Evidence for an Anisotropic State of Two-Dimensional Electrons in High Landau Levels

Details Evidence for an Anisotropic State of Two-Dimensional Electrons in High Landau Levels Evidence for an Anisotropic State of Two-Dimensional Electrons in High Landau Levels

1998-08-20

arxiv.org/abs/cond-mat/9808227v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages with 5 figures, to be published in Phys. Rev. Letters, new figure added (Fig. 4)

Scientific paper

10.1103/PhysRevLett.82.394

Magneto-transport experiments on high mobility two-dimensional electron gases in GaAs/AlGaAs heterostructures have revealed striking anomalies near half-filling of several spin-resolved, yet highly excited, Landau levels. These anomalies include strong anisotropies and non-linearities of the longitudinal resistivity rho_xx which commence only below about 150mK. These phenomena are not seen in the ground or first excited Landau level but begin abruptly in the third level. Although their origin remains unclear, we speculate that they reflect the spontaneous development of a generic anisotropic many-electron state.

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