Probing quantum-mechanical level repulsion in disordered systems by means of time-resolved selectively-excited resonance fluorescence

TL;DR

This paper proposes a novel spectroscopic method to investigate quantum level repulsion in disordered materials by analyzing time-resolved resonance fluorescence, demonstrated through simulations on exciton chains.

Contribution

It introduces a new technique using time-resolved resonance fluorescence to probe quantum level repulsion in disordered systems, supported by simulation results.

Findings

Detection of fast growth of red-shifted fluorescence peak.

Effective probing of quantum level repulsion in disordered materials.

Simulation validation on Frenkel exciton chains.

Abstract

We argue that the time-resolved spectrum of selectively-excited resonance fluorescence at low temperature provides a tool for probing the quantum-mechanical level repulsion in the Lifshits tail of the electronic density of states in a wide variety of disordered materials. The technique, based on detecting the fast growth of a fluorescence peak that is red-shifted relative to the excitation frequency, is demonstrated explicitly by simulations on linear Frenkel exciton chains.