Ultrafast Coherent Spectroscopy of the Fermi Edge Singularity

TL;DR

This paper provides a theoretical analysis of the ultrafast coherent response of the Fermi Edge Singularity in quantum wells, focusing on linear and nonlinear optical responses using bosonization.

Contribution

It introduces a bosonization-based theoretical framework to describe the transient optical response of FES in quantum wells under ultrafast excitation.

Findings

Long-time nonlinear response resembles the linear response.

Calculated FWM signal matches experimental expectations.

Theoretical model captures both linear and nonlinear dynamics.

Abstract

In this work we present a theoretical description of the transient response of the Fermi Edge Singularity (FES). We study the linear and the nonlinear response of an n-doped QW to laser pulses in the Coherent Control (CC) and Four Wave Mixing (FWM) Configurations. By means of a bosonization formalism we calculate the FWM signal emitted by the sample when it is excited by pulses spectrally peaked around the FES and we show that the long time behavior of the nonlinear signal is very similar to the linear case.