Voltage control of the spin dynamics of an exciton in a semiconductor quantum dot

J. M. Smith, P. A. Dalgarno, R. J. Warburton, A. O. Govorov, K. Karrai, B. D. Gerardot, P. M. Petroff

Research output: Contribution to journalArticle

139 Citations (Scopus)

Abstract

We report the observation of a spin-flip process in a quantum dot whereby a dark exciton with total angular momentum L=2 becomes a bright exciton with L=1. The spin-flip process is revealed in the decay dynamics following nongeminate excitation. We are able to control the spin-flip rate by more than an order of magnitude simply with a dc voltage. The spin-flip mechanism involves a spin exchange with the Fermi sea in the back contact of our device and corresponds to the high temperature Kondo regime. We use the Anderson Hamiltonian to calculate a spin-flip rate, and we find excellent agreement with the experimental results. © 2005 The American Physical Society.

Original languageEnglish
Article number197402
Pages (from-to)-
Number of pages4
JournalPhysical Review Letters
Volume94
Issue number19
DOIs
Publication statusPublished - 20 May 2005

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