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- W3135963710 abstract "Fractional Chern insulator (FCI) states have been proposed in singular lattices with arbitrary $n$-fold rotational symmetry. Particles occupy non-defect-core orbitals in previously reported FCIs. However, the role of defect-core orbitals in the singular-lattice FCI states has seldom been discussed. In this paper, we report a series of singular-lattice FCI states with one particle occupying the defect-core orbital. This singular-lattice FCI state can be identified with the aid of the edge excitations, the angular momentum of the ground state (GS), and the optimal trial wave functions. Edge excitations and GS angular momentum are obtained using exact diagonalization. Optimal trial wave functions are constructed on the basis of the generalized Pauli principle, the Jack polynomials, and single-particle states. The present FCI state is identified as a $ensuremath{nu}=1/2$ FCI with high values of wave function overlap, where one particle occupies the low-energy defect-core orbital. Our studies reveal the intriguing interplay between the singular-lattice FCI and the defect-core orbital and provide an effective approach for future researches on FCIs with various defects or disorders." @default.
- W3135963710 created "2021-03-29" @default.
- W3135963710 creator A5064999331 @default.
- W3135963710 date "2021-03-22" @default.
- W3135963710 modified "2023-09-25" @default.
- W3135963710 title "Role of the defect-core orbital in fractional Chern insulators" @default.
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- W3135963710 doi "https://doi.org/10.1103/physrevb.103.115138" @default.
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