Quasiexcitons in Incompressible Quantum Liquids

TL;DR

This paper explains anomalies in photoluminescence observed in fractional quantum Hall systems by proposing that emission originates from quasiexciton states formed from trions and correlated electrons, revealing new insights into electron-liquid interactions.

Contribution

It introduces the concept of quasiexcitons formed from trions and correlated electrons as the origin of PL anomalies in incompressible quantum liquids, providing a new theoretical framework.

Findings

PL emission involves fractionally charged quasiexcitons

Binding and recombination depend on electron liquid and trion states

Predicts discontinuities in PL and sensitivity to sample parameters

Abstract

Photoluminescence (PL) has been used to study two-dimensional incompressible electron liquids in high magnetic fields for nearly two decades. However, some of the observed anomalies coincident with the fractional quantum Hall effect are still unexplained. We show that emission in these systems occurs from fractionally charged "quasiexciton" states formed from trions correlated with the surrounding electrons. Their binding and recombination depend on the state of both the electron liquid and the involved trion, predicting discontinuities in PL and sensitivity to sample parameters.