One-dimensional Van Hove polaritons

TL;DR

This paper investigates how Van Hove singularities in 1D nanowires enable strong light-matter coupling and polariton formation without bound electron-hole states, broadening potential applications across various temperatures.

Contribution

It demonstrates that Van Hove singularities facilitate 1D polariton formation without the need for bound states, unlike traditional exciton polaritons.

Findings

Observation of anticrossing in absorption spectrum

Strong coupling achieved without bound electron-hole pairs

Polariton modes stable at various temperatures

Abstract

We study the light-matter coupling of microcavity photons and an interband transition in a one-dimensional (1D) nanowire. Due to the Van Hove singularity in the density of states, resulting in a resonant character of the absorption line, the achievement of strong coupling becomes possible even without the formation of a bound state of an electron and a hole. The calculated absorption in the system and corresponding energy spectrum reveal anticrossing behavior characteristic of the formation of polariton modes. In contrast to the case of conventional exciton polaritons, the formation of 1D Van Hove polaritons will not be restricted to low temperatures and can be realized in any system with a singularity in the density of states.