Spin Transition in the ν=8/3 Fractional Quantum Hall Effect

2012/04/02 by W. Pan, K. W. Baldwin, Pan, W. +7
Computer Science · Physics and Astronomy · #Quantum Information and Cryptography #Quantum and electron transport phenomena #Topological Materials and Phenomena #cond-mat.mes-hall #cond-mat.str-el

paper · pdf · doi:10.48550/arxiv.1204.0557

Accepted for publication in Phys. Rev. Lett

arxiv created 2012/04/02 · arxiv updated 2012/04/04

Abstract

We present here the results from a density dependent study of the activation energy gaps of the fractional quantum Hall effect states at Landau level fillings ν=8/3 and 7/3 in a series of high quality quantum wells. In the density range from 0.5 x 10¹¹ to 3 x 10¹¹ cm^-2, the 7/3 energy gap increases monotonically with increasing density, supporting its ground state being spin polarized. For the 8/3 state, however, its energy gap first decreases with increasing density, almost vanishes at n ~ 0.8 x 10¹¹ cm^-2, and then turns around and increases with increasing density, clearly demonstrating a spin transition.

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