J. Phys. IV France 12 (2002) Pr9-329
Transverse depinning threshold revealed by non linear Hall effect of Wigner solid in a disorder fieldF.I.B. Williams1, F. Perruchot1, B. Etienne2, C.J. Mellor3, R. Gaal1, B. Sas4, M. Hannini3, T. Foxon3 and J. Harris5
1 CEA-Saclay, France
2 CNRS, France
3 University of Nottingham, U.K.
4 SzFKI Budapest, Hungary
5 Imperial College, University of London, U.K.
Both electrons and holes at a GaAs/GaAlAs heterojunction show a non linear Hall effect as a function of current in the magnetically induced Wigner solid phase. Arguing that this arises from a threshold Lorentz force transverse to the current lines, this threshold is found to be proportional to the longitudinal depinning threshold and about 10% of its value. This is to be compared with theoretical predictions by Giamarchi and LeDoussal and with numerical simulation results (Moon, Scalettar and Zimanyi).
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