Phonon-induced dephasing of singlet-triplet superpositions in double quantum dots without spin-orbit coupling

Details Phonon-induced dephasing of singlet-triplet superpositions in double quantum dots without spin-orbit coupling Phonon-induced dephasing of singlet-triplet superpositions in double quantum dots without spin-orbit coupling

2009-03-04

arxiv.org/abs/0903.0783v2

Phys. Rev. B 80, 19531 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Extended version

Scientific paper

10.1103/PhysRevB.80.195315

We show that singlet-triplet superpositions of two-electron spin states in a double quantum dot undergo a phonon-induced pure dephasing which relies only on the tunnel coupling between the dots and on the Pauli exclusion principle. As such, this dephasing process is independent of spin-orbit coupling or hyperfine interactions. The physical mechanism behind the dephasing is elastic phonon scattering, which persists to much lower temperatures than real phonon-induced transitions. Quantitative calculations performed for a lateral GaAs/AlGaAs gate-defined double quantum dot yield micro-second dephasing times at sub-Kelvin temperatures, which is consistent with experimental observations.

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