Fan Yang, Yi-Xuan Ling, Xu-Hui Yan, Lu Qi, Xiuyun Zhang, Ying Han, Ai-Lei He
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引用次数: 0
Abstract
To investigate the influence of nanoholes on Chern insulators (CIs), we propose a porous Haldane model that considers the nearest-neighbor (NN) hoppings and next-NN (NNN) hoppings with staggered magnetic fluxes. This model supports multiple topological phases with different filling factors. At 2/5 filling, CI phases withC=±1,C = 2,C=±3,C=±4and higher-order topological insulator (HOTI) appear. At 9/20 filling, CI withC=±1,C = 2,C = 3, and HOTI phases are obtained. At half-filling, this model exhibits CI withC=±1,C = 2, andC=-3and HOTI phases. Unlike conventional HOTIs, these HOTI phases host gapless edge states and robust corner states which are characterized by a quantized quadrupole. Additionally, there is a topological flat band (TFB) with a flatness ratio about 13 with the NN and NNN hoppings. Based on the TFB model, we further investigate aν=1/2fractional CI state with hard-core bosons filling.
期刊介绍:
Journal of Physics: Condensed Matter covers the whole of condensed matter physics including soft condensed matter and nanostructures. Papers may report experimental, theoretical and simulation studies. Note that papers must contain fundamental condensed matter science: papers reporting methods of materials preparation or properties of materials without novel condensed matter content will not be accepted.