Control of Dephasing and Phonon Emission in Coupled Quantum Dots
S. Debald, T. Brandes, B. Kramer
Abstract
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.
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