Abstract
We report quantitative measurements of the impact of alloy disorder on the. nu = 5/2 fractional quantum Hall state. Alloy disorder is controlled by the aluminum content x in the AlxGa1-xAs channel of a quantum well. We find that the nu = 5/2 state is suppressed with alloy scattering. To our surprise, in samples with alloy disorder the nu = 5/2 state appears at significantly reduced mobilities when compared to samples in which alloy disorder is not the dominant scattering mechanism. Our results highlight the distinct roles of the different types of disorder present in these samples, such as the short-range alloy and the long-range Coulomb disorder.
Keywords
COMPOSITE FERMIONS, LANDAU-LEVEL, SCATTERING, CHARGE
DOI
10.1103/PhysRevLett.112.116804
Date of this Version
3-18-2014
Recommended Citation
Deng, Nianpei; Gardner, Geoff C.; Mondal, Sumit; Kleinbaum, Ethan; Manfra, Michael J.; and Csathy, Gabor, "nu=5/2 Fractional Quantum Hall State in the Presence of Alloy Disorder" (2014). Birck and NCN Publications. Paper 1570.
http://dx.doi.org/10.1103/PhysRevLett.112.116804
Comments
This is the publisher PDF of Deng, N; Gardner, GC; Mondal, S; Kleinbaum, D; Manfra, MJ; and Csathy, GA. "nu=5/2 Fractional Quantum Hall State in the Presence of Alloy Disorder." Physical Review Letters, 112, 116804. 2014. Copyright American Physical Society, it is available at http://dx.doi.org/10.1103/PhysRevLett.112.116804.