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- W3087722012 abstract "Two-dimensional hole gases in semiconductor quantum wells are promising platforms for spintronics and quantum computation but suffer from the lack of the $bf{k}$-linear term in the Rashba spin-orbit coupling (SOC), which is essential for spin manipulations without magnetism and commonly believed to be a $bf{k}$-cubic term as the lowest order. Here, contrary to conventional wisdom, we uncover a strong and tunable $bf{k}$-linear Rashba SOC in two-dimensional hole gases (2DHG) of semiconductor quantum wells by performing atomistic pseudopotential calculations combined with an effective Hamiltonian for a model system of Ge/Si quantum wells. Its maximal strength exceeds 120 meV{AA}, comparable to the highest values reported in narrow bandgap III-V semiconductor 2D electron gases, which suffers from short spin lifetime due to the presence of nuclear spin. We also illustrate that this emergent $bf{k}$-linear Rashba SOC is a first-order direct Rashba effect, originating from a combination of heavy-hole-light-hole mixing and direct dipolar intersubband coupling to the external electric field. These findings confirm Ge-based 2DHG to be an excellent platform towards large-scale quantum computation." @default.
- W3087722012 created "2020-09-25" @default.
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- W3087722012 date "2021-02-23" @default.
- W3087722012 modified "2023-10-14" @default.
- W3087722012 title "Emergence of strong tunable linear Rashba spin-orbit coupling in two-dimensional hole gases in semiconductor quantum wells" @default.
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- W3087722012 doi "https://doi.org/10.1103/physrevb.103.085309" @default.
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