Quantisation of hopping magnetoresistance prefactor in strongly correlated two-dimensional electron systems

We report an universal behaviour of hopping transport in strongly interacting mesoscopic two-dimensional electron systems (2DES). In a certain window of background disorder, the resistivity at low perpendicular magnetic fields follows the expected relation View the MathML source. The prefactor ρB decreases exponentially with increasing electron density but saturates to a finite value at higher densities. Strikingly, this value is found to be universal when expressed in terms of absolute resistance and and shows quantisation at RB≈h/e2 and View the MathML source. We suggest a strongly correlated electronic phase as a possible explanation.