Magnetoresistance of a 2D electron gas caused by electron interactions in the transition from the diffusive to the ballistic regime
L. Li, Y. Y. Proskuryakov, A. K. Savchenko, E. H. Linfield, D. A. Ritchie
Abstract
On a high-mobility 2D electron gas we have observed, in strong magnetic fields (omegac tau > 1), a parabolic negative magnetoresistance caused by electron-electron interactions in the regime of kB T tau / hbar ~ 1, which is the transition from the diffusive to the ballistic regime. From the temperature dependence of this magnetoresistance the interaction correction to the conductivity delta sigmaxxee(T) is obtained in the situation of a long-range fluctuation potential and strong magnetic field. The results are compared with predictions of the new theory of interaction-induced magnetoresistance.
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