MAGNETOPHONON SHAKEUP IN A WIGNER CRYSTAL - APPLICATIONS TO TUNNELING SPECTROSCOPY IN THE QUANTUM HALL REGIME

We calculate the tunnel current between two parallel two-dimensional electron systems in a strong perpendicular magnetic field. We model the strongly correlated electron systems by Wigner crystals, and describe their low-energy dynamics in terms of magnetophonons. A tunneling electron shakes up magnetophonons, which results in a conductance peak that is displaced away from zero voltage and broadened compared with the case of no magnetic field. Our results are in very good quantitative agreement with recent experiments.