论文标题
在Rashba和Dresselhaus术语之外的低对称量子井中的旋转分裂
Spin splitting in low-symmetry quantum wells beyond Rashba and Dresselhaus terms
论文作者
论文摘要
半导体结构中的自旋轨道相互作用，即使没有磁场，也会导致电子和孔状态的自旋分裂。我们发现，除了Rashba和Dresselhaus的贡献之外，还有另一种类型的零视野自旋分裂，这是由晶体单元和宏观镜结构不对称的立方形状的相互作用引起的。在沿着低对称晶体学轴的量子井中，这种自旋轨道相互作用将载体旋转的平面成分与平面动量结合在一起，而耦合强度则由结构反转不对称控制。我们执行数值计算并发展一个分析理论，该理论表明这种相互作用可以主导$ \ boldsymbol {k} $ - 重孔子带的线性旋转分裂。
Spin-orbit interaction in semiconductor structures with broken space inversion symmetry leads to spin splitting of electron and hole states even in the absence of magnetic field. We discover that, beyond the Rashba and Dresselhaus contributions, there is an additional type of the zero-field spin splitting which is caused by the interplay of the cubic shape of crystal unit cell and macroscopic structure asymmetry. In quantum wells grown along low-symmetry crystallographic axes, this type of spin-orbit interaction couples the out-of-plane component of carrier's spin with the in-plane momentum while the coupling strength is controlled by structure inversion asymmetry. We carry out numerical calculations and develop an analytical theory, which demonstrate that this interaction can dominate $\boldsymbol{k}$-linear spin splitting of heavy-hole subbands.
