Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevLett.123.016805
Title: Hybrid Higher-Order Skin-Topological Modes in Nonreciprocal Systems
Authors: Lee, Ching Hua 
Li, Linhu 
Gong, Jiangbin 
Keywords: Science & Technology
Physical Sciences
Physics, Multidisciplinary
Physics
Issue Date: 2-Jul-2019
Publisher: AMER PHYSICAL SOC
Citation: Lee, Ching Hua, Li, Linhu, Gong, Jiangbin (2019-07-02). Hybrid Higher-Order Skin-Topological Modes in Nonreciprocal Systems. PHYSICAL REVIEW LETTERS 123 (1). ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevLett.123.016805
Abstract: © 2019 American Physical Society. Higher-order phases are characterized by corner or hinge modes that arise due to the interesting interplay of localization mechanisms along two or more dimensions. In this work, we introduce and construct a novel class of "hybrid" higher-order skin-topological boundary modes in nonreciprocal systems with two or more open boundaries. Their existence crucially relies on nonreciprocal pumping in addition to topological localization. Unlike usual non-Hermitian "skin" modes, they can exist in lattices with vanishing net reciprocity due to the selective nature of nonreciprocal pumping: While the bulk modes remain extended due to the cancellation of nonreciprocity within each unit cell, boundary modes experience a curious spontaneous breaking of reciprocity in the presence of topological localization, thereby experiencing the non-Hermitian skin effect. The number of possible hybridization channels increases rapidly with dimensionality, leading to a proliferation of distinct phases. In addition, skin modes or hybrid skin-topological modes can restore unitarity and are hence stable, allowing for experimental observations and manipulations in non-Hermitian photonic and electrical metamaterials.
Source Title: PHYSICAL REVIEW LETTERS
URI: https://scholarbank.nus.edu.sg/handle/10635/168528
ISSN: 0031-9007
1079-7114
DOI: 10.1103/PhysRevLett.123.016805
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