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APS March Meeting 2019

Volume 64, Number 2

Monday–Friday, March 4–8, 2019; Boston, Massachusetts

Session R01: Fractional Quantum Hall Effect: Novel States

8:00 AM–11:00 AM, Thursday, March 7, 2019
BCEC Room: 106

Sponsoring Unit: DCMP
Chair: Ravindra Bhatt, Princeton University

Abstract: R01.00011 : Composite fermions with quenched disorder at the half-filled Landau level*

10:00 AM–10:12 AM

The gapless state at the half-filled Landau level is approximately described in terms of nearly-free composite fermions. Within the mean-field approximation, it has recently been shown that the composite fermions describe a quantum phase transition between an insulator and an integer quantum Hall state when the effects of a quenched disorder are included. Here, we further characterize this random quantum critical point using the non-linear sigma model and network model approaches to disordered fermions.

*DOE Office of Basic Energy Sciences, contract DEAC02- 76SF00515

Presentation