Photoluminescence fine structures in the fractional quantum Hall effect regime

Abstract

We investigate polarization-resolved fine structure in the photoluminescence (PL) in the fractional quantum Hall effect regime at $B=4$--6 T, where small Zeeman energy allows spin-depolarized ground states. We observe up to five distinct peaks with characteristic polarization and temperature dependence in the vicinity of $\ensuremath{\nu}=1/3$ and quenching of the PL from triplet charged quasiexcitons at around $\ensuremath{\nu}=1/4$. Those findings appear to be consistent with results of exact diagonalization on a Haldane sphere including all spin configurations and are understood to be PL from fractionally charged quasiexcitons.