The Kondo temperature of a two-dimensional electron gas with Rashba spin–orbit coupling
The Kondo temperature of a two-dimensional electron gas with Rashba spin–orbit coupling
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DOI：
10.1088/0953-8984/28/39/396005
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发表时间：
2015-03
期刊：
影响因子：
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通讯作者：
Liang Chen;Jinhua Sun;Ho-Kin Tang;Hai-Qing Lin
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文献类型：
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作者：
Liang Chen;Jinhua Sun;Ho-Kin Tang;Hai-Qing Lin
用Hirsch-Fye量子蒙特卡罗方法研究了具有Rashba自旋-轨道耦合的二维电子气中的单磁杂质问题。我们计算了不同自旋-轨道耦合、Hubbard相互作用和化学势的自旋磁化率。通过对自旋磁化率普适曲线的拟合，估算了不同参数下的近藤温度。我们发现，当化学势接近导带边缘时，Kondo温度几乎是Rashba自旋轨道能量的线性函数。当化学势远离能带边缘时，近藤温度与自旋-轨道耦合无关。这些结果表明，对于该系统中的单杂质问题，改变Kondo温度的最重要原因是带边附近态密度的发散，而发散是由Rashba自旋-轨道耦合引起的。
We use the Hirsch–Fye quantum Monte Carlo method to study the single magnetic impurity problem in a two-dimensional electron gas with Rashba spin–orbit coupling. We calculate the spin susceptibility for various values of spin–orbit coupling, Hubbard interaction, and chemical potential. The Kondo temperatures for different parameters are estimated by fitting the universal curves of spin susceptibility. We find that the Kondo temperature is almost a linear function of Rashba spin–orbit energy when the chemical potential is close to the edge of the conduction band. When the chemical potential is far away from the band edge, the Kondo temperature is independent of the spin–orbit coupling. These results demonstrate that, for single impurity problems in this system, the most important reason to change the Kondo temperature is the divergence of density of states near the band edge, and the divergence is induced by the Rashba spin–orbit coupling.