Electronic excitations in the bulk of fractional quantum Hall states

We analyze electronic excitations (excitations generated by adding or removing one electron) in the bulk of fractional quantum Hall states in Jain sequence states, using composite fermion Chern-Simons field theory. Starting from a mean field approximation in which gauge field fluctuations are neglected, we use symmetry to constrain the possible composite fermion states contributing to the electronic Green's function and expect discrete infinitely sharp peaks in the electronic spectral function. We further consider the electronic excitations in particle-hole conjugate fractional quantum Hall states. Gauge field fluctuations play an increasingly important role in the electron spectral function as the filling factor approaches 1/2, and evolve the discrete coherent peaks into a broad continuum even in the absence of impurities. At that limit, we calculate the dressed electron spectral function via the linked cluster approximation from the low to intermediate energy range. Finally, we compare our results with recent experiments.