An Anderson-Fano Resonance and Shake-Up Processes in the Magneto-Photoluminescence of a Two-Dimensional Electron System

TL;DR

This paper investigates anomalous features in magneto-photoluminescence spectra of a 2D electron system, revealing many-body effects and resonance phenomena influenced by magnetic field and temperature.

Contribution

It provides experimental evidence of Anderson-Fano resonance and shake-up processes in 2D electron systems, supported by theoretical analysis.

Findings

Doublet structure shifts with magnetic field

Satellite peak varies with magnetic field

Features depend on temperature and magnetic field

Abstract

We report an anomalous doublet structure and low-energy satellite in the magneto-photoluminescence spectra of a two-dimensional electron system. The doublet structure moves to higher energy with increasing magnetic field and is most prominent at odd filling factors 5 and 3. The lower-energy satellite peak tunes to lower energy for increasing magnetic field between filling factor 6 and 2. These features occur at energies below the fundamental band of recombination originating from the lowest Landau level and display striking magnetic field and temperature dependence that indicates a many-body origin. Drawing on a recent theoretical description of Hawrylak and Potemski, we show that distinct mechanisms are responsible for each feature.