Two-dimensional collective electron magnetotransport, oscillations, and chaos in a semiconductor superlattice

Magnetotransport measurements on freely suspended two-dimensional electron gases

R. H. Blick,1,* F. G. Monzon, W. Wegscheider, M. Bichler, F. Stern, and M. L. Roukes Condensed Matter Physics 114-36, California Institute of Technology, Pasadena, California 91125 Walter-Schottky-Institut der Technischen Universität München, Am Coulombwall, 85748 Garching, Germany IBM T.J. Watson Research Center, P.O. Box 218, Yorktown Heights, New York 10598 ~Received 10 April 2000; revised m...

Resonances and Chaos in the Collective Oscillations of a

We investigate the collective oscillations of a Bose condensate in an anisotropic harmonic trap. We analytically calculate the values of the trap deformation for which the normal modes are in resonance. In presence of low-order resonances, the amplitude dependence of frequencies is strongly enhanced. We also study the transition to chaos of the collective modes as a function of the trap anisotr...

Magnetoresistance quantum oscillations in a magnetic two-dimensional electron gas

J. Kunc,1,2,* B. A. Piot,1 D. K. Maude,1 M. Potemski,1 R. Grill,2 C. Betthausen,3 D. Weiss,3 V. Kolkovsky,4 G. Karczewski,4 and T. Wojtowicz4 1Laboratoire National des Champs Magnétiques Intenses (LNCMI), CNRS-UJF-UPS-INSA, 38042 Grenoble, France 2Institute of Physics, Faculty of Mathematics and Physics, 12116 Prague, Czech Republic 3Experimentelle und Angewandte Physik, Universität Regensburg,...

Relation between low-temperature quantum and high-temperature classical magnetotransport in a two-dimensional electron gas.

Magnetotransport in a two-dimensional electron gas at large filling factors

We derive the quantum Boltzmann equation for the two-dimensional electron gas in a magnetic field such that the filling factor n@1. This equation describes all of the effects of the external fields on the impurity collision integral including Shubnikov–de Haas oscillations, the smooth part of the magnetoresistance, and nonlinear transport. Furthermore, we obtain quantitative results for the eff...