Electron liquids in the quantum Hall regimes support low-energy excitation modes that are linked to remarkable behaviors from fundamental interactions in two-dimensions. Inelastic light scattering methods offer unique experimental venues to access quasiparticle excitations in the charge and spin degrees of freedom. These experiments access directly low-lying quasiparticle excitations that express distinct quantum phases of the electron liquids. This research probes key properties such as the structure of quasiparticle energy levels and the low-lying excitations.
This talk presents an overview of recent light scattering results in the regime of the fractional quantum Hall effect.
The experiments reveal key features of energy vs. momentum dispersions of quasiparticle excitations, including evidence of translational symmetry, and of magnetoron minima. The excitations are probed in states of the liquid at filling factors that are between the major fractional quantum Hall states and thus provide insights on the phase transitions between quantum fluid states.