Journal
PHYSICAL REVIEW LETTERS
Volume 128, Issue 22, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.128.223903
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Funding
- Key-Area Research and Development Program of Guangdong Province [2019B030330001]
- National Natural Science Foundation of China (NSFC) [92050110, 91736106, 11674390, 91836302, 91850117, 11654003]
- National Key R&D Program of China [2018YFA0306504]
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The study reveals the gain-loss-induced hybrid second-order skin-topological effect and the PT phase transition in skin-topological modes. The localized behavior of topological edge modes on a special type of corner, in contrast to the extended bulk modes, is found to be related to the interplay between gain, loss, and the chiral edge currents induced by nonlocal flux. The research establishes a relation between the skin-topological effect and the PT symmetries belonging to different edges.
Non-Hermitian topological effects are of crucial importance both in fundamental physics and applications. Here we discover the gain-loss-induced hybrid second-order skin-topological effect and the PT phase transition in skin-topological modes. By studying a non-Hermitian Haldane model, we find that the topological edge modes are localized on a special type of corner, while the bulk modes remain extended. Such an effect originates from the interplay between gain, loss, and the chiral edge currents induced by the nonlocal flux, which can be characterized by considering the properties of the edge sites as a one-dimensional chain. We establish a relation between the skin-topological effect and the PT symmetries belonging to different edges. Moreover, we discover the PT phase transition with the emergence of exceptional points between pairs of skin-topological modes. Our results pave the way for the investigation of non-Hermitian topological physics and PT phase transition in higher-dimensional systems.
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