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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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