells internalise cargo molecules. Recently it has been shown that clathrin triskelia can first assemble as flat lattices before the membrane starts to bend. However, for fully assembled clathrin lattices high energetic and topological barriers exist for the flat-to-curved transition. Here we explore the possibility that flat clathrin

    更新日期:2020-07-27
  • Critical heat current for operating an entanglement engine
    New J. Phys. (IF 3.539) Pub Date : 2020-07-26
    Shishir Khandelwal, Nicolas Palazzo, Nicolas Brunner and Géraldine Haack

    Autonomous entanglement engines have recently been proposed to generate steady-state bipartite and multipartite entanglement exploiting only incoherent interactions with thermal baths at different temperatures. In this work, we investigate the interplay between heat current and entanglement in a two-qubit entanglement engine, deriving a critical heat current for successful operation of the engine,

    更新日期:2020-07-27
  • Step-edge assisted large scale FeSe monolayer growth on epitaxial Bi 2 Se 3 thin films
    New J. Phys. (IF 3.539) Pub Date : 2020-07-26
    J Fikáček, P Procházka, V Stetsovych, S Průša, M Vondráček, L Kormoš, T Skála, P Vlaic, O Caha, K Carva, J Čechal, G Springholz and J Honolka

    Enhanced superconductivity of FeSe in the 2D limit on oxide surfaces as well as the prediction of topological superconductivity at the interface to topological insulators makes the fabrication of Fe-chalcogenide monolayers a topic of current interest. So far superconductive properties of the latter are mostly studied by scanning tunneling spectroscopy, which can detect gaps in the local density of

    更新日期:2020-07-27
  • Polarization-resolved analysis of high-order harmonic generation in monolayer MoS 2
    New J. Phys. (IF 3.539) Pub Date : 2020-07-26
    Candong Liu, Yinghui Zheng, Zhinan Zeng and Ruxin Li

    We employ a theoretical model based on the density-matrix equation in the velocity gauge to calculate high harmonic generation from monolayer MoS 2 . This approach incorporates the tight-binding model, enabling the full consideration of both crystal symmetry and multiple band effects. In additional to the usual odd harmonics, even harmonics are also presented in the case of observing two different

    更新日期:2020-07-27
  • Two-dimensional spectroscopy of Rydberg gases
    New J. Phys. (IF 3.539) Pub Date : 2020-07-23
    K Mukherjee, H P Goswami, S Whitlock, S Wüster and A Eisfeld

    Two-dimensional (2D) spectroscopy uses multiple electromagnetic pulses to infer the properties of a complex system. A paradigmatic class of target systems are molecular aggregates, for which one can obtain information on the eigenstates, various types of static and dynamic disorder and on relaxation processes. However, two-dimensional spectra can be difficult to interpret without precise knowledge

    更新日期:2020-07-24
  • Dielectric function decomposition by dipole interaction distribution: application to triclinic K 2 Cr 2 O 7
    New J. Phys. (IF 3.539) Pub Date : 2020-07-23
    C Sturm, S Höfer, K Hingerl, T G Mayerhöfer and M Grundmann

    Here we present a general approach for the description for the frequency dependent dielectric tensor coefficients for optically anisotropic materials. Based on symmetry arguments we show that the components of the dielectric tensor are in general not independent of each other. For each excitation there exists an eigensystem, where its contribution to the dielectric tensor can be described by a diagonal

    更新日期:2020-07-24
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