@article{6f6e997e519440d4b788b64b8fea8d6b,
title = "Direct Observation of Composite Fermions and Their Fully-Spin-Polarized Fermi Sea near ν=5 /2",
abstract = "The enigmatic even-denominator fractional quantum Hall state at Landau level filling factor ν=5/2 is arguably the most promising candidate for harboring Majorana quasiparticles with non-Abelian statistics and, thus, of potential use for topological quantum computing. The theoretical description of the ν=5/2 state is generally believed to involve a topological p-wave pairing of fully-spin-polarized composite fermions through their condensation into a non-Abelian Moore-Read Pfaffian state. There is, however, no direct and conclusive experimental evidence for the existence of composite fermions near ν=5/2 or for an underlying fully-spin-polarized Fermi sea. Here, we report the observation of composite fermions very near ν=5/2 through geometric resonance measurements and find that the measured Fermi wave vector provides direct demonstration of a Fermi sea with full spin polarization. This lends crucial credence to the model of 5/2 fractional quantum Hall effect as a topological p-wave paired state of composite fermions.",
author = "Hossain, {Md Shafayat} and Ma, {Meng K.} and Mueed, {M. A.} and Pfeiffer, {L. N.} and West, {K. W.} and Baldwin, {K. W.} and M. Shayegan",
note = "Funding Information: We acknowledge support through the National Science Foundation (Grants No. DMR 1709076 and No. ECCS 1508925) for measurements, and the National Science Foundation (Grant No. MRSEC DMR 1420541), the U.S. Department of Energy Basic Energy Sciences (Grant No. DE-FG02-00-ER45841), and the Gordon and Betty Moore Foundation (Grant No. GBMF4420 for sample fabrication and characterization. This research is funded in part by QuantEmX grants from Institute for Complex Adaptive Matter and the Gordon and Betty Moore Foundation through Grant No. GBMF5305 to M. S. H., M. K. M., and M. S. Our measurements were partly performed at the National High Magnetic Field Laboratory (NHMFL), which is supported by the National Science Foundation Cooperative Agreement No. DMR 1157490, by the State of Florida, and the U.S. Department of Energy. We thank S. Hannahs, T. Murphy, H. Baek, J. Park, and G. Jones at NHMFL for technical support. We also thank J. K. Jain for illuminating discussions. Publisher Copyright: {\textcopyright} 2018 American Physical Society.",
year = "2018",
month = jun,
day = "20",
doi = "10.1103/PhysRevLett.120.256601",
language = "English (US)",
volume = "120",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "25",
}