nu=5/2 Fractional Quantum Hall State in the Presence of Alloy Disorder

Nianpei Deng, Purdue University
Geoff C. Gardner, Purdue University, Birck Nanotechnology Center
Sumit Mondal, Purdue University, Birck Nanotechnology Center
Ethan Kleinbaum, Purdue University
Michael J. Manfra, Purdue University, Birck Nanotechnology Center
Gabor Csathy, Purdue University, Birck Nanotechnology Center

Date of this Version

3-18-2014

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.

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.

Discipline(s)

Nanoscience and Nanotechnology

 

Share