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# Geometric Resonance of Composite Fermions near Bilayer Quantum Hall States

## Author(s): Mueed, MA; Kamburov, D; Pfeiffer, LN; West, KW; Baldwin, KW; et al

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 Abstract: Via the application of a parallel magnetic field, we induce a single-layer to bilayer transition in two-dimensional electron systems confined to wide GaAs quantum wells and study the geometric resonance of composite fermions (CFS) with a periodic density modulation in our samples. The measurements reveal that CFS exist close to bilayer quantum Hall states, formed at Landau level filling factors ν=1 and 1/2. Near ν=1, the geometric resonance features are consistent with half the total electron density in the bilayer system, implying that CFS prefer to stay in separate layers and exhibit a two-component behavior. In contrast, close to ν=1/2, CFS appear single-layer-like (single component) as their resonance features correspond to the total density. Publication Date: Dec-2016 Electronic Publication Date: 6-Dec-2016 Citation: Mueed, MA, Kamburov, D, Pfeiffer, LN, West, KW, Baldwin, KW, Shayegan, M. (2016). Geometric Resonance of Composite Fermions near Bilayer Quantum Hall States. Physical Review Letters, 117 (24), 10.1103/PhysRevLett.117.246801 DOI: doi:10.1103/PhysRevLett.117.246801 ISSN: 0031-9007 EISSN: 1079-7114 Type of Material: Journal Article Journal/Proceeding Title: Physical Review Letters Version: Author's manuscript

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