J. Phys. IV France 09 (1999) Pr10-227-Pr10-229
Quantum fluctuations and unlocking of quantum Hall stripesH.A. Fertig1, 2 and R. Coté3
1 Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055, U.S.A.
2 Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106, U.S.A.
3 Université de Sherbrooke, Département de Physique, Sherbrooke, Québec, Canada J1K 2R1
Stripe ordering is believed to exist in quantum Hall systems in weak magnetic fields, where many Landau levels are occupied. Within mean-field theory such unidirectional CDW states are unstable to the formation of a set of parallel one-dimensional electron crystals that are locked into a two-dimensional crystal by their mutual interactions. Quantum fluctuations are shown to destabilize this state through a Kosterlitz-Thouless transition. The resulting state may be interpreted as a Wigner crystal with mobile vacancies and interstitials included in the groundstate. The expected transport properties are in qualitative agreement with recent experiments.
© EDP Sciences 1999