Spin-orbit coupling, antilocalization, and parallel magnetic fields in quantum dots

Spin-orbit coupling, antilocalization, and parallel magnetic fields in quantum dots

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...

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Veröffentlicht in:Physical review letters 2002-12, Vol.89 (27), p.276803-276803, Article 276803
Hauptverfasser: Zumbühl, D M, Miller, J B, Marcus, C M, Campman, K, Gossard, A C
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container_issue 27
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container_title Physical review letters
container_volume 89
creator Zumbühl, D M
Miller, J B
Marcus, C M
Campman, K
Gossard, A C
description 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.
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title Spin-orbit coupling, antilocalization, and parallel magnetic fields in quantum dots
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