Discovery of higher-order topological insulators using the spin Hall conductivity as a topology signature
| Autor: | Gabriel R. Schleder, Carlos Mera Acosta, Marco Buongiorno Nardelli, Frank T. Cerasoli, A. C. M. Padilha, Adalberto Fazzio, Marcio Costa |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Boundary (topology)
FOS: Physical sciences 02 engineering and technology Topology 01 natural sciences QA76.75-76.765 Ab initio quantum chemistry methods 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) General Materials Science Computer software 010306 general physics Materials of engineering and construction. Mechanics of materials Topology (chemistry) Spin-½ Physics Condensed Matter - Materials Science Condensed Matter - Mesoscale and Nanoscale Physics Materials Science (cond-mat.mtrl-sci) 021001 nanoscience & nanotechnology Computer Science Applications Mechanics of Materials Modeling and Simulation Topological insulator Spin Hall effect TA401-492 Density functional theory 0210 nano-technology Realization (systems) |
| Zdroj: | npj Computational Materials, Vol 7, Iss 1, Pp 1-6 (2021) |
| ISSN: | 2057-3960 |
| Popis: | The discovery and realization of topological insulators, a phase of matter which hosts metallic boundary states when the d-dimension insulating bulk is confined to (d − 1)-dimensions, led to several potential applications. Recently, it was shown that protected topological states can manifest in (d − 2)-dimensions, such as hinge and corner states for three- and two-dimensional systems, respectively. These nontrivial materials are named higher-order topological insulators (HOTIs). Here we show a connection between spin Hall effect and HOTIs using a combination of ab initio calculations and tight-binding modeling. The model demonstrates how a non-zero bulk midgap spin Hall conductivity (SHC) emerges within the HOTI phase. Following this, we performed high-throughput density functional theory calculations to find unknown HOTIs, using the SHC as a criterion. We calculated the SHC of 693 insulators resulting in seven stable two-dimensional HOTIs. Our work guides novel experimental and theoretical advances towards higher-order topological insulator realization and applications. |
| Databáze: | OpenAIRE |
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