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  • Observation of two 𝓟𝓣 transitions in an electric circuit with balanced gain and loss
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-08-04
    Tishuo Wang, Jianxiong Fang, Zhongyi Xie, Nenghao Dong, Yogesh N. Joglekar, Zixin Wang, Jiaming Li, Le Luo

    Abstract We investigate 𝓟𝓣-symmetry breaking transitions in a dimer comprising two LC oscillators, one with loss and the second with gain. The electric energy of this four-mode model oscillates between the two LC circuits, and between capacitive and inductive energy within each LC circuit. Its dynamics are described by a non-Hermitian, 𝓟𝓣-symmetric Hamiltonian with three different phases separated

    更新日期:2020-08-10
  • Probing electron dynamics by IR+XUV pulses
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-08-04
    P. -G. Reinhard, Éric Suraud

    Abstract By recording observables of electron emission we analyze the response of small metal clusters and organic molecules to a pump probe setup using an IR fs laser pulse as pump followed by an attosecond XUV pulse as probe. As tool for the study, we use Time Dependent Density Functional Theory (TDDFT) in real time complemented by a simple 2-level model for principle effects. As observables, we

    更新日期:2020-08-04
  • Testing gravity with cold-atom clocks in space
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-08-04
    Luigi Cacciapuoti, Michele Armano, Rudolf Much, Omar Sy, Achim Helm, Marc Peter Hess, Johannes Kehrer, Silvio Koller, Thomas Niedermaier, Francois Xavier Esnault, Didier Massonnet, Didier Goujon, Jacques Pittet, Pascal Rochat, Shuo Liu, Wolfgang Schaefer, Theo Schwall, Ivan Prochazka, Anja Schlicht, Ulrich Schreiber, Pacome Delva, Christine Guerlin, Philippe Laurent, Christophe le Poncin-Lafitte, Marc

    Abstract Atomic Clock Ensemble in Space (ACES) is a mission designed to test Einstein’s theory of General Relativity from the International Space Station (ISS). A primary frequency standard based on laser cooled caesium atoms (PHARAO) and an active H-maser (SHM) generate a clock signal that is distributed to a network of clocks on the ground to perform space-to-ground comparison. With a fractional

    更新日期:2020-08-04
  • Relativistic photoeffect for s states in a central field
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-08-04
    Evgenii Drukarev, Alexander Mikhailov, Khamdam Yu. Rakhimov, Hammid Yusupov

    Abstract We study the photoionization of the s states in the systems bound by sufficiently weak central fields V(r) for the large photon energies corresponding to the relativistic photoelectrons. We demonstrate that the energy dependence of the photoionization cross section can be obtained without solving the wave equation. We show that the shape of the energy dependence of the cross section is determined

    更新日期:2020-08-04
  • Electron emission in ionization of adenine molecule induced by 5 MeV/u bare C ions
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-08-04
    Shamik Bhattacharjee, Anuvab Mandal, Madhusree Roy Chowdhury, Chandan Bagdia, Juan M. Monti, Roberto D. Rivarola, Lokesh C. Tribedi

    Abstract The double differential cross sections (DDCS) of electron emission in ionization of adenine molecule (C5H5N5) induced by 5 MeV/u bare C ions are measured using the electron spectroscopy technique. Emission of electrons from adenine is measured in the energy range from 20 eV to 460 eV and in the angular range from 20° to 160°. The single differential cross sections (SDCS) and total ionization

    更新日期:2020-08-04
  • Simulating lattice gauge theories within quantum technologies
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-08-04
    Mari Carmen Bañuls, Rainer Blatt, Jacopo Catani, Alessio Celi, Juan Ignacio Cirac, Marcello Dalmonte, Leonardo Fallani, Karl Jansen, Maciej Lewenstein, Simone Montangero, Christine A. Muschik, Benni Reznik, Enrique Rico, Luca Tagliacozzo, Karel Van Acoleyen, Frank Verstraete, Uwe-Jens Wiese, Matthew Wingate, Jakub Zakrzewski, Peter Zoller

    Abstract Lattice gauge theories, which originated from particle physics in the context of Quantum Chromodynamics (QCD), provide an important intellectual stimulus to further develop quantum information technologies. While one long-term goal is the reliable quantum simulation of currently intractable aspects of QCD itself, lattice gauge theories also play an important role in condensed matter physics

    更新日期:2020-08-04
  • Erratum to: The formation mechanism of aqueous hydrogen peroxide in a plasma-liquid system with liquid as the anode
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-23
    Jiao Lin, Xinyi He, Qiang Chen, Qing Xiong, Junshuai Li, Xin Wang, Guolong Chen, Qing Huo Liu, Kostya (Ken) Ostrikov

    We find that we made a mistake in the estimation of the H2O2 concentration by the colorimetric method in our previous paper (J. Lin et al., Eur. Phys. J. D (2020) 74: 80) [1].

    更新日期:2020-07-29
  • Recent studies with electrons, positrons and positronium
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-23
    Michael J. Brunger, David B. Cassidy, Saša Dujko, Dragana Marić, Joan Marler, James P. Sullivan, Juraj Fedor

    The latest rendition of the POSMOL conference, being comprised of the 20th International Workshop on Low-energy Positron and Positronium Physics and the 21st International Symposium on Electron–Molecule Collisions and Swarms, was successfully held at the Serbian Academy of Arts and Sciences, Belgrade, from July 18th to 20th 2019. Immediately thereafter, a one day workshop in honour of Professor Zoran

    更新日期:2020-07-25
  • Thermodynamic properties of Aharanov–Bohm (AB) and magnetic fields with screened Kratzer potential
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-23
    Akpan N. Ikot, Collins O. Edet, Precious O. Amadi, Uduakobong S. Okorie, Gaotsiwe J. Rampho, Hewa Y. Abdullah

    Abstract In this study, the Schrödinger equation (SE) with screened Kratzer potential (SKP) in the presence of external magnetic and AB-flux fields is investigated using the factorization method. The eigenvalue and eigenfunction for the system are obtained in closed form. It is found that the presence of the magnetic field partially removes the degeneracy when the screening parameter of the potential

    更新日期:2020-07-25
  • Frozen-planet resonances in doubly excited helium atom; adiabatic approach
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-23
    Tasko P. Grozdanov, Alexander A. Gusev, Evgeni A. Solov’ev, Sergue I. Vinitsky

    Abstract An improved adiabatic method is applied to study the highly excited asymmetric two-electron configurations of helium atom known as frozen-planet resonances. It is shown that our approach provides much better agreement with numerically calculated resonance positions than the previously used Born–Oppenheimer type approximation. Wide range of states were studied, related to N = 7 − 15 first-ionization

    更新日期:2020-07-25
  • Polarization in the production of the antihydrogen ion
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-23
    Casey A. Yazejian, Jack C. Straton

    Abstract We provide estimates of both the cross section and rate coefficient for the radiative attachment of a second positron to create the H̅+ ion, H̅(1s)+e+→H̅+(1s2 1Se)+ℏω, for which the polarization of the initial state H̅(1s) is taken into account. We show how to analytically integrate the resulting six-dimensional, three-body integrals for wave functions composed of explicitly correlated exponentials

    更新日期:2020-07-25
  • Electron emission in fast heavy ion impact ionization of C 60 and Ne: giant plasmon excitation
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-23
    A. H. Kelkar, D. Misra, L. Gulyás, Lokesh C. Tribedi

    Abstract We have measured the energy and angle differential ejected electron spectra of C60 as well as Ne atoms in collisions with 4 MeV/u bare fluorine projectile ions. Absolute cross sections have been estimated for electron emission in the energy range of 1 eV–300 eV, including the KLL-Auger electrons for various angles between 30° and 150°. The double differential cross sections for C60 have been

    更新日期:2020-07-25
  • The role of spin–orbit effects in the mobility of N + ions moving in a helium gas at low temperature
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-23
    Lamia Aïssaoui, Peter J. Knowles, Moncef Bouledroua

    Abstract The mobility of N+ ions in ground-state helium gas at very low temperature is examined with explicit inclusion of spin–orbit coupling effects. The ionic kinetics is treated theoretically with the three-temperature model. The N+–He interaction potentials, including spin–orbit coupling, are determined using high-level ab initio calculations. Then, the classical and quantal transport cross sections

    更新日期:2020-07-23
  • A quantum secret sharing scheme with verifiable function
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-16
    Li-Juan Liu, Zhi-Hui Li, Zhao-Wei Han, Dan-Li Zhi

    Abstract In the (t, n) threshold quantum secret sharing scheme, it is difficult to ensure that internal participants are honest. In this paper, a verifiable (t, n) threshold quantum secret sharing scheme is designed to combine with classical secret sharing scheme. First of all, the distributor uses the asymmetric binary polynomial to generate the shares and sends them to each participant. Secondly

    更新日期:2020-07-17
  • Teleportation with superconducting qubits
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-07
    Soheila Salimian, Mohammad Kazem Tavassoly, Nayere Sehati

    Abstract In this paper we propose a new protocol for quantum teleportation between two LC resonators in Alice’s and Bob’s lab via superconducting qubits. The coupling of superconducting qubits with each other and with LC resonators are tunable by applying the external magnetic fields. We use this model to generate entanglement between superconducting qubits and teleport the unknown state of LC resonator

    更新日期:2020-07-07
  • Concepts for direct frequency-comb spectroscopy of 229m Th and an internal-conversion-based solid-state nuclear clock
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-07
    Lars von der Wense, Chuankun Zhang

    Abstract A new concept for narrow-band direct nuclear laser spectroscopy of 229mTh is proposed, using a single comb mode of a vacuum ultraviolet frequency comb generated from the 7th harmonic of an Yb-doped fiber laser system. In this concept more than 1013 229Th atoms on a surface are irradiated in parallel and a successful nuclear excitation is probed via the internal-conversion (IC) decay channel

    更新日期:2020-07-07
  • Periodic driving induced helical Floquet channels with ultracold atoms in momentum space
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-07
    Teng Xiao, Dizhou Xie, Wei Gou, Tao Chen, Tian-Shu Deng, Wei Yi, Bo Yan

    Abstract Employing the external degrees of freedom of atoms as synthetic dimensions renders easy and new accesses to quantum engineering and quantum simulation. As a recent development, ultracold atoms suffering from two-photon Bragg transitions can be diffracted into a series of discrete momentum states to form a momentum lattice. Here we provide a detailed analysis on such a system, and, as a concrete

    更新日期:2020-07-07
  • The gravity estimation with square-root unscented Kalman filter in the cold atom gravimeter
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-07
    Liuqing Zhang, Yin Zhou, Kanxing Weng, Bing Cheng, Bin Wu, Qiang Lin, Zhenghui Hu

    Abstract In the atomic gravimeter, the interference fringe is obtained by scanning the chirp rate of the Raman lasers to compensate for the gravity induced Doppler frequency shift and then the gravitational acceleration can be obtained by extracting the phase of the atomic interference fringe. The phase of the interference fringe is proportional to the chirp rate, therefore the accurate estimation

    更新日期:2020-07-07
  • On the electronic structure of methyl butyrate and methyl valerate
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-07
    Małgorzata A. Śmiałek, Denis Duflot, Nykola C. Jones, Søren Vrønning Hoffmann, Lucia Zuin, Michael Macdonald, Nigel J. Mason, Paulo Limão-Vieira

    Abstract We present novel results of the analysis of the electronic structure of two aliphatic esters: methyl butyrate and methyl valerate. High-resolution photoabsorption spectra were collected and analyzed over the energy range 4.0–10.8 eV and showed for both the molecules not only a clear band of the HOMO to LUMO transition, but also vibronic structure associated with the first Rydberg-valence transition

    更新日期:2020-07-07
  • Quantum test of the Universality of Free Fall using rubidium and potassium
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-07
    Henning Albers, Alexander Herbst, Logan L. Richardson, Hendrik Heine, Dipankar Nath, Jonas Hartwig, Christian Schubert, Christian Vogt, Marian Woltmann, Claus Lämmerzahl, Sven Herrmann, Wolfgang Ertmer, Ernst M. Rasel, Dennis Schlippert

    Abstract We report on an improved test of the Universality of Free Fall using a rubidium-potassium dual-species matter wave interferometer. We describe our apparatus and detail challenges and solutions relevant when operating a potassium interferometer, as well as systematic effects affecting our measurement. Our determination of the Eötvös ratio yields ηRb,K = −1.9 × 10−7 with a combined standard

    更新日期:2020-07-07
  • Radiative cooling of carbon cluster anions C 2n+1 − ( n = 3–5)
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-07
    Mark H. Stockett, James N. Bull, Jack T. Buntine, Eduardo Carrascosa, Emma K. Anderson, Michael Gatchell, Magdalena Kaminska, Rodrigo F. Nascimento, Henrik Cederquist, Henning T. Schmidt, Henning Zettergren

    Abstract Radiative cooling of carbon cluster anions C2n+1− (n = 3–5) is investigated using the cryogenic electrostatic ion storage ring DESIREE. Two different strategies are applied to infer infrared emission on slow (milliseconds to seconds) and ultraslow (seconds to minutes) timescales. Initial cooling of the ions over the millisecond timescale is probed indirectly by monitoring the decay in the

    更新日期:2020-07-07
  • Sputtering of LiF and other halide crystals in the electronic energy loss regime
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-07
    Marcel Toulemonde, Walter Assmann, Brigitte Ban-d’Etat, Markus Bender, Andreas Bergmaier, Philippe Boduch, Serge Della Negra, Jinglai Duan, Aymann S. El-Said, Florian Grüner, Jie Liu, Daniel Lelièvre, Hermann Rothard, Tim Seidl, Daniel Severin, Jean Paul Stoquert, Kay-Obe Voss, Christina Trautmann

    Abstract Sputtering experiments were performed by irradiating LiF, NaCl, and RbCl crystals with various swift heavy ions like S, Ni, I, Au with energies between 60 and 210 MeV, C60 clusters between 12 and 30 MeV or Pb ions between 730 and 6040 MeV. Sputtered species are collected on arc-shaped catchers and subsequently analyzed by elastic recoil detection analysis or Rutherford backscattering analysis

    更新日期:2020-07-07
  • Multi-mode plasma resonator based on multi metal-coated nanorods
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-07
    Xiaomeng Zhang, Guanxia Yu, Ruoyu Cao, Yihang Lv

    Abstract The surface plasmon resonance and strong coupling of three layers of metal-coated nanorods are studied in this paper. Numerical results show that an incident electromagnetic wave with a particular frequency can be guided through localized surface plasma resonances to different-sized cavities, realizing excellent absorbance of electromagnetic waves. The refractive index of the surrounding medium

    更新日期:2020-07-07
  • Disembodiment of arbitrary number of properties in quantum Cheshire cat experiment
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-07
    Alok Kumar Pan

    Abstract The quantum Cheshire cat is an effect demonstrated within the framework of weak measurement aided with post-selection scenario where the property (say, grin) of a quantum particle (the cat) can be found in a spatially separated location from its position. In this work, we first propose interesting variants of quantum Cheshire cat where disembodiment of two different properties of a "cat" is

    更新日期:2020-07-07
  • The dependence of the time delay on the shape of the wave packet tunneling through the potential barrier
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-04
    Andrey A. Bocharov

    Abstract The problem of quasi-monochromatic wave packet tunneling through a potential rectangular barrier is studied. It is shown that the approach to calculating the time delay of a wave packet called ``phase time’’ is not universally correct though well known in the literature. In this paper we discuss the mathematical reasons for this discrepancy, and substantiate another, more correct analytical

    更新日期:2020-07-02
  • Enhanced electron acceleration by a chirped tightly focused laser in vacuum in the presence of axial magnetic field
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-02
    Niti Kant, Jyoti Rajput, Arvinder Singh

    Abstract The paper presents a scheme of vacuum electron acceleration due to tightly focused linearly polarized (LP) frequency chirped laser in the presence external magnetic field. The focused terawatt chirped laser pulse and the external axial magnetic field enable the electron of few MeV initial energy to attain high energy in GeV range, hence, explore the possibility of efficient electron acceleration

    更新日期:2020-07-02
  • Pulse duration dependence of harmonic yield of H 2 + and its isotopic molecule
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-01
    Cuiyan Xu, Liqiang Feng, Yan Qiao, Yi Li

    Abstract We investigate the pulse duration dependence of harmonic yield in isotopic molecules of H2+ and T2+ driven by different laser intensities. Generally, the harmonic yield can be improved as pulse duration increases and then a maximum value can be obtained at the specific duration. Particularly, (i) driven by low laser intensity, the optimal pulse duration for H2+ is 20 cycles, and the harmonic

    更新日期:2020-06-29
  • Supersolid phase of cold atoms
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-01
    Tie-Fu Zhang, Wei Han, Ren-Yuan Liao, Jin-Wu Ye, Wu-Ming Liu

    Abstract Supersolid phase is a phase of matter that is characterized by the combination of the off-diagonal long-range order of superfluid and the diagonal long-range order of solid. Cold atoms with spin–orbit-coupling, contact interaction and long-range interaction can provide systems for the research of supersolid phase. Under the effect of spin-dependent potential and spin–orbit-coupling, hard-core

    更新日期:2020-06-29
  • Elastic-electron-scattering from 1,2-ethylenediamine and dimethyldiazene
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-01
    Murilo O. Silva, Sergio d’A. Sanchez, Márcio H. F. Bettega

    Abstract We present elastic integral, differential and momentum transfer cross sections for scattering of electrons by 1,2-ethylenediamine (NH2C2H4NH2) and by dimethyldiazene (CH3N2CH3). The cross sections were computed with the Schwinger multichannel method implemented with norm-conserving pseudopotentials. The calculations were carried out in the static-exchange and static-exchange plus polarization

    更新日期:2020-06-29
  • Enhancement of transmission in 1D thermal tunable metallic photonic crystal filter with exponential gradation thickness
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-01
    Zeinab Zare, Abdolrasoul Gharaati

    Abstract Using the transfer matrix method, the transmission of 1D thermal tunable metallic photonic crystal (PC) filter with symmetry exponential gradation of thickness has been examined in this article. For the purpose of making this structure, three different materials silicon, silica, and silver have been used. The refractive index of silver is considered as a function of temperature and wavelength

    更新日期:2020-06-29
  • Exact and approximated solutions for the harmonic and anharmonic repulsive oscillators: Matrix method
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-01
    Braulio M. Villegas-Martínez, Héctor Manuel Moya-Cessa, Francisco Soto-Eguibar

    Abstract We study the repulsive harmonic oscillator and an extension of this system, with an additional linear anharmonicity term. The system is solved in exact and perturbative form, the latter by using the so-called normalized perturbative matrix method. The perturbative solution up to second order is compared with the exact solution when the system is initially in coherent and a Schrödinger-cat

    更新日期:2020-06-29
  • Understanding asymmetry in electromagnetically induced transparency for 87 Rb in strong transverse magnetic field
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-07-01
    Indra Hang Subba, Ranjit Kumar Singh, Nayan Sharma, Souvik Chatterjee, Ajay Tripathi

    Abstract We present the results of our experimental investigation performed for D2 line of 87Rb. In this work, we have studied the phenomenon of electromagnetically induced transparency of 87Rb in presence of a transverse magnetic field and it is interesting to find the EIT spectrum shows signature of the closely lying hyperfine excited states in particular F′ = 1. We choose two different configurations

    更新日期:2020-06-29
  • Dissociation of NH 3 2+ induced by collision of 300 eV electrons with NH 3
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-25
    Long Wei, Shanbin Chen, Yu Zhang, Bo Wang, Wandong Yu, Baihui Ren, Jie Han, Yaming Zou, Li Chen, Baoren Wei

    Abstract The dissociation of ammonia dications induced by 300 eV electron impact has been studied using a cold target recoil-ion momentum spectroscopy. Three regimes were found in the evolution of the produced NH32+ ions, i.e. stable (long-lived), slowly dissociating (metastable), and promptly dissociating. Multiple dissociation channels of NH32+ have been distinguished and identified by ion–ion coincidence

    更新日期:2020-06-26
  • Electrostatic guiding of the methylidyne radical at cryogenic temperatures
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-25
    David M. Lancaster, Cameron H. Allen, Kylan Jersey, Thomas A. Lancaster, Gage Shaw, Mckenzie J. Taylor, Di Xiao, Jonathan D. Weinstein

    Abstract We have produced a cryogenic buffer-gas cooled beam of the diatomic molecular radical CH (methylidyne). This molecule is of interest for studying cold chemical reactions and fundamental physics measurements. Its light mass and ground-state structure make it a promising candidate for electrostatic guiding and Stark deceleration, which allows for control over its kinetic energy. This control

    更新日期:2020-06-26
  • Photodissociation of mono- and di-anionic tin clusters
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-25
    Markus Wolfram, Steffi Bandelow, Alexander Jankowski, Stephan König, Gerrit Marx, Lutz Schweikhard

    Abstract Negatively charged tin clusters offer a broad range of decay products, as observed after electron-cluster interactions [S. König, M. Wolfram, S. Bandelow, G. Marx, L. Schweikhard, Eur. Phys. J. D 72, 153 (2018)]. To get further insight into their decay pathways, size and charge-state selected clusters Snn- and Snn2- were photo-excited at the ClusterTrap setup by 532 nm Nd:YAG laser pulses

    更新日期:2020-06-26
  • Photodetachment in cold ion traps
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-25
    Barry P. Mant, Markus Nötzold, Lola González-Sánchez, Roland Wester, Franco A. Gianturco

    Abstract We present a computational investigation of the photodetachment (PD) dynamics of C2H− in its ground, electronic 1Σ state, cooled in an ion trap with He as a buffer gas. Our analysis employs a range of PD rates from quantum dynamics, selective choices of the anion’s initial rotational state populations as the laser is switched on, and different operational trap conditions. Our results show

    更新日期:2020-06-26
  • The effect of negative ion population on dust acoustic wave propagation in a self gravitating Lorentzian dusty plasma
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-23
    Samit Paul, Raicharan Denra, Susmita Sarkar

    Abstract A theoretical investigation into the effect of negative ion population on dust acoustic wave propagation is presented in a self-gravitating dusty plasma consisting of electrons, negative ions, positive ions, and charged dust grains. The kappa distributed suprathermal electrons and Maxwellian ions are assumed. The inertial dust grain is assumed to have a variable charge which is negative or

    更新日期:2020-06-23
  • Dust-induced instability with dust charge fluctuations in a rotating dusty plasma
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-23
    Xiao-Song Yang, Bing Wang, Hui Chen, Xiao-Chang Chen, San-Qiu Liu

    Abstract The dust-induced instability involving charge fluctuations is studied in rotating dusty plasma. Due to dust charging dynamics, the dust-induced instability mode which was first put forward by Mikhailovskii et al. [A.B. Mikhailovskii, S.V. Vladimirov, J.G. Lominadze, V.S. Tsypin, A.P. Churikov, N.N. Erokhin, R.M.O. Galvao, Phys. Plasmas 15, 014504 (2008)] will be replaced by dust-charging-rotational

    更新日期:2020-06-23
  • Generating non-locality correlation via 2-photon resonant interaction of dissipative two-qubit system with coherent field
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-23
    Abdel-Baset A. Mohamed, Mostafa Hashem, Moataz M. Elkhateeb, Abdel-Shafy F. Obada

    Abstract In this paper, we introduce analytically the TC-model of two qubits interacting with a coherent cavity field via 2-photon process under the intrinsic dissipation effect. The interaction between the coherent cavity field and the two qubits, which are initially in an uncorrelated state, leads to generate non-locality qubit-qubit correlations. These correlations are investigated by using trace-norm

    更新日期:2020-06-23
  • Effective triangular ladders with staggered flux from spin-orbit coupling in 1D optical lattices
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-16
    Josep Cabedo, Joan Claramunt, Jordi Mompart, Verònica Ahufinger, Alessio Celi

    Abstract Light-induced spin-orbit coupling is a flexible tool to study quantum magnetism with ultracold atoms. In this work we show that spin-orbit coupled Bose gases in a one-dimensional optical lattice can be mapped into a two-leg triangular ladder with staggered flux following a lowest-band truncation of the Hamiltonian. The effective flux and the ratio of the tunneling strengths can be independently

    更新日期:2020-06-23
  • Sublimation of Li@C 60
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-16
    Eleanor E. B. Campbell, Henry J. Chandler, Renald Schaub

    Abstract Experiments that probe the fundamental properties of endohedral fullerenes often require the preparation of molecular beams or thin films of the neutral molecules. It is challenging to cleanly sublime this class of molecules without producing some thermal degradation. We report combined gas phase and scanning tunnelling microscopy studies that probe the thermal decay of commercial [Li+C60]PF6-

    更新日期:2020-06-23
  • Influence of Schottky metal-semiconductor contact on the responsivity of UV photodetectors with internal gain
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-16
    Xuan Zhou, Dayong Jiang, Man Zhao, Yuhan Duan, Nan Wang, Chuncai Shan, Qian Li, Meng Li, Xiaomiao Fei, Xinjing Zhao

    Abstract Metal-semiconductor-metal (MSM) ultraviolet photodetector is fabricated on ZnO films, prepared by radio frequency magnetron sputtering technique on quartz substrates. The ZnO photodetector shows low dark current and external quantum efficiency (EQE) due to the gain effect. The device also exhibits a near linear responsivity dependence on voltage, which gradually rise to the peak first, then

    更新日期:2020-06-23
  • Floquet higher-order exceptional points and dynamics in PT-symmetric quadrimer waveguides
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-16
    Jun Jia, Bo Zhu, Fuqiu Ye, Honghua Zhong, Haiming Deng

    Abstract We investigate the effect of periodic modulation on PT-symmetry recovery, higher-order exceptional points (EPs) and dynamics for a periodically modulated PT-symmetric quadrimer waveguide system. It is analytically and numerically revealed that the periodic modulation not only can restore the broken PT symmetry, but also can manipulate the PT symmetry by tuning modulation amplitude. Furthermore

    更新日期:2020-06-23
  • Optimizing the optical absorption coefficient of a core/shell quantum dot near a bimetallic nanoparticle
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-16
    Naser Zamani, Alireza Keshavarz, Hamid Nadgaran

    Abstract In this paper, the optical absorption coefficient of a core/shell quantum dot near a bimetallic nanoparticle is maximized. For this purpose, the Schrödinger equation is solved by numerical methods to obtain the exciton energy. Then by using the density matrix method, the absorption coefficient of the hybrid system is calculated. Afterward, by applying the particle swarm optimization (PSO)

    更新日期:2020-06-23
  • Pressure-induced phase transition of 1,4-dioxane: From twisted-boat- to chair conformer
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-16
    Yixin Chen, Aijun Li, Yue Zhao, Jingkai Bi, Mengying Zheng, Mi Zhou, Hongbo Wang

    Abstract 1,4-dioxane presents promising application in the field of organic synthesis. To discover the structural and phase information of 1,4-dioxane under pressure, in-situ high-pressure Raman measurement of 1,4-dioxane is carried out up to 15 GPa. At around 0.5 GPa, 1,4-dioxane undergoes a liquid–solid phase transition from liquid phase to a new high-pressure phase I. The evolution of Raman spectra

    更新日期:2020-06-23
  • A quantum chemical study of endometallofullerenes: Gd@C 70 , Gd@C 82 , Gd@C 84 , and Gd@C 90
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-16
    Anna V. Zakharova, Marina E. Bedrina

    Abstract Quantum chemical (U)PBE0 method is used to investigate the endometallofullerenes Gd@C70, Gd@C82, Gd@C84, and Gd@C90 for different spin states. The equilibrium structural parameters, IR spectra, the chemical bond energies, the electron affinity and vertical ionization potentials are calculated. The analysis of the electron and spin populations of the atomic orbitals in gadolinium endocomplexes

    更新日期:2020-06-23
  • Tunable fast to slow light and second-order sideband generation in an optomechanical system with phonon pump
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-16
    Hua-Jun Chen

    Abstract We theoretically demonstrate optomechanically induced transparency (OMIT) and its related coherent optical propagation properties such as fast and slow light effects in a cavity optomechanical system driven by a weak coherent phonon pump for suitable parametric and detuning regimes. The probe transmission spectrum experiences different processes under different detuning regimes, and the numerical

    更新日期:2020-06-23
  • Decoherence of multipartite entanglement states under amplitude-damping environment in non-inertial frames
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-16
    Kwang-Il Kim, Myong Chol Pak, Tae-Hyok Kim

    Abstract In this paper, we investigate the decoherence of two-qubit state under amplitude-damping channel in non-inertial frames and find some results differ from those of previous study. In case of only Bob’s qubit undergoing decoherence, the entanglement sudden death (ESD) does not appear for any acceleration parameter. By using three-tangle τ we also investigate decoherence of GHZ state under amplitude-damping

    更新日期:2020-06-23
  • Quantum sensing with milligram scale optomechanical systems
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-18
    Yuta Michimura, Kentaro Komori

    Abstract Probing the boundary between classical and quantum mechanics has been one of the central themes in modern physics. Recently, experiments to precisely measure the force acting on milligram scale oscillators with optical cavities are attracting interest as promising tools to test quantum mechanics, decoherence mechanisms, and gravitational physics. In this paper, we review the present status

    更新日期:2020-06-16
  • Photoelectron holography of the H 2 + molecule
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-18
    Gellért Zsolt Kiss, Sándor Borbély, Attila Tóth, Ladislau Nagy

    Abstract We investigate the photoelectron spectrum of the H2+ target induced by few-cycle XUV laser pulses using first principle calculations. In the photoelectron spectrum, by performing calculations for different internuclear separations, we investigate how the structure of the target is influencing the spatial interference pattern. This interference pattern is created by the coherent superposition

    更新日期:2020-06-16
  • Quantum Fisher information affected by fluctuating vacuum electromagnetic field with a boundary
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-18
    Zhiming Huang, Zhimin He

    Abstract We study the behaviors of quantum Fisher information (QFI) for an accelerated atom interacted with fluctuating electromagnetic vacuum near a perfectly reflecting boundary. The master equation that governs the atom evolution is firstly derived. In the case without boundary, the fluctuation and acceleration of electromagnetic vacuum always attenuate the QFI. Nevertheless, in the presence of

    更新日期:2020-06-16
  • The role of the Debye screening of circular Rydberg states of hydrogenic systems in collinear electric and magnetic fields of arbitrary strengths
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-18
    Nikolay Kryukov, Eugene Oks

    Abstract We consider classical circular Rydberg states of a hydrogenic atom/ion under collinear electric and magnetic fields of arbitrary strengths, the entire system being immersed into a plasma with the Debye screening. In this way we add a “new dimension” to the results of the previous paper of one of us, where the screening was not taken into account. We show in detail how the screening decreases

    更新日期:2020-06-16
  • Numerical investigation of the effect of variation of gas mixture ratio on density distribution of etchant species (Br, Br + , Cl, Cl + , and H) in HBr/Cl 2 /Ar plasma discharge
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-11
    Muhammad Majeed, Banat Gul, Gulfam Zia, Aman-ur-Rehman

    Abstract A self-sustained fluid model is used to study the effect of variation of noble gas fraction (Ar) and variation of gas mixture ratio (HBr/Cl2/Ar) on density distribution of important etchant species (Br, Br+, Cl, Cl+, and H) in HBr/Cl2/Ar capacitive coupled plasma discharge that is being vastly used for dry etching of Si, GaAs, GaSb and other group III and IV semiconductor materials. A comprehensive

    更新日期:2020-06-10
  • Atomic hydrogen interactions with small polycyclic aromatic hydrocarbons cations
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-11
    Thomas Schlathölter, Yahia Mostafa, Amber Kamman, Arnold Dongelmans, Yann Arribard, Stephanie Cazaux, Ronnie Hoekstra

    Abstract When exposed to a thermal beam of hydrogen atoms, gas-phase coronene cations C24H12+ can be sequentially hydrogenated. This process is accompanied by a gradual transition of the electronic structure from aromatic to aliphatic. The planar very stable coronene structure transforms into the significantly weaker corrugated structure, typical for aliphatic molecules. In this study, we have investigated

    更新日期:2020-06-10
  • A network of superconducting gravimeters as a detector of matter with feeble nongravitational coupling
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-11
    Wenxiang Hu, Matthew M. Lawson, Dmitry Budker, Nataniel L. Figueroa, Derek F. Jackson Kimball, Allen P. Mills, Christian Voigt

    Abstract Hidden matter that interacts only gravitationally would oscillate at characteristic frequencies when trapped inside of Earth. For small oscillations near the center of the Earth, these frequencies are around 300 μHz. Additionally, signatures at higher harmonics would appear because of the non-uniformity of Earth’s density. In this work, we use data from a global network of gravimeters of the

    更新日期:2020-06-10
  • Electron and positron scattering by atomic beryllium
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-09
    David D. Reid, J. M. Wadehra

    Abstract We present calculations of cross sections for electron- and positron-scattering from atomic beryllium over a wide range of incident energies from the first inelastic thresholds to 5000 eV. We use model potentials that have been shown to be reliable over a wide energy range in previous studies. The present work includes the total, integrated elastic, momentum transfer, and differential cross

    更新日期:2020-06-09
  • Structural evolution of free-standing 2D silicon carbide upon heating
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-09
    Tue Minh Le Nguyen, Vo Van Hoang, Hang T. T. Nguyen

    Abstract Two-dimensional Silicon Carbide (2D SiC) model is studied via molecular dynamics simulation to observe the structural evolution upon heating. A model contains 11040 atoms interacting via Vashishta potentials. The model is heated up from 50 K to 4500 K in order to observe the changes in structures during heating process. The melting point of free-standing 2D SiC is defined to be around 4050

    更新日期:2020-06-09
  • Superhalogens in fluoride diruthenium Ru 2 F n ( n = 1–10): density functional theory
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-09
    Xuefeng Wang, Jun Yan, Wenqian Chen, Xuanyan Zou, Xiaohong Chen

    Abstract The structures of the lowest and a few higher isomers for Ru2Fn (n = 1–10) clusters are obtained based on functional B3P86 with 6–311 + g(d) for fluorine and LANL2DZ for ruthenium. The results show that Ru2Fn (n = 5–10) clusters investigated represent superhalongens characterized by the vertical electron affinity energies (VEA) significantly exceeding 3.8 eV. The VEA values estimated for the

    更新日期:2020-06-09
  • Wigner scattering theory for systems held together by Coulombic forces
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-09
    Jean-Patrick Connerade

    Abstract The relevance of Wigner Scattering theory and in particular of its K-matrix formulation is stressed for all systems held together by Coulombic forces including not only atoms and molecules but also clusters. Originally developed and formulated for nuclear scattering, Wigner’s theory is extremely general, with application in many branches of physics. Atomic Physics often makes use of an apparently

    更新日期:2020-06-09
  • Structures, stabilities and electronic properties of the bimetal V 2 -doped Si n ( n = 1–10) clusters: a density functional investigation
    Eur. Phys. J. D (IF 1.366) Pub Date : 2020-06-09
    Chenggang Li, Weiguang Chen, Yingqi Cui, Wenjing Li, Guolei Li, Yu Ma, Hongfei Li, Baozeng Ren, Yanfei Hu

    Abstract Structures, stabilities and electronic properties of mixed silicon/vanadium clusters (V2Sin; n = 1–10) have been investigated systematically using the CALYPSO structural searching approach and density functional theory calculations. Results indicate two vanadium atoms tend to form V2 bond encapsulated gradually into silicon cages with the increasing number of silicon atoms. Analyses of stabilities

    更新日期:2020-06-09
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