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Title: Even denominator fractional quantum Hall states in higher Landau levels of graphene

Journal Article · · Nature Physics
 [1];  [2];  [3]; ORCiD logo [3];  [4];  [1]
  1. Max Planck Inst. for Solid State Research, Stuttgart (Germany). Solid State Nanophysics
  2. Univ. of Copenhagen, Copenhagen (Denmark). Niels Bohr International Academy and the Center for Quantum Devices, Niels Bohr Inst.
  3. National Inst. for Material Science, Tsukuba (Japan)
  4. Pennsylvania State Univ., University Park, PA (United States). Dept. of Physics

A remarkable development in the field of the fractional quantum Hall effect has been the proposal that the 5/2 state observed in the Landau level with orbital index n = 1 of two- dimensional electrons in a GaAs quantum well originates from a chiral p-wave paired state of composite fermions which are topological bound states of electrons and quantized vortices. This state is theoretically described by a “Pfaffian” wave function or its hole partner called the anti-Pfaffian, whose excitations are neither fermions nor bosons but Majorana quasiparticles obeying non-Abelian braid statistics. Here, this has inspired innovative ideas on fault-tolerant topological quantum computation and has also instigated a quest for other states with exotic quasi- particles. Here we report experiments on monolayer graphene that show clear evidence for unexpected even-denominator fractional quantum Hall physics in the n = 3 Landau level. We numerically investigate the known candidate states for even-denominator fractional quantum Hall effect, including the Pfaffian, the particle-hole symmetric Pfaffian, the 221-parton, and several valley / spin singlet states, and conclude that, among these, the 221-parton state is the most plausible candidate to explain the experimentally observed state. Like the Pfaffian, this state is also believed to harbour quasi-particles with non-Abelian braid statistics.

Research Organization:
Pennsylvania State Univ., University Park, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0005042
OSTI ID:
1489119
Journal Information:
Nature Physics, Vol. 15, Issue 2; ISSN 1745-2473
Publisher:
Nature Publishing Group (NPG)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 51 works
Citation information provided by
Web of Science

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Cited By (14)

Nanoscale imaging of equilibrium quantum Hall edge currents and of the magnetic monopole response in graphene journal December 2019
2D materials for quantum information science journal August 2019
Topological characterization of hierarchical fractional quantum Hall effects in topological flat bands with SU( N ) symmetry journal August 2019
Identification of topological order in the fractional quantum Hall state at ν = 1 / 4 journal November 2019
Parton construction of particle-hole-conjugate Read-Rezayi parafermion fractional quantum Hall states and beyond journal June 2019
High-Quality Magnetotransport in Graphene Using the Edge-Free Corbino Geometry journal April 2019
Prediction of a Non-Abelian Fractional Quantum Hall State with f -Wave Pairing of Composite Fermions in Wide Quantum Wells journal July 2019
Parton construction of particle-hole-conjugate Read-Rezayi parafermion fractional quantum Hall states and beyond text January 2019
Prediction of a non-Abelian fractional quantum Hall state with $f$-wave pairing of composite fermions in wide quantum wells text January 2019
Nanoscale imaging of equilibrium quantum Hall edge currents and of the magnetic monopole response in graphene text January 2019
Spectroscopic Signatures of Electronic Excitations in Raman Scattering in Thin Films of Rhombohedral Graphite journal July 2019
A non-Abelian parton state for the $ν=2+3/8$ fractional quantum Hall effect text January 2020
Thirty Years of Composite Fermions and Beyond text January 2020
The Half-Full Landau Level text January 2020

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