期刊
PHYSICAL REVIEW LETTERS
卷 107, 期 10, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.106402
关键词
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资金
- MEC (Spain) [FIS2008-00124, PIB2010BZ-00512]
- NSF [DMR-1005035]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1005035] Funding Source: National Science Foundation
We propose a simple method for obtaining time reversal symmetry (T) broken phases in simple lattice models based on enlarging the unit cell. As an example we study the honeycomb lattice with nearest neighbor hopping and a local nearest neighbor Coulomb interaction V. We show that when the unit cell is enlarged to host six atoms that permits Kekule distortions, self-consistent currents spontaneously form creating nontrivial magnetic configurations with total zero flux at high electron densities. A very rich phase diagram is obtained within a variational mean field approach that includes metallic phases with broken time reversal symmetry (T). The predominant (T) breaking configuration is an anomalous Hall phase, a realization of a topological Fermi liquid.
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