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Spin texture and Berry phase for heavy-mass holes confined in SiGe mixed-alloy two-dimensional system: Intersubband interaction via the coexistence of Rashba and Dresselhaus spin-orbit interactions
Physics Letters A ( IF 2.3 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.physleta.2020.127091
Tatsuki Tojo , Kyozaburo Takeda

Abstract By extending the k ⋅ p approach, we study the spin texture and Berry phase of heavy-mass holes (HHs) confined in the SiGe two-dimensional (2D) quantum well system, focusing on the intersubband interaction via the coexistence of the Rashba and Dresselhaus spin-orbit interactions (SOIs). The coexistence of both SOIs generates spin-stabilized(+)/destabilized(-) HHs. The strong intersubband interaction causes quasi-degenerate states resembling the 2D massive Dirac fermion. Consequently, the Berry phases of HHs have unique energy dependence understood by counting the quasi-degenerate points with the signs of the Berry phases. Thermal averaging of the Berry phase demonstrates that HH + / − has a peculiar plateau of +π/−π at less than 30 K and then changes its sign at approximately 200 K.

中文翻译:

限制在 SiGe 混合合金二维系统中的重质量空穴的自旋纹理和 Berry 相:通过 Rashba 和 Dresselhaus 自旋轨道相互作用共存的子带间相互作用

摘要 通过扩展 k ⋅ p 方法,我们研究了限制在 SiGe 二维 (2D) 量子阱系统中的重质量空穴 (HHs) 的自旋纹理和 Berry 相,重点是通过 Rashba 共存的子带间相互作用。和德雷塞尔豪斯自旋轨道相互作用 (SOI)。两种 SOI 的共存会产生自旋稳定 (+)/不稳定 (-) HH。强烈的子带间相互作用导致类似于二维大质量狄拉克费米子的准简并态。因此,HHs 的 Berry 相具有独特的能量依赖性,通过计算具有 Berry 相符号的准退化点来理解。Berry 相的热平均表明 HH + / - 在小于 30 K 时具有 +π/-π 的特殊平台,然后在大约 200 K 处改变其符号。
更新日期:2021-02-01
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