Non-Markoffian theory of electron spin decoherence in a single quantum dot

T. Takagahara

doi:10.1063/1.2730395

Non-Markoffian theory of electron spin decoherence in a single quantum dot

T. Takagahara

Department of Physics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

We investigate theoretically the electron spin relaxation and decoherence rates in a single quantum disk and clarify their dependence on the magnetic field strength, the temperature and the strength of quantum confinement. In the weak confinement regime, the spin relaxation rate at low temperatures is dominated by the two-phonon processes and its dependence on the magnetic field is rather weak. In the strong confinement regime, on the other hand, the spin relaxation rate at low temperatures is governed by the one-phonon processes and exhibits the characteristic B⁴ dependence on the magnetic field (B). Non-Markoffian theory is developed for the electron spin decoherence rate due to the electron-phonon interactions based on the double Feynman diagrams. The dependencies of the electron spin decoherence rate on the magnetic field and the temperature are clarified.

Original language	English
Title of host publication	Physics of Semiconductors - 28th International Conference on the Physics of Semiconductors, ICPS 2006, Part A and B
Pages	1333-1334
Number of pages	2
DOIs	https://doi.org/10.1063/1.2730395
Publication status	Published - 2007 Dec 1
Event	28th International Conference on the Physics of Semiconductors, ICPS 2006 - Vienna, Austria Duration: 2006 Jul 24 → 2006 Jul 28

Publication series

Name	AIP Conference Proceedings
Volume	893
ISSN (Print)	0094-243X
ISSN (Electronic)	1551-7616

Other

Other	28th International Conference on the Physics of Semiconductors, ICPS 2006
Country	Austria
City	Vienna
Period	06/7/24 → 06/7/28

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Keywords

Electron spin decoherence
Electron spin relaxation
Electron-phonon interactions
Quantum disk

ASJC Scopus subject areas

Physics and Astronomy(all)

Cite this

Takagahara, T. (2007). Non-Markoffian theory of electron spin decoherence in a single quantum dot. In Physics of Semiconductors - 28th International Conference on the Physics of Semiconductors, ICPS 2006, Part A and B (pp. 1333-1334). (AIP Conference Proceedings; Vol. 893). https://doi.org/10.1063/1.2730395

Takagahara, T 2007, Non-Markoffian theory of electron spin decoherence in a single quantum dot. in Physics of Semiconductors - 28th International Conference on the Physics of Semiconductors, ICPS 2006, Part A and B. AIP Conference Proceedings, vol. 893, pp. 1333-1334, 28th International Conference on the Physics of Semiconductors, ICPS 2006, Vienna, Austria, 06/7/24. https://doi.org/10.1063/1.2730395

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AB - We investigate theoretically the electron spin relaxation and decoherence rates in a single quantum disk and clarify their dependence on the magnetic field strength, the temperature and the strength of quantum confinement. In the weak confinement regime, the spin relaxation rate at low temperatures is dominated by the two-phonon processes and its dependence on the magnetic field is rather weak. In the strong confinement regime, on the other hand, the spin relaxation rate at low temperatures is governed by the one-phonon processes and exhibits the characteristic B4 dependence on the magnetic field (B). Non-Markoffian theory is developed for the electron spin decoherence rate due to the electron-phonon interactions based on the double Feynman diagrams. The dependencies of the electron spin decoherence rate on the magnetic field and the temperature are clarified.

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Access to Document

10.1063/1.2730395