Repulsive interactions drive a direct transition between a Chern insulator with Hall conductance 4 and a 1/3 Laughlin state in the Harper-Hofstadter model.
Light-induced gauge fields for ultracold atoms,
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Interaction-driven plateau transition between integer and fractional Chern Insulators
Repulsive interactions drive a direct transition between a Chern insulator with Hall conductance 4 and a 1/3 Laughlin state in the Harper-Hofstadter model.