Details

Autor(en) / Beteiligte

• Zhang, Dan-Wei
• Tang, Ling-Zhi
• Lang, Li-Jun
• Yan, Hui
• Zhu, Shi-Liang

Titel

Non-Hermitian topological Anderson insulators

Ist Teil von

• Science China. Physics, mechanics & astronomy, 2020-06, Vol.63 (6), p.267062, Article 267062

Ort / Verlag

Beijing: Science China Press

Erscheinungsjahr

2020

Link zum Volltext

Quelle

SpringerLink

Beschreibungen/Notizen

• Non-Hermitian systems can exhibit exotic topological and localization properties. Here we elucidate the non-Hermitian effects on disordered topological systems using a nonreciprocal disordered Su-Schrieffer-Heeger model. We show that the non-Hermiticity can enhance the topological phase against disorders by increasing bulk gaps. Moreover, we uncover a topological phase which emerges under both moderate non-Hermiticity and disorders, and is characterized by localized insulating bulk states with a disorder-averaged winding number and zero-energy edge modes. Such topological phases induced by the combination of non-Hermiticity and disorders are dubbed non-Hermitian topological Anderson insulators . We reveal that the system has unique non-monotonous localization behavior and the topological transition is accompanied by an Anderson transition. These properties are general in other non-Hermitian models.