Electron self-energy and effective mass in a single heterostructure

TL;DR

This study analyzes how electron self-energy and effective mass vary in a GaAs/AlAs heterostructure, revealing their dependence on distance from the interface due to phonon interactions, using Green-function calculations.

Contribution

It provides a detailed numerical analysis of electron self-energy and effective mass in heterostructures considering interface and bulk phonon effects, which was not previously quantified.

Findings

Self energy increases with distance from interface.

Effective mass decreases as the electron moves away from the interface.

Results highlight the transition from interface to bulk polaron behavior.

Abstract

In this paper, we investigate the electron self-energy and effective mass in a single heterostructure using Green-function method. Numerical calculations of the electron self-energy and effective mass for GaAs/AlAs heterostructure are performed. The results show that the self energy (effective mass) of electron, which incorporate the energy of electron coupling to interface-optical phonons and half three-dimension LO phonons, monotonically increase(decrease) from that of interface polaron to that of 3D bulk polaron with the increase of the distance between the position of the electron and interface.