Electric field control of spin-orbit splittings in GaAs/AlGaAs coupled quantum wells

Details Electric field control of spin-orbit splittings in GaAs/AlGaAs coupled quantum wells Electric field control of spin-orbit splittings in GaAs/AlGaAs coupled quantum wells

2008-04-09

arxiv.org/abs/0804.1483v1

Phys. Rev. B 78, 033302 (1-4) (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

Electron spin dynamics is investigated in n-i-n GaAs/AlGaAs coupled quantum wells. The electron spin dephasing time is measured as a function of an external electrical bias under resonant excitation of the 1sHH intrawell exciton using a time-resolved Kerr rotation technique. It is found a strong electron spin dephasing time anisotropy caused by an interference of the structure inversion asymmetry and the bulk inversion asymmetry. This anisotropy is shown to be controlled by an electrical bias. A theoretical analysis of electron spin dephasing time anisotropy is developed. The ratio of Rashba and Dresselhaus spin splittings is studied as a function of applied bias.

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