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Phonon-Induced Decay of the Electron Spin in Quantum Dots
Open accessAbstract
We study spin relaxation and decoherence in a GaAs quantum dot due to spin-orbit (SO) interaction. We derive an effective Hamiltonian which couples the electron spin to phonons or any other fluctuation of the dot potential. We show that the spin decoherence time ${T}_{2}$ is as large as the spin relaxation time ${T}_{1}$, under realistic conditions. For the Dresselhaus and Rashba SO couplings, we find that, in leading order, the effective $B$ field can have only fluctuations transverse to the applied $B$ field. As a result, ${T}_{2}=2{T}_{1}$ for arbitrarily large Zeeman splittings, in contrast to the naively expected case ${T}_{2}\ensuremath{\ll}{T}_{1}$. We show that the spin decay is drastically suppressed for certain $B$-field directions and ratios of SO coupling constants. Finally, for the spin-phonon coupling, we show that ${T}_{2}=2{T}_{1}$ for all SO mechanisms in leading order in the electron-phonon interaction.
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Quantum computation with quantum dots
Loss, D., & DiVincenzo, D. P. (1998) · Physical Review A · doi:10.1103/physreva.57.120 · Cited by 6,840
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Metadata
- Authors
- Golovach, V. N., Khaetskii, A., & Loss, D.
- Venue
- Physical Review Letters
- Publisher
- American Physical Society (APS)
- Published
- 2004-06-28
- Volume
- 93
- Issue
- 1
- ISSN
- 0031-9007 (ISSN-L)
- 1079-7114
- OpenAlex
- W2077300239
- Cited by
- 462
- References
- 1
- FWCI
- 27.03
- Type
- journal article
- Language
- en
- Open access
- green
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