Nature research paper: Thermodynamic evidence of fractional Chern insulator in moiré MoTe2
Chern insulators, which are the lattice analogs of the quantum Hall states, can potentially manifest high-temperature topological orders at zero magnetic field to enable next-generation topological quantum devices. To date, integer Chern insulators have been experimentally demonstrated in several systems at zero magnetic field, but fractional Chern insulators have been reported only in graphene-based systems under a finite magnetic field, which support tunable topological flat bands.
Here, we report thermodynamic evidence of both integer and fractional Chern insulators at zero magnetic field in small-angle twisted bilayer MoTeby combining the local electronic compressibility and magneto-optical measurements. At hole filling factor=1 and 2/3, the system is incompressible and spontaneously breaks time reversal symmetry. We show that they are integer and fractional Chern insulators, respectively, from the dispersion of the state in filling factor with applied magnetic field.
France Dernières Nouvelles, France Actualités
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