期刊
PHYSICAL REVIEW B
卷 92, 期 23, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.92.235105
关键词
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资金
- NSF [PHY-0756174]
- DOE Office of Basic Energy Sciences [DE-AC02-76SF00515]
- John Templeton Foundation
- CONICET
- PIP Grant [11220110100752]
- Stanford Graduate Fellowship
- Division Of Physics
- Direct For Mathematical & Physical Scien [1316699] Funding Source: National Science Foundation
We study the dynamics of the half-filled zeroth Landau level of Dirac fermions using mirror symmetry, a supersymmetric duality between certain pairs of 2 + 1-dimensional theories. We show that the half-filled zeroth Landau level of a pair of Dirac fermions is dual to a pair of Fermi surfaces of electrically neutral composite fermions, coupled to an emergent gauge field. Thus, we use supersymmetry to provide a derivation of flux attachment and the emergent Fermi-liquid-like state for the lowest Landau level of Dirac fermions. We find that in the dual theory the Coulomb interaction induces a dynamical exponent z = 2 for the emergent gauge field, making the interactions classically marginal. This enables us to map the problem of 2 + 1-dimensional Dirac fermions in a finite transverse magnetic field, interacting via a strong Coulomb interaction, into a perturbatively controlled model. We analyze the resulting low-energy theory using the renormalization group and determine the nature of the BCS interaction in the emergent composite Fermi liquid.
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