J. Phys. IV France
Volume 09, Numéro PR10, December 1999
International Workshop on Electronic Crystals
Page(s) Pr10-231 - Pr10-231
International Workshop on Electronic Crystals

J. Phys. IV France 09 (1999) Pr10-231-Pr10-231

DOI: 10.1051/jp4:19991058

Evidence for a threshold force for displacement transverse to current for 2-D Wigner solid in a disorder field

Perrucho1, Gaal1, B. Sas2, C. Mellor3, Harris4, Etienne, LMM, CNRS, Bagneux, France, Henini3 and T. Williams1

1  SPEC, CEA Saclay, France
2  Research Institute for Solid State Physics, Budapest, Hungary
3  University of Nottingham, U.K.
4  University of London, U.K.

Our measurements of the Hall effect in the sliding regime of the magnetically induced quantum Wigner solid at GaAs/GaAlAs heterojunction shows it to appear only beyond a threshold in current. This threshold is proportional to the threshold force required to induce sliding. It can be understood as a minimum Lorentz force for displacing the charge solid perpendicular to its current channels in the random field, as suggested theoretically for the superconductor vortex system by Giamarchi and Le Doussal.

© EDP Sciences 1999