期刊
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
卷 23, 期 3, 页码 2134-2140出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0cp05374k
关键词
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资金
- National Natural Science Foundation of China [11834002]
- Natural Science Foundation of Jiangsu Province [BK20200345]
- Research Funds for the Central Universities of China
In this study, a two-dimensional CX3 (X = Sb, Bi) monolayer was found to be a quantum spin Hall insulator with a large band gap, enabling the realization of the quantum spin Hall effect at room temperature. The topological properties of CX3 monolayer, including unique topologically entangled Rashba-splitting edge states, were preserved even with a h-BN substrate, providing potential applications in low-dissipation electronic devices.
Two-dimensional topological materials attracted intense interest in condensed matter physics due to their topologically protected edge states and potential applications in electronic devices. Here, based on first-principles calculations, we found that a two-dimensional CX3 (X = Sb, Bi) monolayer is a quantum spin Hall insulator with a large band gap. With the strong spin-orbit coupling effect, CX3 exhibits noticeable bulk band gaps up to 470 meV, sufficiently large for realizing the quantum spin Hall effect at room temperature. The topological characteristic is confirmed by the Z(2) invariant since the system preserves time-reversal symmetry. Particularly, the CSb3 monolayer displays unique topologically entangled Rashba-splitting edge states, resembling nearly free-electron quadratic dispersion. Such topologically entangled Rashba-like edge states derive from the spin-orbit coupling effect and inversion symmetry breaking on the edges. Moreover, we demonstrate that the topological properties are perfectly preserved in the CX3 monolayer even with a h-BN substrate. The nontrivial quantum spin Hall state in the CX3 monolayer will provide possibilities for studying a novel phenomenon of edge states and potential applications in low-dissipation electronic devices.
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