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Journal Articles Physical Review B: Condensed Matter and Materials Physics (1998-2015) Year : 2012

Zoology of Fractional Chern Insulators

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We study four different models of Chern insulators in the presence of strong electronic repulsion at partial fillings. We observe that all cases exhibit a Laughlin-like phase at filling fraction 1/3. We provide evidence of such a strongly correlated topological phase by studying both the energy and the entanglement spectra. In order to identify the key ingredients of the emergence of Laughlin physics in these systems, we show how they are affected when tuning the band structure. We also address the question of the relevance of the Berry curvature flatness in this problem. Using three-body interactions, we show that some models can also host a topological phase reminiscent of the nu=1/2 Pfaffian Moore-Read state. Additionally, we identify the structures indicating cluster correlations in the entanglement spectra.

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hal-00703413 , version 1 (01-06-2012)



Yang-Le Wu, B. Andrei Bernevig, N. Regnault. Zoology of Fractional Chern Insulators. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2012, 85, pp.075116. ⟨10.1103/PhysRevB.85.075116⟩. ⟨hal-00703413⟩
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