Journal
PHYSICAL REVIEW LETTERS
Volume 123, Issue 25, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.256402
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Funding
- Singapore MOE AcRF Tier 2 [MOE2017-T2-2-108]
- NSFC [11834014, 11504013, 11874201]
- Fundamental Research Funds for the Central Universities [0204/14380119]
- GRF of Hong Kong [HKU173057/17P]
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A second-order topological insulator (SOTI) in d spatial dimensions features topologically protected gapless states at its (d - 2)-dimensional boundary at the intersection of two crystal faces, but is gapped otherwise. As a novel topological state, it has been attracting great interest, but it remains a challenge to identify a realistic SOTI material in two dimensions (2D). Here, based on combined first-principles calculations and theoretical analysis, we reveal the already experimentally synthesized 2D material graphdiyne as the first realistic example of a 2D SOTI, with topologically protected 0D corner states. The role of crystalline symmetry, the robustness against symmetry breaking, and the possible experimental characterization are discussed. Our results uncover a hidden topological character of graphdiyne and promote it as a concrete material platform for exploring the intriguing physics of higher-order topological phases.
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