Journal
PHYSICAL REVIEW B
Volume 91, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.041119
Keywords
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Funding
- DOE [DE-SC0005042]
- NSF [ECCS-1307744]
- MCubed program at the University of Michigan
- Directorate For Engineering [1307744] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys [1307744] Funding Source: National Science Foundation
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We construct generalized Hofstadter models that possess color-entangled flat bands and study interacting many-body states in such bands. For a system with periodic boundary conditions and appropriate interactions, there exist gapped states at certain filling factors for which the ground-state degeneracy depends on the number of unit cells along one particular direction. This puzzling observation can be understood intuitively by mapping our model to a single-layer or a multilayer system for a given lattice configuration. We discuss the relation between these results and the previously proposed topological nematic states, in which lattice dislocations have non-Abelian braiding statistics. Our study also provides a systematic way of stabilizing various fractional topological states in C > 1 flat bands and provides some hints on how to realize such states in experiments.
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