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Article overview
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Crossover from weak localization to the Shubnikov-de Haas oscillations
in a high mobility 2D electron gas | | T. A. Sedrakyan
; M. E. Raikh
; | | Date: |
31 May 2007 | | Subject: | Mesoscopic Systems and Quantum Hall Effect (cond-mat.mes-hall) | | Abstract: | Electron-electron interactions give rise to the correction,
deltasigma_{xx}(B), to the weak-field magnetoconductivity 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. This correction
emerges in the second order in the interaction parameter. It is quadratic in B
in weak fields and crosses over to the novel linear in B behavior with
increasing B. In the ballistic regime, deltasigma_{xx}(B) acquires the
temperature dependence propto B^2T^{-3/2} at low B. The linear in B region of
deltasigma_{xx} as well as of magnetoresistance, delta
ho_{xx}(B), is
T-independent. Anomalous sensitivity of delta
ho_{xx} to magnetic field is
traced to the B-dependence of the phase of the impurity-induced Friedel
oscillations. | | Source: | arXiv, arxiv.0705.4486 | | Services: | Forum | Review | PDF | Favorites | |
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