论文标题
在垂直磁场下与Rashba自旋轨道耦合的二维电子气体的光诱导的电子和自旋特性
Photoinduced electronic and spin properties of two-dimensional electron gases with Rashba spin-orbit coupling under perpendicular magnetic fields
论文作者
论文摘要
我们从理论上研究了由Rashba旋转轨耦合的垂直磁场下的二维电子气体中的时间周期性驱动场引起的光诱导的现象。使用扰动理论，我们为由于THZ辐射而出现的Floquet-Landau能量谱提供了分析结果。通过采用所得的光调节状态，我们计算最初制备的相干状态的自旋极化函数的动力学演变。我们发现磁场，Rashba自旋轨道相互作用和THZ辐射的相互作用会导致自旋极化的反转。该动力学还导致由于光调节量子状态的干扰，在自相关函数中引起了分数复兴和非平凡的跳动模式。我们还使用Kubo形式主义计算线性响应方案中的横向照片辅助电导率，并分析辐射场和Rashba旋转轨道相互作用的影响。在静态极限中，我们发现我们的结果降低了二维电子气体在文献中彻底描述的二维电子气体中的非相关性和准论性（拓扑绝缘子表面）中的电导率表达。我们讨论了我们的理论预测的可能检测及其与高磁场上自旋轨道物理学的相关性。
We theoretically investigate photoinduced phenomena induced by time-periodic driving fields in two-dimensional electron gases under perpendicular magnetic fields with Rashba spin-orbit coupling. Using perturbation theory, we provide analytical results for the Floquet-Landau energy spectrum appearing due to THz radiation. By employing the resulting photo-modulated states, we compute the dynamical evolution of the spin polarization function for an initially prepared coherent state. We find that the interplay of the magnetic field, Rashba spin-orbit interaction and THz radiation can lead to inversion of the spin polarization. The dynamics also induces fractional revivals and non-trivial beating patterns in the autocorrelation function due to interference of the photo-modulated quantum states. We also calculate the transverse photo-assisted conductivity in the linear response regime using Kubo formalism and analyze the impact of the radiation field and Rashba spin-orbit interaction. In the static limit, we find that our results reduce to well-known expressions of the conductivity in non-relativistic and quasi-relativistic (topological insulator surfaces) two-dimensional electron gas thoroughly described in the literature. We discuss the possible experimental detection of our theoretical prediction and their relevance for spin-orbit physics at high magnetic fields.
