Temperature dependence of spin-polarized electron transport including electron-electron interaction
Temperature dependence of spin-polarized electron transport including electron-electron interaction
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DOI：
10.1063/1.2959833
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发表时间：
2008-07
影响因子：
3.2
通讯作者：
Y. Takahashi;N. Inaba;F. Hirose
中科院分区：
文献类型：
--
作者：
Y. Takahashi;N. Inaba;F. Hirose
在自旋极化系统中，载流子输运受到电子-电子相互作用的影响。我们数值研究了自旋极化的二维电子气在GaAs异质结中的输运系数，从10 K到室温，在存在电子-电子相互作用引起的库仑力。通过自旋向上和自旋向下的电子之间的碰撞（自旋拖曳）交换动量以及由多电子关联产生的电子能量重整化来修改传输。我们的计算表明，在高温下的迁移率是受电子-电子相互作用的影响较小，而扩散系数显示复杂的温度依赖性所造成的自旋阻力和能量重整化。
Carrier transport is modified by electron-electron interaction in spin-polarized systems. We numerically investigated transport coefficients in a spin-polarized two-dimensional electron gas in a heterostructure of GaAs from 10 K up to room temperature in the presence of electron-electron interaction caused by the Coulomb force. Transport is modified by the exchange of momentum between spin-up and spin-down electrons through their collisions (spin drag) and also by the electron energy renormalization arising from many-electron correlations. Our calculations show that the mobility is less affected by electron-electron interaction at high temperatures, while the diffusion coefficients show complex temperature dependence caused by both spin drag and energy renormalization.