時間反衍對稱耦合BHZ模型之研究
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Date
2025
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The concept of the Wilson loop is applied to analyze the extended Bernevig-Hughes-Zhang (BHZ) model with a time-reversal symmetric coupling. According to the so-called periodic table, such a system is classified by a $mathbb{Z}_2$ topological invariant, ν. We find that the system is in the trivial phase (ν=0) when the Chern number, C, of the associated extended Qi-Wu-Zhang (QWZ) model is even and the system is in the topological phase (ν=1) when C of the associated extended QWZ model is odd.
The concept of the Wilson loop is applied to analyze the extended Bernevig-Hughes-Zhang (BHZ) model with a time-reversal symmetric coupling. According to the so-called periodic table, such a system is classified by a $mathbb{Z}_2$ topological invariant, ν. We find that the system is in the trivial phase (ν=0) when the Chern number, C, of the associated extended Qi-Wu-Zhang (QWZ) model is even and the system is in the topological phase (ν=1) when C of the associated extended QWZ model is odd.
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none, BHZ model, topological insulator, Wilson loop, SSH model, QWZ model