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Widely Tunable Quantum Phase Transition from Moore-Read to Composite Fermi Liquid in Bilayer Graphene

Journal Article · · Physical Review Letters
 [1];  [2];  [3]
  1. Harvard Univ., Cambridge, MA (United States); OSTI
  2. California State University, Northridge (CSUN), CA (United States)
  3. Max-Planck Institute for the Physics of Complex Systems, Dresden (Germany)
Here, we develop a proposal to realize a widely tunable and clean quantum phase transition in bilayer graphene between two paradigmatic fractionalized phases of matter: the Moore-Read fractional quantum Hall state and the composite Fermi liquid metal. This transition can be realized at total fillings $$\textit{ν}$$ = ±3 + 1/2 and the critical point can be controllably accessed by tuning either the interlayer electric bias or the perpendicular magnetic field values over a wide range of parameters. We study the transition numerically within a model that contains all leading single particle corrections to the band structure of bilayer graphene and includes the fluctuations between the $$\textit{n}$$ = 0 and $$\textit{n}$$ = 1 cyclotron orbitals of its zeroth Landau level to delineate the most favorable region of parameters to experimentally access this unconventional critical point. We also find evidence for a new anisotropic gapless phase stabilized near the level crossing of $$\textit{n}$$ = 0/1 orbits.
Research Organization:
California State University, Northridge (CSUN), CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
FG02-06ER46305
OSTI ID:
1800370
Alternate ID(s):
OSTI ID: 1603731
OSTI ID: 1864871
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 124; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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