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 Δ, 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 Δ via gate voltages, one can either control dephasing, or strongly increase emission into phonon modes with characteristic angular distributions.
@article{arxiv.cond-mat/0204444,
title = {Control of Dephasing and Phonon Emission in Coupled Quantum Dots},
author = {S. Debald and T. Brandes and B. Kramer},
journal= {arXiv preprint arXiv:cond-mat/0204444},
year = {2009}
}
Comments
4 pages, 3 figures, accepted for publication as Rapid Comm. in Phys. Rev. B