Second-order topological phases protected by chiral symmetry
| Autor: | Ryo Okugawa, Shin Hayashi, Takeshi Nakanishi |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Physics
Phase transition Chiral symmetry Condensed Matter - Mesoscale and Nanoscale Physics High Energy Physics::Lattice Hinge FOS: Physical sciences Order (ring theory) 02 engineering and technology 021001 nanoscience & nanotechnology Topology 01 natural sciences Semimetal Phase (matter) Topological insulator Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Lattice model (physics) |
| Zdroj: | Physical Review B. 100 |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | We study second-order topological insulators and semimetals characterized by chiral symmetry. We investigate topological phase transitions of a model for construction of the two-dimensional second-order topological insulators protected only by chiral symmetry. By the theory of the phase transitions, we propose a second-order topological semimetal and insulators with flat hinge bands in chiral-symmetric three-dimensional systems. The three-dimensional second-order topological phases can be obtained from the stacked two-dimensional second-order topological insulators with chiral symmetry. Moreover, we show that broken chiral symmetry in the three-dimensional second-order topological phase allows a second-order topological insulator with chiral hinge states. We also demonstrate the second-order topological phases by using a lattice model. 9 pages, 5 figures |
| Databáze: | OpenAIRE |
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