TY - JOUR
T1 - Spin texture and Berry phase for heavy-mass holes confined in SiGe mixed-alloy two-dimensional system
T2 - Intersubband interaction via the coexistence of Rashba and Dresselhaus spin-orbit interactions
AU - Tojo, Tatsuki
AU - Takeda, Kyozaburo
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/2/15
Y1 - 2021/2/15
N2 - 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.
AB - 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.
KW - Berry phase
KW - Heavy-mass holes
KW - SiGe mixed-alloy
KW - Spin texture
KW - Spin-orbit interaction
KW - Two-dimensional system
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U2 - 10.1016/j.physleta.2020.127091
DO - 10.1016/j.physleta.2020.127091
M3 - Article
AN - SCOPUS:85098464426
SN - 0375-9601
VL - 389
JO - Physics Letters, Section A: General, Atomic and Solid State Physics
JF - Physics Letters, Section A: General, Atomic and Solid State Physics
M1 - 127091
ER -