Magnetoresistance of a 2D electron gas caused by electron interactions in the transition from the diffusive to the ballistic regime

Details Magnetoresistance of a 2D electron gas caused by electron interactions in the transition from the diffusive to the ballistic regime Magnetoresistance of a 2D electron gas caused by electron interactions in the transition from the diffusive to the ballistic regime

2002-07-27

arxiv.org/abs/cond-mat/0207662v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1103/PhysRevLett.90.076802

On a high-mobility 2D electron gas we have observed, in strong magnetic fields (omega_{c} tau > 1), a parabolic negative magnetoresistance caused by electron-electron interactions in the regime of k_{B} 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 sigma_{xx}^{ee}(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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