Control of Dephasing and Phonon Emission in Coupled Quantum Dots

Details Control of Dephasing and Phonon Emission in Coupled Quantum Dots Control of Dephasing and Phonon Emission in Coupled Quantum Dots

2002-04-20

arxiv.org/abs/cond-mat/0204444v1

Phys. Rev. B 66, 041301(R) (2002)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, accepted for publication as Rapid Comm. in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.66.041301

We predict that phonon subband quantization can be detected in the non-linear electron current through double quantum dot qubits embedded into nano-size semiconductor slabs, acting as phonon cavities. For particular values of the dot level splitting $\Delta$, piezo-electric or deformation potential scattering is either drastically reduced as compared to the bulk case, or strongly enhanced due to phonon van Hove singularities. By tuning $\Delta$ via gate voltages, one can either control dephasing, or strongly increase emission into phonon modes with characteristic angular distributions.

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