Large positive magneto-resistance in high mobility 2D electron gas : interplay of short and long range disorder
Résumé
We have observed a large positive quasi-classicalmagneto-resistance (MR) in a high mobility 2D electron gas inAlGaAs/GaAs heterostructure. The magneto-resistance isnon-saturating and increases with magnetic field as $\rho_{xx}\simB^{\alpha} (\alpha=0.9-1.2)$. In antidot lattices a non-monotonicMR is observed. We show that in both cases this MR can bequalitatively described in terms of the theory recently advancedby Polyakov et al (PRB, 64, 205306 (2001)).Their prediction is that such behavior as we observe may be theconsequence of a concurrent existence of short and long rangescattering potentials.
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