Orbital corner states on breathing kagome lattices
| Autor: | Huanyang Chen, Xiancong Lu, Ying Chen |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics
Condensed matter physics Structure (category theory) 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Transverse plane Geometric phase Topological insulator 0103 physical sciences Astrophysics::Earth and Planetary Astrophysics 010306 general physics 0210 nano-technology Phase diagram |
| Zdroj: | Physical Review B. 101 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.101.195143 |
| Popis: | We investigate the higher-order topological insulators on the breathing kagome lattices with $p$-orbital freedom. The bulk topological phase diagram is obtained by calculating the ${Z}_{3}$ Berry phase of the $p$-band model. The existence of a different class of orbital corner states is demonstrated on the (zero-dimensional) finite-size triangular structure. We find that the transverse hopping of the $p$ orbital is essential for the corner states to appear on the finite-size structure. The orbital configurations of the corner states are also explored and rich orbital orders are identified. Moreover, we show that the orbital corner states can be realized in a realistic photonic system, which are in good agreement with the predictions of the tight-binding model and then offer a versatile platform for the orbital physics. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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