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  • Entropic considerations on the Universe and Universe-black hole systems
    EPL (IF 1.958) Pub Date : 2020-09-21
    H. Hadi, F. Darabi and Y. Heydarzade

    We study the entropic considerations on the Universe system and the Universe-black hole system, filled by cosmological constant or exotic quintessence-like and phantom-like fields having negative pressure, using their relevant entropic bounds. It turns out that for both systems these considerations single out the cosmological constant, among the negative pressure candidate fields, as the viable cosmological

    更新日期:2020-09-22
  • A tunable silicon-on-insulator valley Hall photonic crystal at telecommunication wavelengths
    EPL (IF 1.958) Pub Date : 2020-09-21
    ZhaoHui Dong, Feng Xu and Wenyao Liang

    Silicon-on-insulator (SOI) combined with topological photonics provides on-chip integrated photonic devices CMOS-compatibility and backscattering-suppression. Here we propose a tunable SOI-based valley Hall topological insulator with two nonequivalent air holes to break inversion symmetry. Due to free-carrier excitation, the real and imaginary parts of the refractive index are modified to cause a blue-shift

    更新日期:2020-09-22
  • Statistically significant observation of and cross-sections for a new nuclear reaction channel on 197 Au with bound dineutron escape
    EPL (IF 1.958) Pub Date : 2020-09-21
    Ihor M. Kadenko, Barna Biró and András Fenyvesi

    A new nuclear reaction channel on 197 Au with the neutron as a projectile and a bound dineutron ( 2 n) as an ejectile in the output channel is considered based on available experimental observations. The dineutron is assumed to be formed as a particle satellite, separated from the volume but not from the potential well of the 196 Au nucleus. The dineutron was identified by statistically significant

    更新日期:2020-09-22
  • The classical Doppler-broadened absorption line profile due to thermal effect
    EPL (IF 1.958) Pub Date : 2020-09-20
    Young-Sea Huang

    The classical Doppler-broadened absorption line profile, which is exactly derived by the classical Doppler effect and Maxwell speed distribution for the first time, is asymmetrically broadened with red-shift more than blue-shift, and its peak is red-shifted. Nonetheless, the half-width at half-maximum in the blue-shift wing is larger than that in the red-shift wing. The classical Doppler-broadened

    更新日期:2020-09-21
  • Multiband effect in elastoresistance of Fe(Se,Te)
    EPL (IF 1.958) Pub Date : 2020-09-20
    Y. A. Ovchenkov, D. A. Chareev, D. E. Presnov, I. G. Puzanova, O. S. Volkova and A. N. Vasiliev

    We have investigated the elastoresistance of two ##IMG## [http://ej.iop.org/images/0295-5075/131/5/57001/epl20272ieqn1.gif] {${\text{FeSe}}_{1-x}$} Te x ( ##IMG## [http://ej.iop.org/images/0295-5075/131/5/57001/epl20272ieqn2.gif] {$x\approx 0.4\text{--}0.5$} ) compounds that have a close chemical composition but differ significantly in electronic properties. The first compound has a negative temperature

    更新日期:2020-09-21
  • A variant of the unknotting number of a knot with applications to the topology of biomolecules
    EPL (IF 1.958) Pub Date : 2020-09-20
    U. Ali, M. Saleem, A. M. Qureshi, I. Riaz, M. Shah and W. Gao

    The creation of unwound or unknotted loops of DNA is facilitated by topoisomerases, which alter the conformation of DNA by cleaving the phosphate backbone on one or both the strands. A major unexplored question has been the possibility of topoisomerases failing to unpack supercoiled DNA on any one of the several knots, thereby failing to initiate the unwinding process. Computing the unknotting number

    更新日期:2020-09-21
  • Measurement of modular values and connection to the annihilation operator
    EPL (IF 1.958) Pub Date : 2020-09-20
    Xiaogang Li and Jiancun Gao

    Modular value of an observable of a pre- and postselected quantum system is a concept similar to weak value, but in contrast to describing only weak coupling, it can describe the coupling of any strength but only for qubit meters, so it may be used more widely in some scenarios. Besides, modular value has been proved to have advantages on measuring weak values of nonlocal joint observables and nonlocal

    更新日期:2020-09-21
  • Measurements of microwave scattering by ultrasound in air at oblique incidence
    EPL (IF 1.958) Pub Date : 2020-09-20
    Niklas Wingren and Daniel Sjöberg

    Scattering of electromagnetic waves against acoustic waves has been studied in acousto-optics and radio acoustic sounding of the atmosphere, among others. Strong interaction requires phase matching, which occurs at two angles between waves. These depend on the wavelength ratio. The scattered electromagnetic wave is frequency shifted by the acoustic frequency, either up or down depending on the angle

    更新日期:2020-09-21
  • Kinematic basis of emergent energetics of complex dynamics
    EPL (IF 1.958) Pub Date : 2020-09-20
    Hong Qian, Yu-Chen Cheng and Ying-Jen Yang

    Stochastic kinematic description of a complex dynamics is shown to dictate an energetic and thermodynamic structure. An energy function ##IMG## [http://ej.iop.org/images/0295-5075/131/5/50002/epl20266ieqn1.gif] {$\varphi(\textbf{x})$} emerges as the limit of the generalized, nonequilibrium free energy of a Markovian dynamics with vanishing fluctuations. In terms of the ∇ φ and its orthogonal field

    更新日期:2020-09-21
  • Extraordinary characteristics of one-dimensional PT-symmetric ring optical waveguide networks with near-isometric and isometric arms
    EPL (IF 1.958) Pub Date : 2020-09-17
    Haiying Li, Xiangbo Yang, Jiaye Wu and Xuhang Wu

    We construct one-dimensional ##IMG## [http://ej.iop.org/images/0295-5075/131/5/54001/epl20249ieqn2.gif] {$\cal{PT}$} -symmetric ring optical waveguide networks with near-isometric and isometric arms and investigate their extraordinary optical properties. It is found that the features for the former and the latter are quite different, although extraordinary ultrastrong transmission and reflection exist

    更新日期:2020-09-21
  • A network-based method for detecting critical events of correlation dynamics in financial markets
    EPL (IF 1.958) Pub Date : 2020-09-17
    Chun-Xiao Nie

    In recent years, the dynamics of the financial correlation matrix has been widely studied. This study applies the Frobenius distance-based kNN ( k nearest neighbour) network to analyse the time-varying characteristics of the correlation matrix, especially during the period of drastic change. We use the influence-strength ( IS ) index to detect when the correlation matrix structure changes dramatically

    更新日期:2020-09-20
  • Resonant nano-electromechanical systems from 2D materials
    EPL (IF 1.958) Pub Date : 2020-09-17
    Kai-Ming Hu, Peng Bo, Xiu-Yuan Li, Yi-Hang Xin, Xin-Ru Bai, Lei Li and Wen-Ming Zhang

    Intriguing mechanical properties of two-dimensional (2D) atomically thin materials make them well suit for a new class of resonant NEMS. Resonant 2D NEMS show high fundamental frequencies, outstanding tenability and broad dynamic range due to the ultrahigh strength, ultralow mass density and ultrahigh strain stretchability. Recent work toward exploring fabrication and transduction techniques, device

    更新日期:2020-09-20
  • Equal partners do better in defensive alliances
    EPL (IF 1.958) Pub Date : 2020-09-17
    Marcell Blahota, István Blahota and Attila Szolnoki

    Cyclic dominance offers not just a way to maintain biodiversity, but also serves as a sort of defensive alliance against an external invader. Interestingly, a new level of competition can be observed when two cyclic loops are present. Here the inner invasion speed plays a decisive role on the evolutionary outcome, because faster invasion rate provides an evolutionary advantage to an alliance. In this

    更新日期:2020-09-20
  • Rydberg antiblockade regimes: Dynamics and applications
    EPL (IF 1.958) Pub Date : 2020-09-16
    S.-L. Su, F.-Q. Guo, J.-L. Wu, Z. Jin, X. Q. Shao and S. Zhang

    Rydberg antiblockade (RAB) allows more than one Rydberg atom to be excited in the presence of Rydberg-Rydberg interaction (RRI) and has many potential applications in quantum optics, many-body physics and quantum information. In this paper, we would review the conditions and possible applications of different types of RAB regimes under weak, intermediate and strong RRIs, respectively. Both van der

    更新日期:2020-09-18
  • Measurement-device–independent quantum secure direct communication of multiple degrees of freedom of a single photon
    EPL (IF 1.958) Pub Date : 2020-09-07
    Zi-Kang Zou, Lan Zhou, Wei Zhong and Yu-Bo Sheng

    Quantum secure direct communication (QSDC) can realize the direct and secure transmission of information instead of sharing secure keys between two parties. Similar to quantum key distribution (QKD), in practical applications, QSDC may suffer from attacks from imperfect detector. Measurement-device–independent QSDC (MDI-QSDC) can remove all attacks at detector's side and close all loopholes in the

    更新日期:2020-09-08
  • f(R) gravity and Tsallis holographic dark energy
    EPL (IF 1.958) Pub Date : 2020-09-06
    P. S. Ens and A. F. Santos

    The f ( R ) gravity theory is considered. It is a gravitational theory that generalizes the Einstein-Hilbert action. In this context, a holographic dark energy model is studied. Tsallis non-extensive entropy is used to introduce the dark energy density based on the holographic principle. Then the Friedmann equation, deceleration parameter, and equation of state for this model are investigated.

    更新日期:2020-09-08
  • Lost in normalization
    EPL (IF 1.958) Pub Date : 2020-09-06
    Narges Vadood and Amir H. Fatollahi

    The consequences of the gauge-coupling–dependent normalization factor of ##IMG## [http://ej.iop.org/images/0295-5075/131/4/41003/epl20258ieqn1.gif] {$1/g^{\alpha}$} in the transfer matrix of 2d U (1) lattice gauge theory are explored. It is seen by the ##IMG## [http://ej.iop.org/images/0295-5075/131/4/41003/epl20258ieqn2.gif] {$\alpha=1$} choice that the lowest energy develops a minimum at coupling

    更新日期:2020-09-08
  • Effect of spacing on evaporation and internal circulation of two identical drops
    EPL (IF 1.958) Pub Date : 2020-09-06
    Vartika Singh, Suraj Prasad, Ankit Das, S. Narayanan and Deepak Kumar Mandal

    When two identical drops evaporate simultaneously in close vicinity, the vapours of one drop affect the evaporation of the neighbouring one. The evaporation rate is found to decrease. The effect decreases when the in between spacing increases. The internal circulation, which is visualized, is observed to show the same behaviour. The circulation is slower for the nearer drops, but increases and becomes

    更新日期:2020-09-08
  • Restoring number conservation in quadratic bosonic Hamiltonians with dualities
    EPL (IF 1.958) Pub Date : 2020-09-06
    Vincent P. Flynn, Emilio Cobanera and Lorenza Viola

    Number-non-conserving terms in quadratic bosonic Hamiltonians can induce unwanted dynamical instabilities. By exploiting the pseudo-Hermitian structure built in to these Hamiltonians, we show that as long as dynamical stability holds, one may always construct a non-trivial dual (unitarily equivalent) number-conserving quadratic bosonic Hamiltonian. We exemplify this construction for a gapped harmonic

    更新日期:2020-09-08
  • How to generate the tip of branching random walks evolved to large times
    EPL (IF 1.958) Pub Date : 2020-09-06
    É. Brunet, A. D. Le, A. H. Mueller and S. Munier

    In a branching process, the number of particles increasesexponentially with time, which makes numerical simulations for large timesdifficult. In many applications, however, only the region close to the extremalparticles is relevant (the “tip”). We present a simple algorithmwhich allows to simulate a branching random walk in one dimension, keepingonly the particles that arrive within some distance of

    更新日期:2020-09-08
  • Locating source of heterogeneous propagation model by universal algorithm
    EPL (IF 1.958) Pub Date : 2020-09-06
    Hong-Jue Wang and Kai-Jia Sun

    We focus on locating propagation source in complex networks. A novel and simple universal algorithm is proposed to accurately locate source of different heterogeneous propagation models by using only limited observed information without knowing anything about propagation models in advance. An observer nodes selecting strategy is proposed to improve the source locating accuracy of the proposed algorithm

    更新日期:2020-09-08
  • Barrier crossing in the presence of multi-exponential memory functions with unequal friction amplitudes and memory times
    EPL (IF 1.958) Pub Date : 2020-09-06
    Laura Lavacchi, Julian Kappler and Roland R. Netz

    We study the non-Markovian Langevin dynamics of a massive particle in a one-dimensional double-well potential in the presence of multi-exponential memory by simulations. We consider memory functions as the sum of two or three exponentials with different friction amplitudes ##IMG## [http://ej.iop.org/images/0295-5075/131/4/40004/epl20260ieqn1.gif] {$\gamma_i$} and different memory times ##IMG## [http://ej

    更新日期:2020-09-08
  • Improvement of CO 2 absorption by ionic liquid electrospray
    EPL (IF 1.958) Pub Date : 2020-09-02
    H. Takana, K. Yamamoto, T. Makino and M. Kanakubo

    In this study, an innovative approach for the selective absorption of carbon dioxide (CO 2 ) by ionic liquid electrospray was proposed. First, the fluid dynamical characteristics of ionic liquid electrospray with 1-ethyl-3-methylimidazolium acetate in ambient air was clarified by high-speed imaging and aerosol analysis. This was followed by enhancement of CO 2 absorption by ionic liquid electrospray

    更新日期:2020-09-03
  • The optimal oscillation mode in excitable small-world networks
    EPL (IF 1.958) Pub Date : 2020-09-02
    Yu Qian, Chi Zhang, Zegang Wei, Fei Liu, Chenggui Yao and Zhigang Zheng

    The problem of oscillation mode recognition is one of the most important issues under investigation in the field of biological systems. In this paper, we have systematically investigated the optimal oscillation mode (OOM) identification in excitable small-world networks (ESWNs). It has been shown that rewiring probability, coupling strength and system size are the three determinants that can effectively

    更新日期:2020-09-03
  • Revealing hidden symmetries and gauge invariance of the massive Carroll-Field-Jackiw model
    EPL (IF 1.958) Pub Date : 2020-09-02
    Paulo R. F. Alves, Cleber N. Costa, Everton M. C. Abreu, Jorge Ananias Neto and Albert C. R. Mendes

    In this paper we have analyzed the improved version of the Gauge Unfixing (GU) formalism of the massive Carroll-Field-Jackiw model, which breaks both the Lorentz and gauge invariances, to disclose hidden symmetries to obtain gauge invariance, the key stone of the Standard Model. In this process, as usual, we have converted this second-class system into a first-class one and we have obtained two gauge

    更新日期:2020-09-03
  • Fuzzy dark matter and neutron Majorana mass from gravitational instantons
    EPL (IF 1.958) Pub Date : 2020-09-02
    Andrea Addazi

    We explore the possibility that a super-light candidate for fuzzy (or wave) Dark Matter (fDM) may be a new composite boson state of fermions, rather than an axion-like Bose-Einstein condensate. We start from string-inspired massless Majorana fermions χ thought as super-modulini fields from string compactifications. We show that massless (or nearly massless) fermions can form a Bose-Einstein condensate

    更新日期:2020-09-03
  • Cutting off the non-Hermitian boundary from an anomalous Floquet topological insulator
    EPL (IF 1.958) Pub Date : 2020-09-02
    Bastian Höckendorf, Andreas Alvermann and Holger Fehske

    In two-dimensional anomalous Floquet insulators, non-Hermitian boundary state engineering can be used to completely separate chiral boundary states from bulk bands in the quasienergy spectrum. The topological properties of such spectrally separated boundary states are no longer restricted by the strict bulk-boundary correspondence of Hermitian systems. We show that this additional topological freedom

    更新日期:2020-09-03
  • How the intimate relationship affects the individuals' behaviors in a two-layer network
    EPL (IF 1.958) Pub Date : 2020-09-02
    Jie Lu, Linrong Zhang and Mengyun Wu

    Game theories could help us to understand the origin of the emergence and persistence of cooperation among selfish individuals. Considering the intimate relationship among individuals, we study the prisoner's dilemma (PD) game in a two-layer network. Firstly, we calculate the closeness between any two players according to their connectivity. Further, we define and obtain one's comprehensive income

    更新日期:2020-09-03
  • A continuum study of ionic layer analysis for single species ion transport in coaxial carbon nanotubes
    EPL (IF 1.958) Pub Date : 2020-09-02
    Yue Chan

    In this letter, we employ the Poisson-Nernst-Planck equation and the continuum molecular model to investigate the ionic layers formation in coaxial carbon nanotubes, which are crucial for understanding the ion transport in nanomaterials, as well as modern solar cells and batteries. Owing to the curvature of nanotubes and the strong ion-nanotubes interactions, our simulations show that stable ionic

    更新日期:2020-09-03
  • Closed-loop three-level charged quantum battery
    EPL (IF 1.958) Pub Date : 2020-09-02
    Fu-Quan Dou, Yuan-Jin Wang and Jian-An Sun

    Quantum batteries are energy storage or extraction devices in a quantum system. Here, we present a closed-loop quantum battery by utilizing a circularly coupled three-state quantum system, and investigate its charging dynamics. The charging performance is greatly improved due to the existence of the third field in the system to form a closed-contour interaction. Through appropriately selecting the

    更新日期:2020-09-03
  • Electromagnetic vortex solitons in the magnetospheres of super-Eddington AGN
    EPL (IF 1.958) Pub Date : 2020-09-02
    V. I. Berezhiani and Z. Osmanov

    Propagation and dynamics of electromagnetic vortex solitons have been studied in the electron positron ion plasmas of super-Eddington active galactic nuclei (AGN). Existence and stability of such structures is demonstrated for highly transparent AGN plasma media. Possible implications of dynamical features and corresponding observational signatures are discussed.

    更新日期:2020-09-03
  • Spin-half bosons with mass dimension three-half: Towards a resolution of the cosmological constant problem
    EPL (IF 1.958) Pub Date : 2020-09-02
    Dharam Vir Ahluwalia

    We have constructed a very different type of particle than any presently known. It is a boson and resides in the ##IMG## [http://ej.iop.org/images/0295-5075/131/4/41001/epl20257ieqn1.gif] {$(1/2,0)\oplus(0,1/2)$} representation space. The associated local field has mass dimension three-half. These new bosons can only be created or destroyed in pairs. When paired with a fermion the total zero point

    更新日期:2020-09-03
  • Wigner's friend, Feynman's paths and material records
    EPL (IF 1.958) Pub Date : 2020-09-02
    A. Matzkin and D. Sokolovski

    The place and role of an Observer in quantum mechanics has been a subject of an ongoing debate since the theory's inception. Wigner brought this question to the fore in a celebrated scenario in which a super-Observer observes a Friend making a measurement. Here we briefly review why this “Wigner Friend scenario” has been taken to require the introduction of the Observer's consciousness, or alternatively

    更新日期:2020-09-03
  • Confronting γ-rays from singlet fermionic cold dark matter with the H.E.S.S. data
    EPL (IF 1.958) Pub Date : 2020-09-02
    R. Moazzemi

    We explore the whole parameter space of the singlet fermionic cold-dark-matter model with respect to constraints on, first, the relic density and second, gamma-ray lines up to 10 TeV. We investigate 44000 random sample models which comprehensively scan the parameter space for dark-matter mass below 10 TeV, and compare our results with the latest experimental data from H.E.S.S., for the first time.

    更新日期:2020-09-03
  • Inhomogeneous superconductivity in high-density nonmagnetic cobalt in a polycrystalline Co film
    EPL (IF 1.958) Pub Date : 2020-09-02
    Nasrin Banu, M. Aslam, Arpita Paul, Sanjib Banik, S. Das, S. Datta, A. Roy, I. Das, G. Sheet, U. V. Waghmare, S. Ramakrishnan and B. N. Dev

    We report the observation of inhomogeneous superconductivity (ISC) in the recently discovered high-density nonmagnetic (NM) phase of Co in thin films below an onset temperature ( ##IMG## [http://ej.iop.org/images/0295-5075/131/4/47001/epl20262ieqn1.gif] {$T_{\mathrm{C}}$} ) of 5.4 K in the absence of external magnetic field, via four-probe measurements of resistivity. Further, the point-contact spectroscopy

    更新日期:2020-09-03
  • Event-by-event fluctuations of maximum particle density with respect to the width of the pseudo-rapidity interval at a few A GeV/c
    EPL (IF 1.958) Pub Date : 2020-09-02
    Swarnapratim Bhattacharyya

    A detailed study of event-by-event fluctuations of maximum particle density of the produced particles with respect to the width of the pseudo-rapidity interval in terms of the scaled variance ω has been carried out for 16 O-AgBr, 28 Si-AgBr and 32 S-AgBr interactions at 4.5 A GeV/ c . For all the interactions the values of scaled variance are found to be greater than one indicating the presence of

    更新日期:2020-09-03
  • Mechanism of mass expulsion from the surface of a pure tungsten cathode during dc arc initiation
    EPL (IF 1.958) Pub Date : 2020-09-02
    M. A. Sargsyan, D. V. Tereshonok, M. Kh. Gadzhiev and A. S. Tyuftyaev

    In this work the destruction mechanism of a pure tungsten cathode during the initiation of direct current arc is studied. The experimental work shows that the cathode resides in liquid form during the initiation of the arc, and the process of its destruction happens by ejecting droplets from its surface with the following explosion. The average speed of the ejection and the temperature at the explosion

    更新日期:2020-09-03
  • Harnessing currents of particles for spectroscopy in small-ring lattices with binary mixtures
    EPL (IF 1.958) Pub Date : 2020-08-26
    L. Morales-Molina, S. A. Reyes and E. Arévalo

    We propose a method to probe ground states with distinct properties in binary mixtures trapped in small-ring lattices. The technique exploits the nonequilibrium particle current behavior generated by a nonadiabatic change of the interaction between the species of the binary mixture. The analysis of the current fluctuations in the Fourier space reveals a correspondence between the frequency peaks and

    更新日期:2020-08-28
  • Light meson masses from baryon interaction states?
    EPL (IF 1.958) Pub Date : 2020-08-26
    Ole L. Trinhammer

    We examine interaction states between baryons in U (3) configurations. Such interaction states may represent the meson mass spectrum above the pion triplet. Our configuration space is the Lie group U (3) with a Hamiltonian structure for baryons as stationary states. Mesonic states come about via an interaction potential. The Hamiltonian can be diagonalized by a Rayleigh-Ritz method resulting in matrix

    更新日期:2020-08-28
  • Quantum multipartite maskers vs. quantum error-correcting codes
    EPL (IF 1.958) Pub Date : 2020-08-26
    K. Y. Han, Z. H. Guo, H. X. Cao, Y. X. Du and C. Yang

    Since masking of quantum information was introduced by Modi et al . in Modi K. et al ., Phys. Rev. Lett. , 120 (2018) 230501, many discussions on this topic have been published. In this paper, we explore the relationship between quantum multipartite maskers (QMMs) and quantum error-correcting codes (QECCs). We say that a subset Q of pure states of a system can be masked by an operator S into a multipartite

    更新日期:2020-08-28
  • Magneto-optical measurements of Maxwell displacement current
    EPL (IF 1.958) Pub Date : 2020-08-26
    Y. Kawamura

    The concept of Maxwell's displacement current is still not fully understood. In this paper, we measured the magnetic field between the plates of a charging capacitor using a magneto-optical method, which is generally explained to be produced by Maxwell's displacement current. We observed the asymmetric radial profile of the magnetic field between them, which could not be explained by using the displacement

    更新日期:2020-08-28
  • Behavioral observability and reputational-preference–based rewarding mechanism promotes cooperation in spatial social dilemmas
    EPL (IF 1.958) Pub Date : 2020-08-26
    Huayan Pei, Guanghui Yan and Huanmin Wang

    To explore the incentive mechanisms of cooperation, inspired by preference for reputation in indirect reciprocity and the influence of behavioral observability on fitness, we present a new rewarding mechanism by incorporating these two impact factors into the evaluation of fitness in the spatial prisoner's dilemma game (PDG), under which a dynamically changing reward is established for cooperative

    更新日期:2020-08-28
  • Ring-like vortices in a logarithmic generalized Maxwell theory
    EPL (IF 1.958) Pub Date : 2020-08-26
    F. C. E. Lima and C. A. S. Almeida

    We investigate the presence of vortex structures in a Maxwell model with a logarithmic generalization. This generalization becomes important because it generates stationary field solutions in models that describe the dynamics of a scalar field. In this work, we will choose to investigate the dynamics of the complex scalar field with the gauge field governed by the Maxwell term. For this, we will investigate

    更新日期:2020-08-28
  • Exceptional points and dynamics of a non-Hermitian two-level system without PT symmetry
    EPL (IF 1.958) Pub Date : 2020-08-25
    Qiu Wang, Jiao Wang, H. Z. Shen, S. C. Hou and X. X. Yi

    In this work, taking the most general non-Hermitian Hamiltonian without parity-time ##IMG## [http://ej.iop.org/images/0295-5075/131/3/34001/epl20234ieqn1.gif] {$(\mathcal{PT})$} symmetry and with non-Hermitian off-diagonal elements into account, we study the exceptional points of the model system. We find that there exists an exceptional ellipse in theory, compared with the exceptional ring studied

    更新日期:2020-08-28
  • New twinlike models for scalar fields
    EPL (IF 1.958) Pub Date : 2020-08-25
    D. Bazeia, L. Losano, M. A. Marques and R. Menezes

    This work investigates twinlike scalar field models that support kinks with the same energy density and stability. We find the first-order equations compatible with the equations of motion. We use them to calculate the conditions under which they attain the twinlike character. The linear stability is also investigated, and there we show that the addition of extra requirements may lead to the same stability

    更新日期:2020-08-27
  • Relativistic scalar charged particle in a rotating cosmic string space-time with Cornell-type potential and Aharonov-Bohm effect
    EPL (IF 1.958) Pub Date : 2020-08-25
    Faizuddin Ahmed

    In this paper, we study the Klein-Gordon equation subject to a magnetic quantum flux in the presence of a Cornell-type scalar and Coulomb-type vector potentials in a rotating cosmic string space-time. We solve the radial wave equation and evaluate the energy eigenvalues and eigenfunctions and analyze a relativistic analogue of Aharonov-Bohm effect for bound states.

    更新日期:2020-08-27
  • Moderate bandgap and high carrier mobility simultaneously realized in bilayer silicene by oxidation
    EPL (IF 1.958) Pub Date : 2020-08-25
    Yan Qian, Erjun Kan, Kaiming Deng and Haiping Wu

    Semiconductors simultaneously possessing high carrier mobility, moderate bandgap, and ambient environment stability are so important to modern industry, and Si-based semiconducting materials can match well with the previous silicon-based electronic components. Thus, searching for such Si-based semiconductors has been one hot project due to the lack of them nowadays. Here, with the help of density functional

    更新日期:2020-08-27
  • Role of lattice trapping for sliding friction
    EPL (IF 1.958) Pub Date : 2020-08-24
    J. Wang, A. Tiwari, I. M. Sivebaek and B. N. J. Persson

    Using molecular dynamics we study the dependence of the friction force on the sliding speed when an elastic slab (block) is sliding on a rigid substrate with a ##IMG## [http://ej.iop.org/images/0295-5075/131/2/24006/epl20228ieqn1.gif] {$\text{sin} (q_0 x)$} surface height profile. The friction force is nearly velocity independent due to phonon emission at the closing and opening crack tips, where rapid

    更新日期:2020-08-26
  • Topological transitions of spin-excitations in insulating chiral antiferromagnets
    EPL (IF 1.958) Pub Date : 2020-08-24
    S. A. Owerre

    We present a comprehensive study of strain-induced topological magnon phase transitions in insulating three-dimensional (3D) topological chiral antiferromagnets on the kagome-lattice. We show that by applying (100) uniaxial strain, 3D insulating antiferromagnetic Weyl magnons (WMs) manifest as an intermediate phase between a strain-induced 3D magnon Chern insulator (MCI) with integer Chern numbers

    更新日期:2020-08-26
  • Reinforcing a water bridge in a disjoint nanochannel
    EPL (IF 1.958) Pub Date : 2020-08-24
    X. W. Meng, Y. Li, L. Shen and X. Q. Yang

    Understanding and controlling water molecules confined in water channels has great applications. Many artificial water channels have been designed to mimic water permeation across water channels. One kind of artificial water channels, which contains two disjoint carbon nanotubes that are not physically connected has attracted much attention. Water transfers through the disjoint nanochannel by a water

    更新日期:2020-08-25
  • A nearly massless graviton in Einstein-Gauss-Bonnet inflation with linear coupling implies constant-roll for the scalar field
    EPL (IF 1.958) Pub Date : 2020-08-24
    V. K. Oikonomou and F. P. Fronimos

    The striking GW170817 event indicated that the graviton is nearly massless, since the gamma rays emitted from the two neutron stars merging arrived almost simultaneously with the gravitational waves. Thus, the graviton must also be massless during the inflationary and post-inflationary era, since there is no obvious reason to believe otherwise. In this letter we shall investigate the theoretical implications

    更新日期:2020-08-25
  • Viral vs. broadcast: Characterizing the virality and growth of cascades
    EPL (IF 1.958) Pub Date : 2020-08-24
    Yafei Zhang, Lin Wang, Jonathan J. H. Zhu and Xiaofan Wang

    Quantifying the virality of cascades is an important question across disciplines such as the transmission of disease, the spread of information and the diffusion of innovations. An appropriate virality metric should be able to disambiguate between a shallow, broadcast-like diffusion process and a deep, multi-generational branching process. Although several valuable works have been dedicated to this

    更新日期:2020-08-25
  • Enhanced photon blockade in quadratically coupled optomechanical system
    EPL (IF 1.958) Pub Date : 2020-08-24
    Kai Wang, Yong-Pan Gao, Ting-Tian Pang, Tie-Jun Wang and Chuan Wang

    We study the photon blockade effect in a mechanical engineered quadratic optomechanical system. It is shown that the energy level structure of the system and the statistical properties of the photons can both be influenced through the modulation of the motion of the mechanical components. Also, the second-order correlation function is analyzed for which the photon blockade can be enhanced under the

    更新日期:2020-08-25
  • Non-Hermitian avalanche effect: Non-perturbative effect induced by local non-Hermitian perturbation on a Z 2 topological order
    EPL (IF 1.958) Pub Date : 2020-08-23
    Cui-Xian Guo, Xiao-Ran Wang and Su-Peng Kou

    In this paper, based on a non-Hermitian toric-code model we found the fragileness of intrinsic topological orders under non-Hermitian perturbations. The effect of non-Hermitian avalanche for a designed toric-code model is uncovered: for the designed toric-code model with special external fields, a tiny non-Hermitian perturbation (local imaginary state-selective dissipation) leads to anomalous topological

    更新日期:2020-08-25
  • Cooperation emergence in group population with unequal competitions
    EPL (IF 1.958) Pub Date : 2020-08-23
    Chuang Deng, Lin Wang, Zhihai Rong and Xiaofan Wang

    Groups are the basic unit of organization in our society. It is important to investigate how groups compete and cooperation evolves in the population composed of groups. In this paper, based on the celebrated multi-player public goods game, we propose a general theoretical framework of the stochastic dynamic process to study how inequalities among groups affect the evolution of cooperation in a group

    更新日期:2020-08-25
  • Pauli Hamiltonian for a spin one-half particle carrying a non-Abelian charge in the presence of non-Abelian external fields
    EPL (IF 1.958) Pub Date : 2020-08-23
    Finagnon Anselme Dossa

    We study the solution of non-relativistic approximation of Dirac equation in the presence of non-Abelian external fields. The dynamics of the system is described by the Pauli Hamiltonian for a spin one-half particle carrying a non-Abelian charge. This non-Abelian charge, at the quantum level, is proportional to the generators of the U (2) gauge group and reveals the effect of a spin-orbit coupling

    更新日期:2020-08-25
  • Effects of Kerr medium on force sensing in a dissipative optomechanical system
    EPL (IF 1.958) Pub Date : 2020-08-23
    A. Mehmood, S. Qamar and S. Qamar

    In this paper, we study the effects of the Kerr medium on the detection of a weak classical force acting on an optomechanical oscillator which is coupled purely dissipatively. We find that force sensing better than the standard quantum limit (SQL) of the mechanical oscillator can be achieved in the presence of Kerr medium. We show that increasing the strength of Kerr nonlinearity not only improves

    更新日期:2020-08-25
  • Implementing fractional order Fourier transformation and confocal imaging with microwave computational metamaterials
    EPL (IF 1.958) Pub Date : 2020-08-23
    Zengyao Lv, Zhencheng Li, Wangdong Xu and Yongmao Pei

    Computational metamaterials, artificially structured materials, have enabled the realization of mathematical operations, such as spatial integration, differentiation, and convolution when waves propagate through them. However, experimental verifications and relevant applications of microwave computational metamaterials have rarely been achieved so far. In this paper, we present the theoretical and

    更新日期:2020-08-25
  • Characterization of a continuous phase transition in a chaotic system
    EPL (IF 1.958) Pub Date : 2020-08-23
    Edson D. Leonel, Makoto Yoshida and Juliano Antonio de Oliveira

    Some characteristics of scaling invariance are discussed for a transition from integrability to non-integrability in a class of dynamical systems described by a two-dimensional, nonlinear and area-preserving mapping. The dynamical variables are action I and angle θ and that the angle diverges in the limit of vanishingly action. The transition is controlled by a parameter ϵ closely related to the order

    更新日期:2020-08-25
  • Light-driven modulation of scalar order parameter for high spatial resolution
    EPL (IF 1.958) Pub Date : 2020-08-23
    Chiao-Ying Chien and Jun Yamamoto

    Improving the spatial resolution of the light-modulated scalar order parameter allows high-precision manipulation of functional molecules in the liquid crystals. This study shows that the poor resolution caused by the diffusion of azobenzene is overcome through the polymerization of an azobenzene monomer in the nematic phase. The photo-induced spatial variation of birefringence of non-polymerized and

    更新日期:2020-08-25
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