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.
Original languageEnglish
JournalPhysical Review Letters
Volume89
Issue number27
Pages (from-to)276803
Number of pages4
ISSN0031-9007
DOIs
Publication statusPublished - 22 Aug 2002

    Research areas

  • cond-mat.mes-hall, cond-mat.mtrl-sci

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