Frontiers of Physics

ISSN 2095-0462

ISSN 2095-0470(Online)

CN 11-5994/O4

邮发代号 80-965

2018 Impact Factor: 2.483



2019年, 第14卷 第6期 出版日期:2019-12-15

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12 superconducting qubits for quantum walks
Heng Fan, Xiaobo Zhu
Frontiers of Physics. 2019, 14 (6): 61201-.

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Topological quantum walks: Theory and experiments
Jizhou Wu, Wei-Wei Zhang, Barry C. Sanders
Frontiers of Physics. 2019, 14 (6): 61301-.

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Probing intensity-field correlations of single-molecule surface-enhanced Raman-scattered light
O. de los Santos-Sánchez
Frontiers of Physics. 2019, 14 (6): 61601-.

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In the context of the quantum-mechanical description of single-molecule surface-enhanced Raman scattering, intensity-field correlation measurements of photons emitted from a plasmonic cavity are explored, theoretically, using the technique of conditional homodyne detection. The inelastic interplay between plasmons and vibrations of a diatomic molecule placed inside the cavity can be manifested in phase-dependent third-order fluctuations of the light recorded by the aforesaid technique, allowing us to reveal signatures of non-classicality (indicatives of squeezing) of the outgoing Raman photons.

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A collection of 505 papers on false or unconfirmed ferroelectric properties in single crystals, ceramics and polymers
Zbigniew Tylczyński
Frontiers of Physics. 2019, 14 (6): 63301-.

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This collection presents 505 papers on ferroelectricity in single crystals, ceramics and polymers in which pointed or elliptical hysteresis loops would testify to their ferroelectric properties. In some papers, the authors ensure that ferroelectricity can occur even in materials that do not have a polar axis of symmetry.

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Influence of surface charges on the emission polarization properties of single CdSe/CdS dot-in-rods
Guo-Feng Zhang, Chang-Gang Yang, Yong Ge, Yong-Gang Peng, Rui-Yun Chen, Cheng-Bing Qin, Yan Gao, Lei Zhang, Hai-Zheng Zhong, Yu-Jun Zheng, Lian-Tuan Xiao, Suo-Tang Jia
Frontiers of Physics. 2019, 14 (6): 63601-.

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We report an experimental investigation of the influence of surface charges on the emission polarization properties of single CdSe/CdS dot-in-rods (DRs), which is important for their polarization-based practical applications. By covering the single DRs with N-type semiconductor indium tin oxide (ITO) nanoparticles, the surface of single DRs is charged by ITO through interfacial electron transfer. This is confirmed by the experimental observations of the reduced photoluminescence intensities and lifetimes as well as the suppressing blinking. It is found that the full width at half maximum of histogram of polarization degrees of the single DRs is broadened from 0.24 (on glass) to 0.41 (in ITO). In order to explain the exprimental results, the band-edge exciton fine structure of single DRs is calculated by taking into account the sample parameters, the emission polarization, and the surface charges. The calculation results show that the level ordering of the emitting states determines the polarization degrees tending to increase or decrease under the influence of surface electrons. The surface electrons can induce an increase in the spacing between the emitting levels to change the populations and thus change the polarization degrees. In addition, different numbers of surface electrons may randomly distribute on the long CdSe/CdS rods, leading to the heterogeneous influences on the single DRs causing the broadening of polarization degrees also.

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Evidence of anisotropic Landau level splitting in topological semimetal ZrSiS under high magnetic fields
Jun-Ran Zhang, Bo Liu, Ming Gao, Yong-Bing Xu, Rong Zhang
Frontiers of Physics. 2019, 14 (6): 63602-.

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Magneto-transport study has been performed in topological semimetal ZrSiS single crystals under high pulsed magnetic fields. Obvious dependence of Landau level splitting on temperature and angular was investigated. The strong three-dimensional anisotropic nature of Landau level splitting under high pulsed magnetic fields was revealed by the angular dependent measurements, in which the orbital contribution is more dominant than Zeeman splitting. Our studies provide more insights into the physical properties of topological semimetals ZrSiS and shed light on future spintronic applications of ZrSiS.

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Universal conductance fluctuations in Sierpinski carpets
Yu-Lei Han, Zhen-Hua Qiao
Frontiers of Physics. 2019, 14 (6): 63603-.

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We theoretically investigate the conductance fluctuation of two-terminal device in Sierpinski carpets. We find that, for the circular orthogonal ensemble (COE), the conductance fluctuation does not display a universal feature; but for circular unitary ensemble (CUE) without time-reversal symmetry or circular symplectic ensemble (CSE) without spin-rotational symmetry, the conductance fluctuation can reach an identical universal value of 0.74±0.01(e2/h). We further find that the conductance distributions around the critical disorder strength for both CUE and CSE systems share the similar distribution forms. Our findings provide a better understanding of the electronic transport properties of the regular fractal structure.

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Exclusive semileptonic decays of D and Ds mesons in the covariant confining quark model
M. A. Ivanov, J. G. Körner, J. N. Pandya, P. Santorelli, N. R. Soni, C. T. Tran
Frontiers of Physics. 2019, 14 (6): 64401-.

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Recently, the BESIII collaboration has reported numerous measurements of various D(s) meson semileptonic decays with significantly improved precision. Together with similar studies carried out at BABAR, Belle, and CLEO, new windows to a better understanding of weak and strong interactions in the charm sector have been opened. In light of new experimental data, we review the theoretical description and predictions for the semileptonic decays of D(s) to a pseudoscalar or a vector meson. This review is essentially an extended discussion of our recently published results obtained in the framework of the covariant confining quark model.

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The delay time of gravitational wave – gamma-ray burst associations
Bing Zhang
Frontiers of Physics. 2019, 14 (6): 64402-.

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The first gravitational wave (GW) – gamma-ray burst (GRB) association, GW170817/GRB 170817A, had an offset in time, with the GRB trigger time delayed by ~1.7 s with respect to the merger time of the GW signal. We generally discuss the astrophysical origin of the delay time, Δt, of GW-GRB associations within the context of compact binary coalescence (CBC) – short GRB (sGRB) associations and GW burst – long GRB (lGRB) associations. In general, the delay time should include three terms, the time to launch a clean (relativistic) jet, Δtjet; the time for the jet to break out from the surrounding medium, Δtbo; and the time for the jet to reach the energy dissipation and GRB emission site, ΔtGRB. For CBC-sGRB associations, Δtjet and Δtbo are correlated, and the final delay can be from 10 ms to a few seconds. For GWB-lGRB associations, Δtjet and Δtbo are independent. The latter is at least ~10 s, so that Δt of these associations is at least this long. For certain jet launching mechanisms of lGRBs, Δt can be minutes or even hours long due to the extended engine waiting time to launch a jet. We discuss the cases of GW170817/GRB 170817A and GW150914/GW150914-GBM within this theoretical framework and suggest that the delay times of future GW/GRB associations will shed light into the jet launching mechanisms of GRBs.

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