J. Phys. IV France 09 (1999) Pr10-231-Pr10-231
Evidence for a threshold force for displacement transverse to current for 2-D Wigner solid in a disorder fieldPerrucho1, 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