共查询到20条相似文献,搜索用时 31 毫秒
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Luke M. Butcher 《Physics letters. A》2019,383(9):843-849
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《Physics letters. A》2020,384(22):126431
Based on the first-principles calculations, we confirm the geometry and electronic structures of two binary group-VI compounds: monolayer α-Se2Te and α-SeTe2. The stabilities are confirmed by the cohesive energies, phonon dispersions, and elastic constants. The mechanical properties, strain-stress relationships, and strain-dependent variations of band gaps and band structures are investigated detailed. Furthermore, the high carrier mobilities (up to cm2 V−1 s−1) and optical absorption coefficients (several 105 cm−1) are also exhibited, demonstrating the great application potentials in optoelectronics. 相似文献
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《Physics letters. A》2020,384(36):126930
We consider quantum bosons with contact interactions at the Lowest Landau Level (LLL) of a two-dimensional isotropic harmonic trap. At linear order in the coupling parameter g, we construct a large, explicit family of quantum states with energies of the form , where and are integers. Any superposition of these states evolves periodically with a period of until, at much longer time scales of order , corrections to the energies of order may become relevant. These quantum states provide a counterpart to the known time-periodic behaviors of the corresponding classical (mean field) theory. 相似文献
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We propose two new type sine hyperbolic potentials and . They may become single- or double-well potentials depending on the potential parameters and k. We find that its exact solutions can be written as the confluent Heun functions , in which the energy level E is involved inside the parameter η. The properties of the wave functions, which is strongly relevant for the potential parameters and k, are illustrated. 相似文献
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Excited beryllium has been observed to decay into electron-positron pairs with a anomaly. The process is properly explained by a 17 MeV proto-phobic vector boson. In present work, we consider a family-nonuniversal that is populated by a gauge boson and a scalar field charged under and singlet under the Standard Model (SM) gauge symmetry. The SM chiral fermion and scalar fields are charged under and we provide them to satisfy the anomaly-free conditions. The Cabibbo-Kobayashi-Maskawa (CKM) matrix is reproduced correctly by higher-dimension Yukawa interactions facilitated by . The vector and axial-vector current couplings of the boson to the first generation of fermions do satisfy all the bounds from the various experimental data. The boson can have kinetic mixing with the hypercharge gauge boson and can directly couple to the SM-like Higgs field. The kinetic mixing of with the hypercharge gauge boson, as we show by a detailed analysis, generates the observed beryllium anomaly. We find that beryllium anomaly can be properly explained by a MeV-scale sector with a minimal new field content. The minimal model we construct forms a framework in which various anomalous SM decays can be discussed. 相似文献
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George Ruppeiner 《Physics letters. A》2019,383(8):703-706
Critical phenomena theory centers on the scaled thermodynamic potential per spin , with inverse temperature , , ordering field H, reduced temperature , critical exponents p and q, and function of . I discuss calculating with the information geometry of thermodynamics. Scaled solutions are found to obtain with three admissible functions : 1) , 2) , and 3) , where J and are constants. For , information geometry yields , consistent with the one-dimensional (1D) ferromagnetic Ising model. 相似文献
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《Physics letters. A》2020,384(13):126265
The exact solvability and impressive pedagogical implementation of the harmonic oscillator's creation and annihilation operators make it a problem of great physical relevance and the most fundamental one in quantum mechanics. So would be the position-dependent mass (PDM) oscillator for the PDM quantum mechanics. We, hereby, construct the PDM creation and annihilation operators for the PDM oscillator via two different approaches. First, via von Roos PDM Hamiltonian and show that the commutation relation between the PDM creation and annihilation operators, , not only offers a unique PDM-Hamiltonian but also suggests a PDM-deformation in the coordinate system. Next, we use a PDM point canonical transformation of the textbook constant mass harmonic oscillator analog and obtain yet another set of PDM creation and annihilation operators, hence an “apparently new” PDM-Hamiltonian is obtained. The “new” PDM-Hamiltonian turned out to be not only correlated with but also represents an alternative and most simplistic user-friendly PDM-Hamiltonian, ; , that has never been reported before. 相似文献
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《Current Applied Physics》2020,20(3):438-444
We fabricated the SnS/Ag/SnS (SAS) trilayer thin films by a sputtering method at 200 . The structural, optical, and electrical properties of the films were studied by varying the Ag interlayer thickness from 9 to 27 nm. The EDS analysis revealed that all SAS trilayer films showed an increase in the atomic percentage of Ag from 1.87 to 6.18. The X-ray diffraction studies confirmed that SAS films with Ag-18 nm thickness showed a preferred (111) peak of the SnS with improved crystallinity. The optical absorption coefficient of the SAS films increased by a factor of 18 when compared to the SnS films without Ag. Also, the optical band gap decreased from 1.53 to 1.28 eV with Ag thickness. All SAS films exhibited the p-type conductivity with increased hole-concentration from 1.94 to 4.15 cm−3 and also the mobility from 1.31 to 81.6 cm2. V−1s−1. 相似文献
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《Physics letters. A》2019,383(17):2114-2119
We provide a detailed analysis of a topological structure of a fermion spectrum in the Hofstadter model with different hopping integrals along the -links (), defined on a honeycomb lattice. We have shown that the chiral gapless edge modes are described in the framework of the generalized Kitaev chain formalism, which makes it possible to calculate the Hall conductance of subbands for different filling and an arbitrary magnetic flux ϕ. At half-filling the gap in the center of the fermion spectrum opens for , a quantum phase transition in the 2D-topological insulator state is realized at . The phase state is characterized by zero energy Majorana states localized at the boundaries. Taking into account the on-site Coulomb repulsion U (where ), the criterion for the stability of a topological insulator state is calculated at , . Thus, in the case of , the topological insulator state, which is determined by chiral gapless edge modes in the gap Δ, is destroyed. 相似文献
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In a recent paper, we theoretically investigated the density of states of the composite channel–contact system in the Coulomb and Kondo regimes using the self-consistent field approximation. There are the main experimental observations of vibration features in the Coulomb blockade [H. Park et al., Nature (London) 407, 57 (2000)] and Kondo [L. H. Yu et al., Phys. Rev. Lett. 93, 266802 (2004)] regimes. In the Kondo regime, our results show that one peak at can be observed in the density of states at low temperatures (0.0026 eV ≤ kBT ≤ 0.0000026 eV). Also, the real part of ∑3 has one minimum peak at and the real par of ∑2 has one maximum peak at for 0.01 ≤ μ ≤ 0.07 in the Kondo regime at low temperatures. 相似文献