New Physics in High Landau Levels

Details New Physics in High Landau Levels New Physics in High Landau Levels

1999-09-16

arxiv.org/abs/cond-mat/9909238v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

8 pages, 9 figures. To be published in the Proceedings of the 13th International Conference on the Electronic Properties of Tw

Scientific paper

10.1016/S1386-9477(99)00043-0

Recent magneto-transport experiments on ultra-high mobility 2D electron systems in GaAs/AlGaAs heterostructures have revealed the existence of whole new classes of correlated many-electron states in highly excited Landau levels. These new states, which appear only at extremely low temperatures, are distinctly different from the familiar fractional quantum Hall liquids of the lowest Landau level. Prominent among the recent findings are the discoveries of giant anisotropies in the resistivity near half filling of the third and higher Landau levels and the observation of re- entrant integer quantum Hall states in the flanks of these same levels. This contribution will survey the present status of this emerging field.

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