Journal
PHYSICAL REVIEW B
Volume 92, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.92.195104
Keywords
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Funding
- EPSRC [EP/I032487/1, EP/I031014/1]
- NSF [DMR-1408916]
- EPSRC [EP/I032487/1, EP/I031014/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/I032487/1, 1106120, EP/I031014/1, 1100699] Funding Source: researchfish
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Even if a noninteracting system has zero Berry curvature everywhere in the Brillouin zone, it is possible to introduce interactions that stabilize a fractional Chern insulator. These interactions necessarily break time-reversal symmetry (either spontaneously or explicitly) and have the effect of altering the underlying band structure. We outline a number of ways in which this may be achieved and show how similar interactions may also be used to create a (time-reversal-symmetric) fractional topological insulator. While our approach is rigorous in the limit of long-range interactions, we show numerically that even for short-range interactions a fractional Chern insulator can be stabilized in a band with zero Berry curvature.
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