Instability toward biexciton crystallization in one-dimensional electron-hole systems

TL;DR

This paper investigates high-density 1D electron-hole systems and finds they remain insulating with a strong tendency to form biexciton crystals, defying the expected Mott transition at zero temperature.

Contribution

It reveals that 1D electron-hole systems are inherently insulating and unstable towards biexciton crystallization, challenging previous assumptions about the Mott transition.

Findings

Systems are insulating even at high densities

No Mott transition occurs at zero temperature

Strong instability towards biexciton crystallization

Abstract

One-dimensional (1D) electron-hole (e-h) systems in a high-density regime is investigated by means of bozonization techniques. It turned out that the systems are insulating even at the high density limit and that the exciton Mott transition (insulator-to-metal transition) never occurs at absolute zero temperature. The insulating ground state exhibits a strong instability towards the crystallization of biexcitons.