https://scholars.lib.ntu.edu.tw/handle/123456789/634015
標題: | Protected Gapless Edge States In Trivial Topology | 作者: | Yun-Chung Chen Yu-Ping Lin YING-JER KAO |
關鍵字: | Physics - Mesoscopic Systems and Quantum Hall Effect; Physics - Mesoscopic Systems and Quantum Hall Effect; Physics - Strongly Correlated Electrons | 公開日期: | 10-六月-2022 | 卷: | 107 | 期: | 7 | 來源出版物: | Phys. Rev. B 107, 075126 (2022) | 摘要: | Bulk-boundary correspondence serves as an important feature of the strong topological insulators, including Chern insulators and $Z_2$ topological insulators. Under nontrivial band topology, the protected gapless edge states correspond to the Wannier obstruction or Wilson-loop winding in the bulk. Recent studies show that the bulk topological features may not imply the existence of protected gapless edge states. Here we address the opposite question: Does the existence of protected gapless edge states necessarily imply the Wannier obstruction or Wilson-loop winding? We provide an example where the protected gapless edge states arise without the aforementioned bulk topological features. This trivialized topological insulator belongs to a new class of systems with non-delta-like Wannier functions. Interestingly, the gapless edge states are not protected by the crystalline symmetry; instead the protection originates from the mirror antisymmetry, a combination of chiral and mirror symmetries. Although the protected gapless edge states cannot be captured by the bulk topological features, they can be characterized by the spectral flow in the entanglement spectrum. |
描述: | 7 pages, 4 figures |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/634015 | ISSN: | 24699950 | DOI: | 10.1103/PhysRevB.107.075126 |
顯示於: | 物理學系 |
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