Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-05-31
Phys. Rev. Lett. 100, 106806 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
4+ pages, 3 figures
Scientific paper
10.1103/PhysRevLett.100.106806
We study the magnetoresistance, \delta\rho_{xx}(B)/\rho_0, of a high-mobility 2D electron gas in the domain of magnetic fields, B, intermediate between the weak localization and the Shubnikov-de Haas oscillations, where \delta\rho_{xx}(B)/\rho_0 is governed by the interaction effects. Assuming short-range impurity scattering, we demonstrate that in the {\em second order} in the interaction parameter, $\lambda$, a {\em linear} B-dependence, \delta\rho_{xx}(B)/\rho_0\sim \lambda^2\omega_c/E_F with {\em temperature-independent} slope emerges in this domain of B (here \omega_c and E_F are the cyclotron frequency and the Fermi energy, respectively). Unlike previous mechanisms, the linear magnetoresistance is {\em unrelated} to the electron executing the full Larmour circle, but rather originates from the impurity scattering via the B-dependence of the {\em phase} of the impurity-induced Friedel oscillations.
Raikh Mikhail E.
Sedrakyan Tigran A.
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