Abstract
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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