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arXiv 0709.2774cond-mat.mtrl-sci
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具有Rashba自旋轨道耦合的二维空穴气体上的强太赫兹laser场

Intense terahertz laser fields on a two-dimensional hole gas with Rashba spin-orbit coupling

Y. Zhou

摘要:

研究了强太赫兹激光场对具有Rashba自旋轨道耦合的二维空穴气体的态密度和自旋极化密度的影响。通过Floquet定理,我们求解了含时的薛定谔方程,并计算了这些密度。结果表明,在低空穴浓度下,可以产生太赫兹磁矩。与电子情况不同,由于各向异性的自旋-轨道耦合,感应磁矩是相当各向异性的。磁矩的幅度和方向都取决于太赫兹场的方向。我们进一步指出,对于高空穴浓度,由于自旋轨道耦合的动量依赖性引起的干扰,磁矩变得很小。这种效应也出现在二维电子系统中。

英文摘要:

We investigate the influence on the density of states and the density of spin polarization for a two-dimensional hole gas with Rashba spin-orbit coupling under intense terahertz laser fields. Via Floquet theorem, we solve the time-dependent Schrödinger equation and calculate these densities. It is shown that a terahertz magnetic moment can be induced for low hole concentration. Different from the electron case, the induced magnetic moment is quite anisotropic due to the anisotropic spin-orbit coupling. Both the amplitude and the direction of the magnetic moment depend on the direction of the terahertz field. We further point out that for high hole concentration, the magnetic moment becomes very small due to the interference caused by the momentum dependence of the spin-orbit coupling. This effect also appears in two-dimensional electron systems.

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