Light Scattering by Low Lying Quasiparticle Excitations in the Fractional Quantum Hall Regime

TL;DR

This study uses resonant inelastic light scattering to investigate low-energy excitations in fractional quantum Hall states, revealing insights into quasiparticle behavior and spin configurations in various filling factor regimes.

Contribution

It provides new experimental evidence on spin-split composite fermion quasiparticles and their excitations in the fractional quantum Hall regime.

Findings

Evidence of spin-split composite fermion quasi-Landau levels at 2/5 to 1/3

Observation of well-defined excitations at 4/3 and 8/5

Insights into spin polarization states around ν=3/2

Abstract

Low lying excitations of electron liquids in the fractional quantum Hall (FQH) regime are studied by resonant inelastic light scattering methods. We present here results from charge and spin excitations of FQH states in the lowest spin-split Landau levels that are of current interest. In the range of filling factors $2/5 \geq \nu \geq 1/3$, we find evidence that low energy quasiparticle excitations can be interpreted with spin-split composite fermion quasi-Landau levels. At FQH states around $\nu=3/2$, we find well-defined excitations at 4/3 and 8/5 that are consistent with a spin-unpolarized population of quasi-Landau levels.