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Эта публикация цитируется в 1 научной статье (всего в 1 статье)
Localization and quantum chaos
Quasiclassical memory effects: anomalous transport properties of two-dimensional electrons and composite fermions subject to a long-range disorder
F. Eversa, A. D. Mirlinabc, D. G. Polyakovbd, P. Wölfleab a Institut für Theorie der Kondensierten
Materie, Universität Karlsruhe, 76128 Karlsruhe, Germany
b Institut für Nanotechnologie, Forschungszentrum Karlsruhe, 76021 Karlsruhe, Germany
c Petersburg Nuclear Physics Institute, 188350 St. Petersburg,
Russian Federation
d A. F. Ioffe Physical-Technical Institute, 194021 St. Petersburg, Russian Federation
Аннотация:
We have studied the ac response and magnetoresistance of a two-dimensional electron gas in high-mobility samples in the presence of smooth disorder, with emphasis on the composite-fermion description of a half-filled Landau level. We have found that the low-$\omega$ behavior of the ac conductivity $\sigma(\omega)$ is governed by memory effects associated with return processes that are neglected in Boltzmann transport theory: the return-induced correction to $\mathrm{Re}\,\sigma$ exhibits a kink $\propto|\omega|$. It is shown that the non-Markovian quasiclassical kinetics leads to a strong magnetoresistance $\Delta\rho_{xx}$. We argue that the quasiclassical memory effects account for the positive $\Delta\rho_{xx}$ observed at small deviations from half-filling. At a larger deviation, the positive magnetoresistance is followed by a sharp falloff of $\rho_{xx}$.
Образец цитирования:
F. Evers, A. D. Mirlin, D. G. Polyakov, P. Wölfle, “Quasiclassical memory effects: anomalous transport properties of two-dimensional electrons and composite fermions subject to a long-range disorder”, УФН, 171, приложение к № 10 (2001), 27–31; Phys. Usp., 44:10 suppl. (2001), s27–s31
Образцы ссылок на эту страницу:
https://www.mathnet.ru/rus/ufn5623 https://www.mathnet.ru/rus/ufn/v171/i13/p27
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Страница аннотации: | 89 | PDF полного текста: | 38 |
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