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

Research output: Chapter in Book/Report/Conference proceedingConference 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 languageEnglish
Title of host publicationAIP Conference Proceedings
Pages1333-1334
Number of pages2
Volume893
DOIs
Publication statusPublished - 2007
Externally publishedYes
Event28th International Conference on the Physics of Semiconductors, ICPS 2006 - Vienna, Austria
Duration: 2006 Jul 242006 Jul 28

Other

Other28th International Conference on the Physics of Semiconductors, ICPS 2006
CountryAustria
CityVienna
Period06/7/2406/7/28

Fingerprint

electron spin
quantum dots
magnetic fields
Feynman diagrams
electron phonon interactions
field strength
temperature

Keywords

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

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Non-Markoffian theory of electron spin decoherence in a single quantum dot. / Takagahara, Toshihide.

AIP Conference Proceedings. Vol. 893 2007. p. 1333-1334.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Takagahara, T 2007, Non-Markoffian theory of electron spin decoherence in a single quantum dot. in 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
@inproceedings{83dfda03fabe4c1781a981588bfdc53c,
title = "Non-Markoffian theory of electron spin decoherence in a single quantum dot",
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.",
keywords = "Electron spin decoherence, Electron spin relaxation, Electron-phonon interactions, Quantum disk",
author = "Toshihide Takagahara",
year = "2007",
doi = "10.1063/1.2730395",
language = "English",
isbn = "9780735403970",
volume = "893",
pages = "1333--1334",
booktitle = "AIP Conference Proceedings",

}

TY - GEN

T1 - Non-Markoffian theory of electron spin decoherence in a single quantum dot

AU - Takagahara, Toshihide

PY - 2007

Y1 - 2007

N2 - 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.

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.

KW - Electron spin decoherence

KW - Electron spin relaxation

KW - Electron-phonon interactions

KW - Quantum disk

UR - http://www.scopus.com/inward/record.url?scp=77958472069&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=77958472069&partnerID=8YFLogxK

U2 - 10.1063/1.2730395

DO - 10.1063/1.2730395

M3 - Conference contribution

AN - SCOPUS:77958472069

SN - 9780735403970

VL - 893

SP - 1333

EP - 1334

BT - AIP Conference Proceedings

ER -