期刊
NEW JOURNAL OF PHYSICS
卷 15, 期 -, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/15/1/013025
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资金
- FRS-FNRS (Belgium)
- DARPA
- Emergences program (Ville de Paris and UPMC)
- Carnegie Trust for the Universities of Scotland
- EPSRC
- ERC
- European Social Fund under the Global Grant measure
- NSF through the Physics Frontier Center
- ARO
- Atomtronics MURI
- DARPA OLE Program
- Direct For Mathematical & Physical Scien
- Division Of Physics [822671] Funding Source: National Science Foundation
- Engineering and Physical Sciences Research Council [EP/J001392/1] Funding Source: researchfish
- EPSRC [EP/J001392/1] Funding Source: UKRI
Ultracold fermions trapped in a honeycomb optical lattice constitute a versatile setup to experimentally realize the Haldane model (1988 Phys. Rev. Lett. 61 2015). In this system, a non-uniform synthetic magnetic flux can be engineered through laser-induced methods, explicitly breaking time-reversal symmetry. This potentially opens a bulk gap in the energy spectrum, which is associated with a non-trivial topological order, i.e. a non-zero Chern number. In this paper, we consider the possibility of producing and identifying such a robust Chern insulator in the laser-coupled honeycomb lattice. We explore a large parameter space spanned by experimentally controllable parameters and obtain a variety of phase diagrams, clearly identifying the accessible topologically non-trivial regimes. We discuss the signatures of Chern insulators in cold-atom systems, considering available detection methods. We also highlight the existence of topological semi-metals in this system, which are gapless phases characterized by non-zero winding numbers, not present in Haldane's original model.
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