Charge decoherence in laterally coupled quantum dots due to electron-phonon interactions

Details Charge decoherence in laterally coupled quantum dots due to electron-phonon interactions Charge decoherence in laterally coupled quantum dots due to electron-phonon interactions

2005-03-18

arxiv.org/abs/cond-mat/0503481v2

Phys. Rev. B 72, 075362 (2005)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

References updated, typos corrected, accepted to PRB

Scientific paper

10.1103/PhysRevB.72.075362

We investigate electron charge decoherence in a laterally-coupled single-electron semiconductor double quantum dot through electron-phonon interaction. We analytically and numerically evaluate the relaxation and dephasing rates due to electron coupling to both acoustic and optical phonons, and explore the system parameter space in terms of interdot distance, strength of single-dot confinement, and inter-dot coupling strength. Our numerical results show that the electron scattering rates are strongly dependent on the strength of the electron confinement and the size of the system. In addition, although the most dominant factor that determines the charge decoherence rate is the energy splitting between the charge qubit states, the details of the double dot configuration is also very important.

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