Crossover and Coexistence of Quasiparticle Excitations in the Fractional Quantum Hall Regime at nu <= 1/3
31 October 2003
New low-lying excitations are observed by inelastic light scattering at filling factors nu = p/(phi*p+-1) of the fractional quantum Hall regime with phi = 4. Coexisting with these modes throughout the range nu= 1/3 are phi = 2 excitations seen at 1/3. Both phi = 2 and phi = 4 excitations have distinct behaviors with temperature and filling factor. The abrupt first appearance of the new modes in the low energy excitation spectrum at nu