Xia, Jing and Cvicek, Vaclav and Eisenstein, J. P. and Pfeiffer, L. N. and West, K.W. (2010) Tilt-Induced Anisotropic to Isotropic Phase Transition at ν=5/2. Physical Review Letters, 105 (17). Art. No. 176807 . ISSN 0031-9007 http://resolver.caltech.edu/CaltechAUTHORS:20101109-090441714
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A modest in-plane magnetic field B_(∥) is sufficient to destroy the fractional quantized Hall states at ν=5/2 and 7/2 and replace them with anisotropic compressible phases. Remarkably, we find that at larger B_(∥) these anisotropic phases can themselves be replaced by isotropic compressible phases reminiscent of the composite fermion fluid at ν=1/2. We present strong evidence that this transition is a consequence of the mixing of Landau levels from different electric subbands. We also report surprising dependences of the energy gaps at ν=5/2 and 7/3 on the width of the confinement potential.
|Additional Information:||© 2010 The American Physical Society. Received 15 June 2010; published 22 October 2010. We thank Edward Rezayi for helpful discussions. This work was supported via Microsoft Project Q.|
|Classification Code:||PACS: 73.43.-f, 73.43.Nq, 73.21.Fg|
|Official Citation:||Xia, J., V. Cvicek, et al. (2010). "Tilt-Induced Anisotropic to Isotropic Phase Transition at nu =5/2." Physical Review Letters 105(17): 176807.|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||16 Nov 2010 19:36|
|Last Modified:||26 Dec 2012 12:36|
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