Shake-up Processes in Intersubband Magneto-photoabsorption of a Two-Dimensional Electron Gas

TL;DR

This paper extends the theoretical understanding of shake-up processes in the photoabsorption of a two-dimensional electron gas under magnetic fields, focusing on combined exciton-cyclotron resonance and higher Landau level excitations.

Contribution

It generalizes existing high-field ExCR theory to include hole excitations to higher Landau levels, incorporating Coulomb correlations and selection rules.

Findings

Theoretical framework for higher hole Landau level excitations in ExCR.

Predictions of high-field features of ExCR with generalized conditions.

Enhanced understanding of Coulomb correlation effects in 2DEG photoabsorption.

Abstract

I theoretically study shake-up processes in photoabsorption of an interacting low-density two-dimensional electron gas (2DEG) in magnetic fields. Such processes, in which an incident photon creates an electron-hole pair and simultaneously excites one electron to one of the higher Landau levels, were observed experimentally [D.R. Yakovlev et al., Phys. Rev. Lett. 79, 3974 (1997)] and were called combined exciton-cyclotron resonance (ExCR). The recently developed theory of ExCR [A.B. Dzyubenko, Phys. Rev. B 64, 241101 (2001)] allows for a consistent treatment of the Coulomb correlations, establishes the exact ExCR selection rules, and predicts the high field features of ExCR. In this work, I generalize the existing theory of high-field ExCR in the 2DEG to the case when the hole is excited to higher hole Landau levels.