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Compressed H3S: Fits to the Empirical Hc2(T) Data and a Discussion of the Meissner Effect
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作者 Gulshan Prakash Malik Vijaya Shankar Varma 《World Journal of Condensed Matter Physics》 2023年第4期111-127,共17页
Based on μ-, T- and H-dependent pairing and number equations and the premise that μ(T) is predominantly the cause of the variation of the upper critical field H<sub>c</sub><sub>2</sub>(T), wh... Based on μ-, T- and H-dependent pairing and number equations and the premise that μ(T) is predominantly the cause of the variation of the upper critical field H<sub>c</sub><sub>2</sub>(T), where μ, T and H denote the chemical potential, temperature and the applied field, respectively, we provide in this paper fits to the empirical H<sub>c</sub><sub>2</sub>(T) data of H<sub>3</sub>S reported by Mozaffari, et al. (2019) and deal with the issue of whether or not H<sub>3</sub>S exhibits the Meissner effect. Employing a variant of the template given by Dogan and Cohen (2021), we examine in detail the results of Hirsch and Marsiglio (2022) who have claimed that H<sub>3</sub>S does not exhibit the Meissner effect and Minkov, et al. (2023) who have claimed that it does. We are thus led to suggest that monitoring the chemical potential (equivalently, the number density of Cooper pairs N<sub>s</sub> at T = T<sub>c</sub>) should shed new light on the issue being addressed. 展开更多
关键词 Compressed H3S Upper and Lower Critical Fields Chemical Potential Generalized Pairing and Number Equations coherence length Penetration Depth Meissner Effect
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Influences of Atmospheric Turbulence on Image Resolution of Airborne and Space-Borne Optical Remote Sensing System 被引量:2
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作者 张晓芳 俞信 阎吉祥 《Journal of Beijing Institute of Technology》 EI CAS 2006年第4期457-461,共5页
A new way is proposed to evaluate the influence of atmospheric turbulence on image resolution of airborne and space-borne optical remote sensing system, which is called as arrival angle-method. Applying this method, s... A new way is proposed to evaluate the influence of atmospheric turbulence on image resolution of airborne and space-borne optical remote sensing system, which is called as arrival angle-method. Applying this method, some engineering examples are selected to analyze the turbulence influences on image resolution based on three different atmospheric turbulence models quantificationally, for the airborne remote sensing system, the resolution errors caused by the atmospheric turbulence are less than 1 cm, and for the space-borne remote sensing system, the errors are around 1 cm. The results are similar to that obtained by the previous Friedmethod. Compared with the Fried-method, the arrival angle-method is rather simple and can be easily used in engineering fields. 展开更多
关键词 atmospheric turbulence coherence length arrival angle-method airborne or space-borne optical remote sensing system image resolution
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Dark incoherent spatial solitons in logarithmically saturable nonlinear media
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作者 张贻齐 卢克清 +3 位作者 张美志 李可昊 刘爽 张彦鹏 《Chinese Physics B》 SCIE EI CAS CSCD 2009年第6期2359-2363,共5页
This paper studies numerically the dark incoherent spatial solitons propagating in logarithmically saturable nonlinear media by using a coherent density approach and a split-step Fourier approach for the first time. U... This paper studies numerically the dark incoherent spatial solitons propagating in logarithmically saturable nonlinear media by using a coherent density approach and a split-step Fourier approach for the first time. Under odd and even initial conditions, a soliton triplet and a doublet are obtained respectively for given parameters. Simultaneously, coherence properties associated with the soliton triplet and doublet are discussed. In addition, if the values of the parameters are properly chosen, five and four splittings from the input dark incoherent spatial solitons can also form. Lastly, the grayness of the soliton triplet and that of the doublet are studied, in detail. 展开更多
关键词 incoherent spatial solitons coherence length logarithmically nonlinear media
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Properties of a dielectric plate using entangled two-photon states
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作者 周志远 丁冬生 +2 位作者 史保森 邹旭波 郭光灿 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第9期271-278,共8页
We theoretically study the properties of a dielectric plate with a modified Hong-Ou-Mandel interferometer. The fourth-order correlation functions are calculated in two regimes, which are divided depending on the relat... We theoretically study the properties of a dielectric plate with a modified Hong-Ou-Mandel interferometer. The fourth-order correlation functions are calculated in two regimes, which are divided depending on the relative size between the thickness of the dielectric plate and the one-photon coherence length. When the thickness of the dielectric plate is less than the one-photon coherence length, a novel modulation behavior of the coincidence rate is observed, which has not been discussed before. If the thickness of the dielectric plate is larger than the one-photon coherence length, coalescence and anti-coalescence are observed. The obtained results highlight the effects of a linear optical element on fourth-order interference. 展开更多
关键词 entangled two-photon states dielectric plate coherence length
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What Was in the Apparatus before the Click of the Detector?
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作者 Sofia D. Wechsler 《Journal of Quantum Information Science》 2021年第4期125-134,共10页
When a quantum system is described by a superposition of wave-packets, each wave-packet traveling on a separate path, a commonly asked question is <em>why</em> only one of the wave-packets is able to trigg... When a quantum system is described by a superposition of wave-packets, each wave-packet traveling on a separate path, a commonly asked question is <em>why</em> only one of the wave-packets is able to trigger a click in a detector. In the second half of the last century many scientists considered the possibility that not all these wave-packets are identical. Namely, that there exist “full waves” and “empty waves”. The two types of waves were supposed to be identical only in the sense that they are able to produce interference when crossing one another, however, the full wave was supposed to be able to trigger a click in a detector, while the empty wave was supposed to leave the detector silent. The present text describes an experiment in which, for explaining the results, it seems necessary to admit the existence of full and empty waves. 展开更多
关键词 Two-Particle Interference coherence length Full Waves Empty Waves
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Two-dimensional quantum transport of multivalley (111) surface state in topological crystalline insulator SnTe thin films 被引量:1
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作者 Ryota Akiyama Kazuki Fujisawa +2 位作者 Tomonari Yamaguchi Ryo Ishikawa Shinji Kuroda 《Nano Research》 SCIE EI CAS CSCD 2016年第2期490-498,共9页
The magneto-transport properties of (111)-oriented single-crystal thin films of SnTe were investigated. SnTe (111) thin films were epitaxially grown on a BaF2 substrate by molecular beam epitaxy. By optimizing the... The magneto-transport properties of (111)-oriented single-crystal thin films of SnTe were investigated. SnTe (111) thin films were epitaxially grown on a BaF2 substrate by molecular beam epitaxy. By optimizing the growth conditions and the thickness of the films, the bulk carrier density could be reduced, making it possible to detect the surface transport. Magneto-conductance (MC) measurements show a cusp-like feature around zero magnetic field, which is attributed to the weak-antilocalization effect of the transport in the topological surface state. Detailed analysis of this negative MC reveals a reduced number of transport channels contributing to the surface transport, suggesting strong coupling between Dirac valleys on the SnTe (111) surface, as a characteristic feature of the transport in the multivalley structure of topological crystalline insulators. 展开更多
关键词 SnTe (111) films topological crystalline insulators weak antilocalization phase coherence length Dirac valleys
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