The Ising spin–orbit coupling could give rise to the spin-triplet Cooper pairs and equal-spin Andreev reflection(AR)in Ising superconductors.Here we theoretically study the valley-dependent equal-spin AR in a ferroma...The Ising spin–orbit coupling could give rise to the spin-triplet Cooper pairs and equal-spin Andreev reflection(AR)in Ising superconductors.Here we theoretically study the valley-dependent equal-spin AR in a ferromagnet/Ising superconductor junction with a circularly polarized light applied to the ferromagnet.Because of the spin-triplet Cooper pairs and the optical irradiation,eight kinds of AR processes appear in the junction,including equal-spin AR and normal AR,the strengths and properties of which strongly depend on the valley degree of freedom.The AR probabilities for the incident electron from the two valleys exhibit certain symmetry with respect to the magnetization angle and the effective energy of light.The equal-spin AR and normal AR present different features and resonant behaviors near the superconducting gap edges.Due to equal-spin-triplet Cooper pairs,not only charge supercurrent but also spin supercurrent can transport in the Ising superconductors.The differential spin conductance for electron injecting from the two valleys can be controlled by the circularly polarized light.展开更多
The transport property of electron through graphene-based double-barrier under a time periodic field is investigated. We study the influence of the system parameters and external field strength on the transmission pro...The transport property of electron through graphene-based double-barrier under a time periodic field is investigated. We study the influence of the system parameters and external field strength on the transmission probability. The results show that transmission exhibits various kinds of behavior with the change of parameters due to its angular anisotropy. One could control the values of transmission and conductivity as well as their distribution in each band by tuning the parameters.展开更多
The influence of parameters such as the strength and frequency of a periodic driving force on the tunneling dynamics is investigated in a symmetric triple-well potential. It is shown that for some special values of th...The influence of parameters such as the strength and frequency of a periodic driving force on the tunneling dynamics is investigated in a symmetric triple-well potential. It is shown that for some special values of the parameters, tunneling could be enhanced considerably or suppressed completely. Quantum fluctuation during the tunneling is discussed as well and the numerical results are presented and analysed by virtue of Floquet formalism.展开更多
By using the Faddeev Senjanovic path integral quantization method, we quantize the composite fermions in quantum electrodynamics （QED）. In the sense of Dirac＇s conjecture, we deduce all the constraints and give Di...By using the Faddeev Senjanovic path integral quantization method, we quantize the composite fermions in quantum electrodynamics （QED）. In the sense of Dirac＇s conjecture, we deduce all the constraints and give Dirac＇s gauge transformations （DGT）. According to that the effective action is invariant under the DGT, we obtain the Noether theorem at the quantum level, which shows the fractional charges for tile composite fermions in QBD. This result is better than the one deduced from the equations of motion for the statistical potentials, because this result contains both odd and even fractional numbers. Purthermore, we deduce the Noether theorem from the invariance of the effective action under the rotational transformations in 2-dimensional （x, y） plane. The result shows that the composite fermions have fractional spins and fractional statistics. These anomalous properties are given by the constraints for the statistical gauge potential.展开更多
目的了解广州市青少年男男性行为者(man who have sex with man,MSM)社会支持状况,并探究其影响因素。方法利用社会支持评定量表对广州市477名青少年MSM进行评定;采用t检验、方差分析、多元线性逐步回归分析对该人群的社会支持状况进行...目的了解广州市青少年男男性行为者(man who have sex with man,MSM)社会支持状况,并探究其影响因素。方法利用社会支持评定量表对广州市477名青少年MSM进行评定;采用t检验、方差分析、多元线性逐步回归分析对该人群的社会支持状况进行单因素和多因素分析。结果477名青少年MSM社会支持评定量表总分为(33.93±7.02)分,其中客观支持(6.40±2.36)分、主观支持(20.39±3.83)分、社会支持利用度(7.14±2.65)分。多因素分析显示,安全套使用频率与社会支持利用度和社会支持总分相关;同性性伴数量与客观支持、社会支持利用度和社会支持总分相关;饮酒频率与客观支持、主观支持和社会支持总分相关;性伴侣选择为配偶或固定伴侣在客观支持、主观支持、社会支持利用度和社会支持总分高于临时和商业性伴,P值均<0.05。结论广州市青少年MSM的各维度社会支持得分普遍较低。建议有关部门要尽可能地改善该重点人群的社会支持状况,联合社会、学校和家庭提供针对性支持措施以提高其社会支持水平,进而提高生活质量。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11974153,12374034 and 11921005)the Innovation Program for Quantum Science and Technology(Grant No.2021ZD0302403)the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDB28000000)。
文摘The Ising spin–orbit coupling could give rise to the spin-triplet Cooper pairs and equal-spin Andreev reflection(AR)in Ising superconductors.Here we theoretically study the valley-dependent equal-spin AR in a ferromagnet/Ising superconductor junction with a circularly polarized light applied to the ferromagnet.Because of the spin-triplet Cooper pairs and the optical irradiation,eight kinds of AR processes appear in the junction,including equal-spin AR and normal AR,the strengths and properties of which strongly depend on the valley degree of freedom.The AR probabilities for the incident electron from the two valleys exhibit certain symmetry with respect to the magnetization angle and the effective energy of light.The equal-spin AR and normal AR present different features and resonant behaviors near the superconducting gap edges.Due to equal-spin-triplet Cooper pairs,not only charge supercurrent but also spin supercurrent can transport in the Ising superconductors.The differential spin conductance for electron injecting from the two valleys can be controlled by the circularly polarized light.
基金Supported in part by the National Natural Science Foundation of China under Grant Nos 90503088 and 10775100, and the Fund of Theoretical Nuclear Center of HIRFL of China.
基金Supported in part by the National Natural Science Foundation of China under Grant Nos. 10775100, 10974137, 11047172, 11047020, and 11047173by the Fund of Nuclear Theory Center of HIRFL of China
文摘The transport property of electron through graphene-based double-barrier under a time periodic field is investigated. We study the influence of the system parameters and external field strength on the transmission probability. The results show that transmission exhibits various kinds of behavior with the change of parameters due to its angular anisotropy. One could control the values of transmission and conductivity as well as their distribution in each band by tuning the parameters.
基金supported by the National Natural Science Foundation of China (Grant Nos. 10974137 and 10775100)
文摘The influence of parameters such as the strength and frequency of a periodic driving force on the tunneling dynamics is investigated in a symmetric triple-well potential. It is shown that for some special values of the parameters, tunneling could be enhanced considerably or suppressed completely. Quantum fluctuation during the tunneling is discussed as well and the numerical results are presented and analysed by virtue of Floquet formalism.
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 11047020 and 11047173)the Natural Science Foundation of Shandong Province, China (Grant Nos. ZR2011AM019, ZR2010AQ025, BS2010DS006, and Y200814)the Scientific and Technological Development Project of Shandong Province, China (Grant No. J08LI56)
文摘By using the Faddeev Senjanovic path integral quantization method, we quantize the composite fermions in quantum electrodynamics （QED）. In the sense of Dirac＇s conjecture, we deduce all the constraints and give Dirac＇s gauge transformations （DGT）. According to that the effective action is invariant under the DGT, we obtain the Noether theorem at the quantum level, which shows the fractional charges for tile composite fermions in QBD. This result is better than the one deduced from the equations of motion for the statistical potentials, because this result contains both odd and even fractional numbers. Purthermore, we deduce the Noether theorem from the invariance of the effective action under the rotational transformations in 2-dimensional （x, y） plane. The result shows that the composite fermions have fractional spins and fractional statistics. These anomalous properties are given by the constraints for the statistical gauge potential.
文摘目的了解广州市青少年男男性行为者(man who have sex with man,MSM)社会支持状况,并探究其影响因素。方法利用社会支持评定量表对广州市477名青少年MSM进行评定;采用t检验、方差分析、多元线性逐步回归分析对该人群的社会支持状况进行单因素和多因素分析。结果477名青少年MSM社会支持评定量表总分为(33.93±7.02)分,其中客观支持(6.40±2.36)分、主观支持(20.39±3.83)分、社会支持利用度(7.14±2.65)分。多因素分析显示,安全套使用频率与社会支持利用度和社会支持总分相关;同性性伴数量与客观支持、社会支持利用度和社会支持总分相关;饮酒频率与客观支持、主观支持和社会支持总分相关;性伴侣选择为配偶或固定伴侣在客观支持、主观支持、社会支持利用度和社会支持总分高于临时和商业性伴,P值均<0.05。结论广州市青少年MSM的各维度社会支持得分普遍较低。建议有关部门要尽可能地改善该重点人群的社会支持状况,联合社会、学校和家庭提供针对性支持措施以提高其社会支持水平,进而提高生活质量。
