Fano resonances in optical spectra of semiconductor quantum wells driven by an oscillating field

TL;DR

This paper theoretically investigates how off-resonant oscillating fields induce Fano resonances in the optical spectra of semiconductor quantum wells by creating quasi-stationary electron states through dynamical stabilization.

Contribution

It introduces a theoretical model showing how oscillating fields generate quasi-stationary states and Fano resonances in quantum well optical spectra, highlighting a new mechanism for spectral features.

Findings

Fano resonances appear near energies of quasi-stationary states.

Oscillating fields induce dynamical stabilization of electron states.

Quasi-stationary states are confined at repulsive scatterers.

Abstract

Optical spectra of semiconductor quantum wells driven by an off-resonant oscillating field are studied theoretically. Due to the dynamical stabilization effect, the field induces the quasi-stationary electron states confined at repulsive scatterers and immersed into the continuum of states of conduction electrons. As a result, the Fano resonances in the spectra of interband optical transitions appear near the energies of the quasi-stationary states.