Origin of the ν=1/2 fractional quantum Hall state in wide single quantum wells

Y. W. Suen, H. C. Manoharan, X. Ying, M. B. Santos, and M. Shayegan
Phys. Rev. Lett. 72, 3405 – Published 23 May 1994
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Abstract

We study the effect of subband energy separation and asymmetry on the quasiparticle excitation gaps of the ν=1/2 and coexisting fractional quantum Hall (FQH) states in wide single quantum wells. A new even-denominator FQH state at ν=3/2 and a dramatic subband-mixing-driven phase transition from a one- to two-component FQH state at ν=2/3 are observed. Our results reveal the two-component origin of the ν=1/2 FQH state, and allow us to construct an experimental phase diagram for electron states at half filling.

  • Received 6 January 1994

DOI:https://doi.org/10.1103/PhysRevLett.72.3405

©1994 American Physical Society

Authors & Affiliations

Y. W. Suen, H. C. Manoharan, X. Ying, M. B. Santos, and M. Shayegan

  • Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544

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Vol. 72, Iss. 21 — 23 May 1994

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