| Autor: |
Chiu, Wei-Chi, Mardanya, Sougata, Markiewicz, Robert, Nieminen, Jouko, Singh, Bahadur, Hakioglu, Tugrul, Agarwal, Amit, Chang, Tay-Rong, Lin, Hsin, Bansil, Arun |
| Rok vydání: |
2021 |
| Předmět: |
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| Druh dokumentu: |
Working Paper |
| Popis: |
Despite the progress made in successful prediction of many classes of weakly-correlated topological materials, it is not clear how a topological order can emerge from interacting orders and whether or not a charge ordered topological state can exist in a two-dimensional (2D) material. Here, through first-principles modeling and analysis, we identify a 2$\times$2 charge density wave (CDW) phase in monolayer $2H$-NbSe$_2$ that harbors coexisting quantum spin Hall (QSH) insulator, topological crystalline insulator (TCI) and topological nodal line (TNL) semimetal states. The topology in monolayer NbSe$_2$ is driven by the formation of the CDW and the associated symmetry-breaking periodic lattice distortions and not via a pre-existing topology. Our finding of an emergent triple-topological state in monolayer $2H$-NbSe$_2$ will offer novel possibilities for exploring connections between different topologies and a unique materials platform for controllable CDW-induced topological states for potential applications in quantum electronics and spintronics and Majorana-based quantum computing. |
| Databáze: |
arXiv |
| Externí odkaz: |
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