Spin-flip phonon-mediated charge relaxation in double quantum dots

J. Danon
Phys. Rev. B 88, 075306 – Published 9 August 2013

Abstract

We theoretically study the (1,1) triplet to (0,2) singlet relaxation rate in a lateral gate-defined double quantum dot tuned to the regime of Pauli spin blockade. We present a detailed derivation of the effective phonon density of states for this specific charge transition, keeping track of the contribution from piezoelectric as well as deformation potential electron-phonon coupling. We further investigate two different spin-mixing mechanisms which can couple the triplet and singlet states: a magnetic field gradient over the double dot (relevant at low external magnetic field) and spin-orbit interaction (relevant at high field), and we also indicate how the two processes could interfere at intermediate magnetic field. Finally, we show how to combine all results and evaluate the relaxation rate for realistic system parameters.

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  • Received 28 February 2013

DOI:https://doi.org/10.1103/PhysRevB.88.075306

©2013 American Physical Society

Authors & Affiliations

J. Danon

  • Dahlem Center for Complex Quantum Systems and Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany and Niels Bohr International Academy, Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, 2100 Copenhagen, Denmark

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Issue

Vol. 88, Iss. 7 — 15 August 2013

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