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  • Searching for top quark pair production cross-section at LHeC and FCC-eh
    EPL (IF 1.958) Pub Date : 2020-07-05
    B. Rezaei and G. R. Boroun

    The deep inelastic scattering mode of ##IMG## [http://ej.iop.org/images/0295-5075/130/5/51002/epl20182ieqn1.gif] {$t\overline{t}$} pair production at the proposed LHeC and FCC-eh is considered. We present a method to extract the top reduced cross-section related to the transversal structure function F 2 ( x , Q 2 ) parameterization. Numerical calculations with known kinematics of the LHeC and FCC-eh

  • Experimental study of auto-tuning piezoelectric energy harvester attaching balls in boxes
    EPL (IF 1.958) Pub Date : 2020-07-05
    Lihua Chen, Liqi Chang, Jiangtao Xue and Haoqun Li

    In this paper, an auto-tuning piezoelectric energy harvester (PEH) based on the cantilever plate is presented by attaching a box to each corner of the free sides and placing a ball in each box. The prototype and supporting experimental fixtures were designed and manufactured. A series of hammering experiments are carried out to measure the natural frequency of the device according to different whole

  • Branched Josephson junctions: Current carrying solitons in external magnetic fields
    EPL (IF 1.958) Pub Date : 2020-07-05
    D. Matrasulov, K. Sabirov, D. Babajanov and H. Susanto

    We consider the branched Josephson junction created by planar superconductors connected to each other through the Y-junction insulator. Assuming that the structure interacts with the external constant magnetic field, we study static sine-Gordon solitons in such system by modeling them in terms of the stationary sine-Gordon equation on metric graph. Exact analytical solutions of the problem are obtained

  • Flocking and reorientation transition in the 4-state active Potts model
    EPL (IF 1.958) Pub Date : 2020-07-05
    Swarnajit Chatterjee, Matthieu Mangeat, Raja Paul and Heiko Rieger

    We study the active 4-state Potts model (APM) on the square lattice in which active particles have four internal states corresponding to the four directions of motion. A local alignment rule inspired by the ferromagnetic 4-state Potts model and self-propulsion via biased diffusion according to the internal particle states leads to flocking at high densities and low noise. We compute the phase diagram

  • Large-detecting-area and high-withstanding-voltage UV detectors with tunable responsivity enhancement by mediation of density of Ag nanoparticles
    EPL (IF 1.958) Pub Date : 2020-07-02
    Gaoming Li, Jingwen Zhang, Qi Cao and Yongning He

    To detect and measure the UV arcs generated between electric power transmission facilities, high-performance large-detecting-area and high-withstanding-voltage UV detectors are badly needed in the application field of electric power transmission. Considering the performance of the detector would degenerate with increasing detecting area, we introduced Ag nanoparticles (NPs) as a plasmonic structure

  • Towards theoretical framework for probing the accuracy limit of electronic transport properties of SnSe 2 using many-body calculations
    EPL (IF 1.958) Pub Date : 2020-07-02
    Osama Jalil, Shahzad Ahmad, Xinke Liu, Kah Wee Ang and Usman Younis

    A theoretical framework to investigate the accuracy limit of phonon-limited carrier mobility in intrinsic n-type SnSe 2 has been developed by solving the Boltzmann transport equation based on ab initio calculated electron-phonon interactions. The electron-phonon coupling matrix elements have been computed using maximally localized Wannier functions and density functional perturbation theory. The intrinsic

  • Electric simulation of silicon drift detector for single photon measurement
    EPL (IF 1.958) Pub Date : 2020-07-02
    Yang Liu, Junfeng Huang, Shu Cai and Xiaoping Ouyang

    The silicon drift detector (SDD) with high quantum efficiency, energy resolution and time resolution is an advanced single photon counting detector in the fields of quantum communication, X-ray communication and pulsar navigation. In this paper we design an optimum SDD structure with circular drift rings and linear-type voltage divider, the device electric characteristics are simulated using a 3D Sentaurus

  • Is there a Mott-glass phase in a one-dimensional disordered quantum fluid with linearly confining interactions?
    EPL (IF 1.958) Pub Date : 2020-07-02
    Nicolas Dupuis

    We study a one-dimensional disordered quantum fluid with linearly confining interactions (disordered Schwinger model) using bosonization and the nonperturbative functional renormalization group. We find that the long-range interactions make the Anderson-insulator (or, for bosons, the Bose-glass) fixed point (corresponding to a compressible state with a gapless optical conductivity) unstable, even if

  • Probing AdS/QCD backgrounds with semi-classical strings
    EPL (IF 1.958) Pub Date : 2020-07-02
    Saulo Diles

    New AdS/QCD backgrounds have been proposed to describe the spectrum of heavy vector mesons via the implementation of additional energy scales on the bulk geometry of the soft-wall model. The extra energy scales are needed to include the decay constants of hadronic states when describing the radial excitations of the heavy meson. Here we analyze one model that introduces an ultraviolet cutoff on Anti-de

  • On unified field theory for strong fields
    EPL (IF 1.958) Pub Date : 2020-07-01
    Trzetrzelewski Maciej

    We consider a metric consisting of a gravitational background part and an electromagnetic part. We show that the Lorentz force equations follow exactly from the geodesic equation for this metric and that in the Dirac gauge the Einstein-Hilbert action reduces to gravitation with electromagnetism as long as the background part is much stronger than the electromagnetic one.

  • The condensation of a spin-orbit coupled Bose gas in a uniform gravitational field
    EPL (IF 1.958) Pub Date : 2020-07-01
    Pei-Song He

    In this paper, we consider the effect of a uniform gravitational field on a spin-orbit coupled Bose gas. In a semiclassical approximation, we find that the gravitational field triggers Bose-Einstein condensation at finite temperature. For weak gravitational field, the critical temperature increases as the gravitational field goes more intense. And it first increases and then decreases along with increasing

  • Non-Ergodicity in open quantum systems through quantum feedback
    EPL (IF 1.958) Pub Date : 2020-06-29
    Lewis A. Clark, Fiona Torzewska, Ben Maybee and Almut Beige

    It is well known that quantum feedback can alter the dynamics of open quantum systems dramatically. In this paper, we show that non-Ergodicity may be induced through quantum feedback and resultantly create system dynamics that have lasting dependence on initial conditions. To demonstrate this, we consider an optical cavity inside an instantaneous quantum feedback loop, which can be implemented relatively

  • Structural feedback in the control of complex networks
    EPL (IF 1.958) Pub Date : 2020-06-29
    Sen Nie, H. Eugene Stanley, Shi-Ming Chen, Bing-Hong Wang and Xu-Wen Wang

    Feedback is one of the most powerful influences in dynamical systems, performing a fundamental function in self-regulating processes. However, it is not known whether the underlying control of networked systems is associated with feedback. Here, we analyze structural feedback, defined by adding directed links from controlled nodes to driver nodes, to determine the control energy requirement of networked

  • How the mass of a scalar field influences resonance Casimir-Polder interaction in Schwarzschild spacetime
    EPL (IF 1.958) Pub Date : 2020-06-29
    Arpan Chatterjee, Saptarshi Saha and Chiranjeeb Singha

    Resonance Casimir-Polder interaction ( RCPI ) occurs in nature when two or more atoms are in their excited states and the exchange of a real photon occurs between them due to vacuum fluctuations of the quantum fields. In recent times, many attempts have been made to show that some curved spacetimes can be differentiated from a thermal Minkowski spacetime by using the RCPI . Motivated by these ideas

  • Spin transport and dynamic properties of two-dimensional spin-momentum locked states
    EPL (IF 1.958) Pub Date : 2020-06-29
    Ping Tang, Xiufeng Han and Shufeng Zhang

    Materials with spin-momentum locked surface or interface states provide an interesting playground for studying physics and application of charge-spin current conversion. To characterize their non-equilibrium magnetic and transport properties in the presence of a time-dependent external magnetic field and a spin injection from a contact, we introduce three macroscopic variables: a vectorial helical

  • Ultra-long-lived quasi-normal modes of neutron stars in massive scalar-tensor gravity
    EPL (IF 1.958) Pub Date : 2020-06-25
    Jose Luis Blázquez-Salcedo, Fech Scen Khoo and Jutta Kunz

    The spectrum of frequencies and characteristic times that compose the ringdown phase of gravitational waves emitted by neutron stars carries information about the matter content (the equation of state) and the underlying theory of gravity. Typically, modified theories of gravity introduce additional degrees of freedom/fields, such as scalars, which result in new families of modes composing the ringdown

  • Quantum random access codes and incompatibility of measurements
    EPL (IF 1.958) Pub Date : 2020-06-25
    Claudio Carmeli, Teiko Heinosaari and Alessandro Toigo

    It is one of the peculiar features of quantum physics that some sets of measurements are incompatible in the sense that they cannot be performed simultaneously. Incompatibility is an important quantum resource as it enables Bell nonlocality and steering. Here we show that incompatibility is crucial also in certain communication tasks; we prove that quantum random access code performs better than its

  • Non-locality and time-dependent boundary conditions: A Klein-Gordon perspective
    EPL (IF 1.958) Pub Date : 2020-06-25
    Samuel Colin and Alex Matzkin

    The dynamics of a particle in an expanding cavity is investigated in the Klein-Gordon framework in a regime in which the single-particle picture remains valid. The cavity expansion represents a time-dependent boundary condition for the relativistic wave function. We show that this expansion induces a non-local effect on the current density throughout the cavity. Our results indicate that a relativistic

  • Realizing arbitrary trapping potentials for light via direct laser writing of mirror surface profiles
    EPL (IF 1.958) Pub Date : 2020-06-22
    Christian Kurtscheid, David Dung, Andreas Redmann, Erik Busley, Jan Klaers, Frank Vewinger, Julian Schmitt and Martin Weitz

    The versatility of quantum gas experiments greatly benefits from the ability to apply variable potentials. Here we describe a method which allows the preparation of potential structures for microcavity photons via spatially selective deformation of optical resonator geometries with a heat-induced mirror surface microstructuring technique. We investigate the thermalization of a two-dimensional photon

  • Effect of chain length on structure and dynamics in a melt of semiflexible rings
    EPL (IF 1.958) Pub Date : 2020-06-22
    Jian Li and Bokai Zhang

    We investigate structure and dynamics of semiflexible rings in a melt by molecular dynamics simulation. Our research mainly focuses on chain length effect. We observe a power law of the intrachain structure factor of rings at intermediate length scale. The fractal dimensions of 1 and 3 at different length scales are reported. By analytical expression for the intrachain structure factor, the value of

  • Transitions of the anomalous positive longitudinal magnetoconductivity of a Weyl semimetal in an ac electric field
    EPL (IF 1.958) Pub Date : 2020-06-22
    H. Yu, L. Sheng and D. Y. Xing

    Considering the Landau quantization and chiral anomaly, we develop a semiclassical theory of the positive longitudinal magnetoconductivity (LMC) of a Weyl semimetal induced by the chiral anomaly in an ac driving electric field. We find that for low angular frequencies, the anomalous LMC behaves in the same manner as in the dc case. However, the LMC decreases rapidly to zero with increasing the angular

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