Report
Symmetry-protected localized states at defects in non-Hermitian systems
| العنوان: | Symmetry-protected localized states at defects in non-Hermitian systems |
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| المؤلفون: | Wu, Ya-Jie, Hou, Junpeng |
| المصدر: | Physical Review A 99, 062107 (2019) |
| سنة النشر: | 2019 |
| المجموعة: | Condensed Matter Physics (Other) |
| مصطلحات موضوعية: | Condensed Matter - Disordered Systems and Neural Networks, Condensed Matter - Quantum Gases, Physics - Optics |
| الوصف: | Understanding how local potentials affect system eigenmodes is crucial for experimental studies of nontrivial bulk topology. Recent studies have discovered many exotic and highly non-trivial topological states in non-Hermitian systems. As such, it would be interesting to see how non-Hermitian systems respond to local perturbations. In this work, we consider chiral and particle-hole -symmetric non-Hermitian systems on a bipartite lattice, including SSH model and photonic graphene, and find that a disordered local potential could induce bound states evolving from the bulk. When the local potential on a single site becomes infinite, which renders a lattice vacancy, chiral-symmetry-protected zero-energy mode and particle-hole symmetry-protected bound states with purely imaginary eigenvalues emerge near the vacancy. These modes are robust against any symmetry-preserved perturbations. Our work generalizes the symmetry-protected localized states to non-Hermitian systems. Comment: 8 pages, 9 figures |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevA.99.062107 |
| URL الوصول: | http://arxiv.org/abs/1905.09346 |
| رقم الانضمام: | edsarx.1905.09346 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevA.99.062107 |
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