Fragile dislocation modes in obstructed atomic topological phases
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866929618835996672 |
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| author | Malavé, Gabriel Schifferli, Jorge Soto-Garrido, Rodrigo Orellana, Pedro A. Juričić, Vladimir |
| author_facet | Malavé, Gabriel Schifferli, Jorge Soto-Garrido, Rodrigo Orellana, Pedro A. Juričić, Vladimir |
| contents | We here introduce the concept of fragile topological dislocation modes, which are localized only in a fraction of a topological phase, while otherwise leak into the bulk continuum. We show that such dislocation modes are hosted in an obstructed atomic topological phase in the two-dimensional Su-Schrieffer-Heeger model, but only in a finite region with an indirect gap at high energy. These dislocation modes are realized as chiral pairs at finite energies with protection stemming from a combination of the chiral (unitary particle-hole) and the point group (C$_{4v}$) symmetries, but only when the indirect gap is open. In this regime, we corroborate the stability of the defect modes by following their localization and also by explicitly adding a weak chemical potential disorder. Our findings, therefore, should be consequential for the experimental observation of such modes in designer topological crystals and classical metamaterials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_10779 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Fragile dislocation modes in obstructed atomic topological phases Malavé, Gabriel Schifferli, Jorge Soto-Garrido, Rodrigo Orellana, Pedro A. Juričić, Vladimir Mesoscale and Nanoscale Physics Materials Science We here introduce the concept of fragile topological dislocation modes, which are localized only in a fraction of a topological phase, while otherwise leak into the bulk continuum. We show that such dislocation modes are hosted in an obstructed atomic topological phase in the two-dimensional Su-Schrieffer-Heeger model, but only in a finite region with an indirect gap at high energy. These dislocation modes are realized as chiral pairs at finite energies with protection stemming from a combination of the chiral (unitary particle-hole) and the point group (C$_{4v}$) symmetries, but only when the indirect gap is open. In this regime, we corroborate the stability of the defect modes by following their localization and also by explicitly adding a weak chemical potential disorder. Our findings, therefore, should be consequential for the experimental observation of such modes in designer topological crystals and classical metamaterials. |
| title | Fragile dislocation modes in obstructed atomic topological phases |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2310.10779 |