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How Similar Can Fractional Chern Insulators Be to Fractional Quantum Hall States? Moiré-Enhanced Gaps and Excitation-Spectrum Correspondence
Siddhartha Sarkar, Yitong Zhang, Kai Sun
Fractional Chern insulators (FCIs) realize fractional quantum Hall topology in lattice bands, but their excitation spectra remain far less understood than their ground states. Here…
Quantum phases of hard-core bosons in a frustrated honeycomb lattice
Christopher N. Varney, Kai Sun, Victor Galitski +1
Using exact diagonalization calculations, we investigate the ground-state phase diagram of the hard-core Bose-Hubbard-Haldane model on the honeycomb lattice. This allows us to prob…
Kaleidoscope of exotic quantum phases in a frustrated XY model
Christopher N. Varney, Kai Sun, Victor Galitski +1
The existence of quantum spin liquids was first conjectured by Pomeranchuk some 70 years ago, who argued that frustration in simple antiferromagnetic theories could result in a Fer…