Quest for Order in Chaos: Hidden Repulsive Level Statistics in Disordered Quantum Nanoaggregates

TL;DR

This paper reveals that disordered quantum nano-aggregates exhibit Wigner-Dyson level spacing distributions, indicating level repulsion among overlapping exciton states, which impacts their functional properties.

Contribution

It provides experimental evidence of hidden level repulsion in disordered nano-aggregates through fluorescence spectroscopy, linking level statistics to nano-confined system behavior.

Findings

Wigner-Dyson level spacing distribution observed

Level repulsion confirmed in disordered molecular wires

Implications for understanding nano-confined systems

Abstract

The local distribution of exciton levels in disordered cyanine-dye-based molecular nano-aggregates has been elucidated using fluorescence line narrowing spectroscopy. The observation of a Wigner-Dyson-type level spacing distribution provides direct evidence of the existence of level repulsion of strongly overlapping states in the molecular wires, which is important for the understanding of the level statistics, and therefore the `functional properties, of a large variety of nano-confined systems.