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Chinese Physics B

Resumen/Descripción – provisto por la editorial en inglés
Chinese Physics B covers the latest developments and achievements in all branches of physics. Articles, including papers and rapid communications, are those approved as creative contributions to the whole discipline of physics and of significance to their own fields.
Palabras clave – provistas por la editorial

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Historia

Continúa: Chinese Physics

Disponibilidad
Institución detectada Período Navegá Descargá Solicitá
No detectada desde ene. 2008 / hasta dic. 2023 IOPScience

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Tipo de recurso:

revistas

ISSN impreso

1674-1056

Editor responsable

Chinese Physical Society (CPS)

País de edición

China

Fecha de publicación

Cobertura temática

Tabla de contenidos

CCSD(T) study on the structures and chemical bonds of AnO molecules (An = Bk–Lr)*

Xiyuan Sun; Pengfei Yin; Kaiming Wang; Gang Jiang

<jats:p>The molecular geometries and dissociation energies of AnO (An = Bk–Lr) molecules were first obtained at the coupled-cluster single-, double-, and perturbative triple-excitations [CCSD(T)] level of theory. Four hybrid functionals, B3LYP, M06-2X, TPSSh, and PBE0, were also employed in the calculations for the sake of comparison. In comparison of the CCSD(T) results, B3LYP, TPSSh, and PBE0 functionals can obtain more appropriate results than M06-2X and MP2. The analyses on molecular orbitals show that the 7s, 6d, and 5f atomic orbitals of actinide (An) atoms participate in the bonding of An–O bonds. The partial covalent nature between An and O atoms is revealed by QTAIM analyses.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 033101

Effect of radiation on compressibility of hot dense sodium and iron plasma using improved screened hydrogenic model with l splitting

Amjad Ali; G Shabbir Naz; Rukhsana Kouser; Ghazala Tasneem; M Saleem Shahzad; Aman-ur-Rehman; M H Nasim

<jats:p>High pressure investigations of matter involve the study of strong shock wave dynamics within the materials which gives rise to many thermal effects leading to dissociation of molecules, ionization of atoms, and radiation emission, <jats:italic>etc</jats:italic>. The response of materials experiencing a strong shock can be determined by its shock Hugoniot calculations which are frequently applied in numerical and experimental studies in inertial confinement fusion, laboratory astrophysical plasma, <jats:italic>etc</jats:italic>. These studies involve high energy density plasmas in which the radiation plays an important role in determining the energy deposition and maximum compressibility achieved by the shock within material. In this study, we present an investigation for the effect of radiation pressure on the maximum compressibility of the material using shock Hugoniot calculations. In shock Hugoniot calculations, an equation of state (EOS) is developed in which electronic contributions for EOS calculations are taken from an improved screened hydrogenic model with –<jats:italic>l</jats:italic> splitting (I-SHML) [<jats:italic>High Energy Density Physics</jats:italic> (2018) <jats:bold>26</jats:bold> 48] under local thermodynamic equilibrium (LTE) conditions. The thermal ionic part calculations are adopted from the state of the art Cowan model while the cold ionic contributions are adopted from the scaled binding energy model. The Shock Hugoniot calculations are carried out for sodium and iron plasmas and our calculated results show excellent agreement with published results obtained by using either sophisticated self-consistent models or the first principle study.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 033102

Scheme to measure the expectation value of a physical quantity in weak coupling regime*

Jie Zhang; Chun-Wang Wu; Yi Xie; Wei Wu; Ping-Xing Chen

<jats:p>In quantum mechanics, the expectation value of an operator can be measured by using the projective measurement, if the coupling between the measured system and pointer is strong enough. However in the weak coupling regime, the pointer can not show all the eigenvalue of the physical quantity directly due to the overlapping among the pointer states, which makes the measurement of the expectation value difficult. In this paper, we propose an expectation value measurement method in the weak coupling regime inspired by the weak measurement scheme. Compared to the projective measurement, our scheme has two obvious advantages. Experimentally we use the internal state and motional state of a single trapped <jats:sup>40</jats:sup>Ca<jats:sup>+</jats:sup> to establish the measurement scheme and realize the proof of principle demonstration of the scheme.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 033201

Reflectionless spatial beam benders with arbitrary bending angle by introducing optic-null medium into transformation optics*

Fei Sun; Yi-Chao Liu; Yi-Biao Yang; Hong-Ming Fei; Zhi-Hui Chen; Sai-Ling He

<jats:p>By introducing an optic-null medium into the finite embedded transformation, a reflectionless spatial beam bender is designed, which can steer the output beam by a fixed pre-designed angle <jats:italic>β</jats:italic> for an arbitrary incident angle. The bending angle <jats:italic>β</jats:italic> of the beam bender is determined by the geometrical angle of the device, which can be changed by simply choosing different geometrical angles. For various bending angles, the designed spatial beam bender can be realized by the same materials (<jats:italic>i.e.</jats:italic>, an optic-null medium), which is a homogenous anisotropic material. Numerical simulations verify the reflectionless bending effect and rotated imaging ability of the proposed beam bender. A reduction model of the optic-null medium is studied, which can also be used for a reflectionless spatial beam bender with a pre-designed bending angle.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 034101

Design and verification of a broadband highly-efficient plasmonic circulator*

Jianfei Han; Shu Zhen; Weihua Wang; Kui Han; Haipeng Li; Lei Zhao; Xiaopeng Shen

<jats:p>Circulators play a significant role in radar and microwave communication systems. This paper proposes a broadband and highly efficient plasmonic circulator, which consists of spoof surface plasmon polaritons (SSPPs) waveguides and ferrite disks to support non-reciprocal mode coupling. The simulated performance of symmetrically designed circulator shows that it has an insertion loss of roughly 0.5 dB while the isolation and return loss is more than 12 dB in the frequency range of 6.0 GHz–10.0 GHz (relative bandwidth of 50%). Equivalent circuit model has been proposed to explain the operating mechanism of the plasmonic circulator. The equivalent circuit model, numerical simulations, and experimental results are consistent with each other, which demonstrates the good performance of the proposed plasmonic circulator.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 034102

Numerical simulation of super-continuum laser propagation in turbulent atmosphere*

Ya-Qian Li; Wen-Yue Zhu; Xian-Mei Qian

<jats:p>Considering the atmospheric extinction and turbulence effects, we investigate the propagation performances of super-continuum laser sources in atmospheric turbulence statistically by using the numerical simulation method, and the differences in propagation properties between the super-continuum (SC) laser and its pump laser are also analyzed. It is found that the propagation characteristics of super-continuum laser are almost similar to those of the pump laser. The degradation of source coherence degree may cause the relative beam spreading and scintillation indexes to decrease at different propagation distances or different turbulence strengths. The root-mean-square value of beam wandering is insensitive to the variation of source correlation length, and less aperture averaging occurs when the laser source becomes less coherent. Additionally, from the point of view of beam wandering, the SC laser has no advantage over the pump laser. Although the pump laser can bring about a bigger aperture average, the SC laser has a lower scintillation which may be due to the multiple wavelength homogenization effects on intensity fluctuations. This would be the most important virtue of the SC laser that can be utilized to improve the performance of laser engineering.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 034201

Modulation and enhancement of photonic spin Hall effect with graphene in broadband regions*

Peng Dong; Gaojun Wang; Jie Cheng

<jats:p>The photonic spin Hall effect (SHE) holds great potential applications in manipulating spin-polarized photons. However, the SHE is generally very weak, and previous studies of amplifying photonic SHE were limited to the incident light in a specific wavelength range. In this paper, we propose a four-layered nanostructure of prism-graphene-air-substrate, and the enhanced photonic SHE of reflected light in broadband range of 0 THz–500 THz is investigated theoretically. The spin shift can be dynamically modulated by adjusting the thickness of air gap, Fermi energy of graphene, and also the incident angle. By optimizing the structural parameter of this structure, the giant spin shift (almost equal to its upper limit, half of the incident beam waist) in broadband range is achieved, covering the terahertz, infrared, and visible range. The difference is that in the terahertz region, the Brewster angle corresponding to the giant spin shift is larger than that of infrared range and visible range. These findings provide us with a convenient and effective way to tune the photonic SHE, and may offer an opportunity for developing new tunable photonic devices in broadband range.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 034202

Modified scaling angular spectrum method for numerical simulation in long-distance propagation*

Xiao-Yi Chen; Ya-Xuan Duan; Bin-Bin Xiang; Ming Li; Zheng-Shang Da

<jats:p>The angular method (AS) cannot be used in long-distance propagation because it produces severe numerical errors due to the sampling problem in the transfer function. Two ways can solve this problem in AS for long-distance propagation. One is zero-padding to make sure that the calculation window is wide enough, but it leads to a huge calculation burden. The other is a method called band-limited angular spectrum (BLAS), in which the transfer function is truncated and results in that the calculation accuracy decreases as the propagation distance increases. In this paper, a new method called modified scaling angular spectrum (MSAS) to solve the problem for long-distance propagation is proposed. A scaling factor is introduced in MSAS so that the sampling interval of the input plane can be adjusted arbitrarily unlike AS whose sampling interval is restricted by the detector’s pixel size. The sampling interval of the input plane is larger than the detector’s pixel size so the size of calculation window suitable for long-distance field propagation in the input plane is smaller than the size of the calculation window required by the zero-padding. Therefore, the method reduces the calculation redundancy and improves the calculation speed. The results from simulations and experiments show that MSAS has a good signal-to-noise ratio (SNR), and the calculation accuracy of MSAS is better than BLAS.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 034203

Bidirectional highly-efficient quantum routing in a T-bulge-shaped waveguide*

Jia-Hao Zhang; Da-Yong He; Gang-Yin Luo; Bi-Dou Wang; Jin-Song Huang

<jats:p>Quantum routing in a T-bulge-shaped waveguide system coupled with a driven cyclic three-level atom and a two-level atom is investigated theoretically. By employing the discrete-coordinate scattering method, exact expressions of the transport coefficients along three ports of the waveguide channels are derived. Our results show that bidirectional high transfer-rate single-photon routing between two channels can be effectively implemented, with the help of the effective potential generated by two atoms and the external driving. Moreover, multiple band zero-transmission emerges in the scattering spectra, arising from the quantum interferences among photons scattered by the boundary and the bulged resonators. The proposed system may suggest an efficient duplex router with filtering functions.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 034204

Dissipative dynamics of an entangled three-qubit system via non-Hermitian Hamiltonian: Its correspondence with Markovian and non-Markovian regimes

M Rastegarzadeh; M K Tavassoly

<jats:p>We investigate an entangled three-qubit system in which only one of the qubits experiences the decoherence effect by considering a non-Hermitian Hamiltonian, while the other two qubits are isolated, i.e., do not interact with environment, directly. Then, the time evolution of the density matrix (for the pure as well as mixed initial density matrix) and the corresponding reduced density matrices are obtained, by which we are able to utilize the dissipative non-Hermitian Hamiltonian model with Markovian and non-Markovian regimes via adjusting the strange of the non-Hermitian term of the total Hamiltonian of the under-considered system.</jats:p>

Palabras clave: General Physics and Astronomy.

Pp. 034205