Control of Dephasing and Phonon Emission in Coupled Quantum Dots

TL;DR

This paper predicts that phonon subband quantization can be observed in electron current through double quantum dots in nano-sized slabs, allowing control over dephasing and phonon emission by tuning energy levels.

Contribution

It introduces the concept of phonon subband effects in coupled quantum dots embedded in nano-cavities, showing how to manipulate phonon interactions via energy level tuning.

Findings

Phonon subband quantization affects electron current in quantum dots.

Tuning energy levels can reduce or enhance phonon scattering.

Control over phonon emission and dephasing is achievable.

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 $\Delta$, 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.