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Even-denominator fractional quantum Hall effect at a Landau level crossing

Author(s): Liu, Yang; Hasdemir, S; Kamburov, D; Graninger, AL; Shayegan, Mansour; et al

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Abstract: The fractional quantum Hall effect (FQHE), observed in two-dimensional (2D) charged particles at high magnetic fields, is one of the most fascinating, macroscopic manifestations of a many-body state stabilized by the strong Coulomb interaction. It occurs when the filling factor (ν) of the quantized Landau levels (LLs) is a fraction, which, with very few exceptions, has an odd denominator. In 2D systems with additional degrees of freedom it is possible to cause a crossing of the LLs at the Fermi level. At and near these crossings, the FQHE states are often weakened or destroyed. Here we report the observation of an unusual crossing of the two lowest-energy LLs in high-mobility GaAs 2D hole systems, which brings to life a new even-denominator FQHE at ν=1/2.
Publication Date: Apr-2014
Electronic Publication Date: 29-Apr-2014
Citation: Liu, Yang, Hasdemir, S, Kamburov, D, Graninger, AL, Shayegan, M, Pfeiffer, LN, West, KW, Baldwin, KW, Winkler, R. (2014). Even-denominator fractional quantum Hall effect at a Landau level crossing. Physical Review B, 89 (16), 10.1103/PhysRevB.89.165313
DOI: doi:10.1103/PhysRevB.89.165313
ISSN: 1098-0121
EISSN: 1550-235X
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B
Version: Author's manuscript

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