Kavli Affiliate: Long Zhang
| First 5 Authors: Yuejiu Zhao, Long Zhang, Fu-Chun Zhang, ,
| Summary:
Quantum anomalous Hall (QAH) systems with high Chern number ($|C|>1$) are
rare. This Letter introduces a Haldane-graphene multilayer heterostructure
hosting QAH states with arbitrary Chern number. In a rhombohedral-stacked
graphene $N$-layer, the Dirac points at $K_{pm}$ become $N^text{th}$-order
zeros of the low-energy effective Hamiltonian. When an extra layer of Haldane
model is stacked on top of the multilayer, the high-order Dirac points are
gapped out and the heterostructure enters QAH phases with $|C|=N+1$. Therefore,
gapping out high-order Dirac points paves a new way to high Chern number QAH
states.
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