期刊
PHYSICAL REVIEW LETTERS
卷 121, 期 2, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.121.026603
关键词
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资金
- Army Research Office [W911NF-16-1-0482]
- University of Maryland
- NSF-Joint Quantum Institute-Physics Frontier Center
- NSF CAREER [DMR-1753240]
- National Science Foundation [NSF PHY-1125915]
- EPSRC [EP/P009409/1]
- EPSRC [EP/P009409/1] Funding Source: UKRI
Awide variety of two-dimensional electron systems allow for independent control of the total and relative charge density of two-component fractional quantum Hall (FQH) states. In particular, a recent experiment on bilayer graphene (BLG) observed a continuous transition between a compressible and incompressible phase at total filling V-T = 1/2 as charge is transferred between the layers, with the remarkable property that the incompressible phase has a finite interlayer polarizability. We argue that this occurs because the topological order of V-T = 1/2 systems supports a novel type of interlayer exciton that carries Fermi statistics. If the fermionic excitons are lower in energy than the conventional bosonic excitons (i.e., electron-hole pairs), they can form an emergent neutral Fermi surface, providing a possible explanation of an incompressible yet polarizable state at V-T = 1/2. We perform exact diagonalization studies that demonstrate that fermionic excitons are indeed lower in energy than bosonic excitons. This suggests that a topological exciton metal hidden inside a FQH insulator may have been realized experimentally in BLG. We discuss several detection schemes by which the topological exciton metal can be experimentally probed.
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