期刊
SCIENCE
卷 352, 期 6282, 页码 197-201出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aad4302
关键词
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资金
- National Science Engineering Research Council of Canada
- U.S. Department of Energy BES [de-sc0002140]
- Sherman Fairchild Foundation
- U.S. Army Research Office [W911NF-14-1-0379]
- Simons Investigator Award
- NSF [PHY11-25915, DMR 1206096]
- Caltech Institute for Quantum Information and Matter
- NSF Physics Frontiers Center
- U.S. Department of Energy (DOE) [DE-SC0002140] Funding Source: U.S. Department of Energy (DOE)
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1206096] Funding Source: National Science Foundation
In a two-dimensional electron gas under a strong magnetic field, correlations generate emergent excitations distinct from electrons. It has been predicted that composite fermions-bound states of an electron with two magnetic flux quanta-can experience zero net magnetic field and form a Fermi sea. Using infinite-cylinder density matrix renormalization group numerical simulations, we verify the existence of this exotic Fermi sea, but find that the phase exhibits particle-hole symmetry. This is self-consistent only if composite fermions are massless Dirac particles, similar to the surface of a topological insulator. Exploiting this analogy, we observe the suppression of 2kF backscattering, a characteristic of Dirac particles. Thus, the phenomenology of Dirac fermions is also relevant to two-dimensional electron gases in the quantum Hall regime.
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