| 振荡磁场量子点中自旋流的交流响应 |
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| 引用本文： | 宋红岩,宋小龙,张爱芳,吴留坡,施耀铭.振荡磁场量子点中自旋流的交流响应[J].上海大学学报(英文版),2007,11(6):566-569. |
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| 作者姓名： | 宋红岩 宋小龙 张爱芳 吴留坡 施耀铭 |
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| 作者单位： | Department of Physics College of Sciences，Shanghai University，Department of Physics，College of Sciences，Shanghai University，Department of Physics，College of Sciences，Shanghai University，Department of Physics，College of Sciences，Shanghai University，Department of Physics，College of Sciences，Shanghai University，Shanghai 200444，P.R.China，Shanghai 200444，P.R.China，Shanghai 200444，P.R.China，Shanghai 200444，P.R.China，Shanghai 200444，P.R.China |
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| 基金项目： | 国家自然科学基金;上海市自然科学基金 |
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| 摘 要： | We investigate alternating response of the spin current in a quantum dot system coupled to a normal metal electrode,to which an alternating driving voltage and a pumping rotating magnetic field are applied.The expression of the time-averaged spin current and its differential is obtained based on a non-equilibrium Green's function method.We find that for a given rotating frequency,the spin current increases rapidly and appears to have small steps when the driven frequency increases.As the driven frequency is further increasing,the spin current can be significantly enhanced and approaches a stable value.The photon-assisted processes bring about interesting features of spin current.The influence of the gate voltage and temperature on the spin current is examined in detail.
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| 关 键 词： | 振荡磁场 量子点 自旋流 交流响应 |
| 收稿时间： | 24 March 2006 |
| 修稿时间： | 2006-03-24 |
Alternating response of spin current in a magnetic-oscillating quantum dot |
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| SONG Hong-yan,SONG Xiao-long,ZHANG Ai-fang,WU Liu-po,SHI Yao-ming.Alternating response of spin current in a magnetic-oscillating quantum dot[J].Journal of Shanghai University(English Edition),2007,11(6):566-569. |
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| Authors: | SONG Hong-yan SONG Xiao-long ZHANG Ai-fang WU Liu-po SHI Yao-ming |
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| Institution: | Department of Physics, College of Sciences, Shanghai University, Shanghai 200444, P. R. China |
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| Abstract: | We investigate alternating response of the spin current in a quantum dot system coupled to a normal metal electrode,to which an alternating driving voltage and a pumping rotating magnetic field are applied.The expression of the time-averaged spin current and its differential is obtained based on a non-equilibrium Green's function method.We find that for a given rotating frequency,the spin current increases rapidly and appears to have small steps when the driven frequency increases.As the driven frequency is further increasing,the spin current can be significantly enhanced and approaches a stable value.The photon-assisted processes bring about interesting features of spin current.The influence of the gate voltage and temperature on the spin current is examined in detail. |
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| Keywords: | spin current AC response photon-assisted tunneling |
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