Journal
PHYSICAL REVIEW B
Volume 98, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.98.205129
Keywords
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Funding
- JSPS KAKENHI [JP17K17678]
- Materials Education program for the future leaders in Research, Industry, and Technology (MERIT)
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In recent years, the role of crystal symmetries in enriching the variety of TIs has been actively investigated. Higher-order TIs are a new type of topological crystalline insulators that exhibit gapless boundary states whose dimensionality is lower than those on the surface of conventional TIs. In this paper, relying on a concrete tight-binding model, we show that higher-order TIs can be smoothly connected to conventional TIs in a lower dimension without the bulk-gap closing or symmetry breaking. Our result supports the understanding of higher-order TIs as a stacking of lower-dimensional TIs in a way respecting all the crystalline symmetry.
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