Semiconductor charge qubit relaxation due to two-phonon processes

Details Semiconductor charge qubit relaxation due to two-phonon processes Semiconductor charge qubit relaxation due to two-phonon processes

2005-08-09

arxiv.org/abs/cond-mat/0508239v1

Phys. Rev. B 73, 205313 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Submitted to PRB

Scientific paper

10.1103/PhysRevB.73.205313

We theoretically study the relaxation of electron orbital states of a double quantum dot system due to two-phonon processes. In particular, we calculate how the relaxation rates depend on the separation distance between the quantum dots, the strength of quantum dot confinement, and the lattice temperature. Enhancement of the rates by specific inter-dot distances and lattice temperatures, and the relative strength of different scattering channels are discussed. Our results show that although at low temperatures ($T \sim 1$ K) two-phonon processes are almost four orders of magnitude weaker compared to one-phonon processes in relaxing electron orbital states, at room temperature they are as important as one-phonon processes.

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