تقرير
Fragile dislocation modes in obstructed atomic topological phases
| العنوان: | Fragile dislocation modes in obstructed atomic topological phases |
|---|---|
| المؤلفون: | Malavé, Gabriel, Schifferli, Jorge, Soto-Garrido, Rodrigo, Orellana, Pedro A., Juričić, Vladimir |
| سنة النشر: | 2023 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics, Condensed Matter - Materials Science |
| الوصف: | 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. Comment: Accepted for publication as a letter in PRB: 6 pages, 5 figures (Supplementary Information as Ancillary file) |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2310.10779 |
| رقم الأكسشن: | edsarx.2310.10779 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |