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

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 $2/5\ge \nu \ge 1/3$, 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.

7 pages, 7 figures

References in corpus (7)

• Fractional Quantum Hall Effect of Composite Fermions
• Transition from an electron solid to the sequence of fractional quantum Hall states at very low Landau level filling factor
• Possible Pairing-Induced Even-Denominator Fractional Quantum Hall Effect in the Lowest Landau Level
• Evidence of Landau levels and interactions in low-lying excitations of composite fermions at 1/3 <= ν<= 2/5
• Partially spin polarized quantum Hall effect in the filling factor range 1/3 < nu < 2/5
• Light scattering observations of spin reversal excitations in the fractional quantum Hall regime
• Activation energies for spin-reversed excitations in the fractional quantum Hall effect