Quasiparticle charge and the activated conductance of a quantum Hall liquid

We provide a theoretical basis for Clark s proposal that for quantum Hall liquids at magic filling factors, where the longitudinal conductivity is exponentially activated, xx=xx0eB-/kT, the prefactor xx0 is proportional to the square of the quasiparticle charge. We also propose that the same experiments uncover a remarkable law of corresponding states. © 1992 The American Physical Society.