Significance of an external magnetic field on two-phonon processes in gated lateral semiconductor quantum dots

TL;DR

This paper investigates how an external magnetic field influences two-phonon electron scattering processes in gated lateral semiconductor quantum dots, highlighting the dependence on magnetic field, temperature, and quantum dot separation.

Contribution

It provides a theoretical and numerical analysis of two-phonon processes in quantum dots under magnetic fields, incorporating deformation potential and piezoelectric interactions.

Findings

Scattering rate strongly depends on magnetic field strength.

Temperature significantly affects two-phonon scattering.

Quantum dot separation influences scattering rates.

Abstract

Theoretical and numerical calculations of two-phonon processes on gated lateral semiconductor quantum dots (QDs) are outlined. A heterostructure made with two laterally coupled QDs, in the presence of an external magnetic field, has been employed in order to study the electron scattering rate due to two-phonon processes. The formalism is based on the acoustic phonon modes via the unscreened deformation potential and the piezoelectric interaction whenever the crystal lattice lacks a center of inversion symmetry. The rates are calculated by using second order perturbation theory. The strong dependence of the scattering rate on the external magnetic field, lattice temperature and QDs separation distance is presented.