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Size dependent suppression of spin relaxation in electrostatic quantum dots

By Darren Chaney and P. A. Maksym


Triplet-singlet spin relaxation in a vertical electrostatic quantum dot containing two interacting electrons is studied with a realistic model that includes the effects of finite thickness and screening. The spin relaxation mechanism is taken to be spin mixing via the part of the Dresselhaus Hamiltonian that is linear in the lateral momentum. The electron-electron interaction enhances relaxation and finite thickness suppresses it. The relaxation rate varies extremely rapidly with well width, w, approximately like 1/w^18 in zero magnetic field and 1/w^10 in a nonzero magnetic field. In addition, the rate oscillates with w and this leads to further suppression of relaxation. If w is sufficiently large the linear spin mixing mechanism is suppressed to the extent that it is no longer dominant

Publisher: American Physical Society
Year: 2007
DOI identifier: 10.1103/PhysRevB.75.035323
OAI identifier:

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  2. (2007). Spin relaxation rate as a function of B.

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