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.