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

doi:10.1103/PhysRevLett.94.197402

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

School of Engineering & Physical Sciences

Research output: Contribution to journal › Article › peer-review

149 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 language	English
Article number	197402
Pages (from-to)	-
Number of pages	4
Journal	Physical Review Letters
Volume	94
Issue number	19
DOIs	https://doi.org/10.1103/PhysRevLett.94.197402
Publication status	Published - 20 May 2005

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10.1103/PhysRevLett.94.197402

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title = "Voltage control of the spin dynamics of an exciton in a semiconductor quantum dot",

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. {\textcopyright} 2005 The American Physical Society.",

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AU - Dalgarno, P. A.

AU - Warburton, R. J.

AU - Govorov, A. O.

AU - Karrai, K.

AU - Gerardot, B. D.

AU - Petroff, P. M.

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AB - 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.

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

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