Triplet-singlet relaxation in semiconductor single and double quantum dots

K. Shen and M. W. Wu

Phys. Rev. B 76, 235313 – Published 17 December 2007

Abstract

We study the triplet-singlet relaxation in two-electron semiconductor quantum dots. Both single dots and vertically coupled double dots are discussed. In our work, the electron-electron Coulomb interaction, which plays an important role in the electronic structure, is included. The spin mixing is caused by spin-orbit coupling which is the key to the triplet-singlet relaxation. We show that the selection rule widely used in the literature is incorrect unless near the crossing and/or anticrossing point in single quantum dots. The triplet-singlet relaxation in double quantum dots can be markedly changed by varying barrier height, interdot distance, external magnetic field, and dot size.

Received 20 August 2007

DOI:https://doi.org/10.1103/PhysRevB.76.235313

Authors & Affiliations

K. Shen¹ and M. W. Wu^1,2,*

¹Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui 230026, China
²Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, China†

^*Author to whom correspondence should be addressed; mwwu@ustc.edu.cn
^†Mailing address.

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Issue

Vol. 76, Iss. 23 — 15 December 2007

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Physical Review B

covering condensed matter and materials physics