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An investigation of orientational symmetry-breaking mechanisms in high Landau levels

Cooper, K. B. and Lilly, M. P. and Eisenstein, J. P. and Jungwirth, T. and Pfeiffer, L. N. and West, K. W. (2001) An investigation of orientational symmetry-breaking mechanisms in high Landau levels. Solid State Communications, 119 (2). pp. 89-94. ISSN 0038-1098.

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The principal axes of the recently discovered anisotropic phases of 2D electron systems at high Landau level occupancy are consistently oriented relative to the crystal axes of the host semiconductor. The nature of the native rotational symmetry breaking field responsible for this preferential orientation remains unknown. Here we report on experiments designed to investigate the origin and magnitude of this symmetry breaking field. Our results suggest that neither micron-scale surface roughness features nor the precise symmetry of the quantum well potential confining the 2D system are important factors. By combining tilted field transport measurements with detailed self-consistent calculations we estimate that the native anisotropy energy, whatever its origin, is typically ∼1 mK per electron.

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Additional Information:© 2001 Elsevier Science Ltd. Received 26 April 2001, Accepted 7 May 2001, Available online 19 June 2001. We thank M. Roukes for his generous loan of the atomic force microscope used in this work, E. Rashba for pointing out Ref. 30 to us, R. Willett for showing us his data prior to publication, and S. Das Sarma and A.C. Gossard for helpful discussions. This work is supported by the NSF under grant DMR-0070890, the DOE under grant DE-FG03-99ER45766, and the Grant Agency of the Czech Republic under grant 202/01/0754.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG03-99ER45766
Grant Agency of the Czech Republic202/01/0754
Subject Keywords:D. Quantum Hall effect; D. Electronic transport; C. Crystal structure and symmetry
Issue or Number:2
Classification Code:PACS: 73.20.Dx; 73.40.Kp; 73.50.Jt
Record Number:CaltechAUTHORS:20190521-091750235
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Official Citation:K.B. Cooper, M.P. Lilly, J.P. Eisenstein, T. Jungwirth, L.N. Pfeiffer, K.W. West, An investigation of orientational symmetry-breaking mechanisms in high Landau levels, Solid State Communications, Volume 119, Issue 2, 2001, Pages 89-94, ISSN 0038-1098, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:95632
Deposited By: Tony Diaz
Deposited On:21 May 2019 17:46
Last Modified:03 Oct 2019 21:15

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