Phys. Rev. Lett. 90, 076802 (2003) [4 pages]Magnetoresistance of a 2D Electron Gas Caused by Electron Interactions in the Transition from the Diffusive to the Ballistic RegimeReceived 29 July 2002; published 18 February 2003 On a high-mobility 2D electron gas we have observed, in strong magnetic fields (ωcτ>1), a parabolic negative magnetoresistance caused by electron-electron interactions in the regime of kBTτ/ℏ∼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 δσxxee(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. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.90.076802
DOI:
10.1103/PhysRevLett.90.076802
PACS:
73.23.Ad, 71.30.+h, 73.40.Qv, 73.43.Qt
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