Bosonic integer quantum Hall state without Landau levels on a square lattice

W Liu, Z Dong, Z Dong, C Liu, W Yan, Y Chen - Physical Review B, 2019 - APS
W Liu, Z Dong, Z Dong, C Liu, W Yan, Y Chen
Physical Review B, 2019APS
We study interacting two-component hard-core bosons on a square lattice for which, in the
presence of staggered magnetic flux, its ground state is a bosonic integer quantum Hall
(BIQH) state. By using a coupled-wire bosonization approach, we show analytically that this
model exhibits a BIQH state at total charge half filling associated with a symmetry-protected
topological phase under U (1) charge conservation. These theoretical expectations are
verified, using the infinite density matrix renormalization group method, by providing …
We study interacting two-component hard-core bosons on a square lattice for which, in the presence of staggered magnetic flux, its ground state is a bosonic integer quantum Hall (BIQH) state. By using a coupled-wire bosonization approach, we show analytically that this model exhibits a BIQH state at total charge half filling associated with a symmetry-protected topological phase under charge conservation. These theoretical expectations are verified, using the infinite density matrix renormalization group method, by providing numerical evidence for (i) a quantized Hall conductance , and (ii) two counterpropagating gapless edge modes. Our model is a bosonic cousin of the fermionic Haldane model and serves as an additional case of analogy between bosonic and fermionic quantum Hall states.
American Physical Society
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