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 language | English |
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Article number | 197402 |
Pages (from-to) | - |
Number of pages | 4 |
Journal | Physical Review Letters |
Volume | 94 |
Issue number | 19 |
DOIs | |
Publication status | Published - 20 May 2005 |