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Spin-Orbit Coupling, Antilocalization, and Parallel Magnetic Fields in Quantum Dots

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We investigate antilocalization due to spin-orbit coupling in ballistic GaAs quantum dots. Antilocalization that is prominent in large dots is suppressed in small dots, as anticipated theoretically. Parallel magnetic fields suppress both antilocalization and also, at larger fields, weak localization, consistent with random matrix theory results once orbital coupling of the parallel field is included. In situ control of spin-orbit coupling in dots is demonstrated as a gate-controlled crossover from weak localization to antilocalization.
OriginalsprogEngelsk
TidsskriftPhysical Review Letters
Vol/bind89
Udgave nummer27
Sider (fra-til)276803
Antal sider4
ISSN0031-9007
DOI
StatusUdgivet - 22 aug. 2002

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