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Evidence for an anisotropic state of two-dimensional electrons in high Landau levels

Lilly, M. P. and Cooper, K. B. and Eisenstein, J. P. and Pfeiffer, L. N. and West, K. W. (1999) Evidence for an anisotropic state of two-dimensional electrons in high Landau levels. Physical Review Letters, 82 (2). pp. 394-397. ISSN 0031-9007. doi:10.1103/PhysRevLett.82.394.

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Magnetotransport 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 nonlinearities of the longitudinal resistivity ρxx which commence only below about 150 mK. These phenomena are not seen in the ground state 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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Additional Information:© 1999 The American Physical Society. Received 19 August 1998. We thank J. Chalker, S.M. Girvin, B. Halperin, A.H. MacDonald, and K. Yang for helpful discussions and Ian Spielman for help in determining the crystallographic axes in our samples. This work was supported by the National Science Foundation.
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ID Code:6569
Deposited By: Tony Diaz
Deposited On:13 Dec 2006
Last Modified:08 Nov 2021 20:35

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