Hybrid Higher-Order Skin-Topological Modes in Nonreciprocal Systems

Physical Review Letters
Ching Hua LeeJiangbin Gong

Abstract

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.

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Citations

Nov 9, 2019·Physical Review Letters·Fei SongZhong Wang
May 18, 2020·Nature Communications·Haoran XueBaile Zhang
Jul 9, 2020·Physical Review Letters·Linhu LiJiangbin Gong
Sep 7, 2019·Physical Review Letters·Xi-Wang Luo, Chuanwei Zhang
Oct 6, 2020·Physical Review Letters·Kai ZhangChen Fang
Jan 11, 2020·Physical Review Letters·Fei SongZhong Wang
Feb 8, 2020·Physical Review Letters·Rui ChenDong-Hui Xu
Nov 9, 2019·Physical Review Letters·Zhongbo Yan
Mar 14, 2020·Physical Review Letters·Nobuyuki OkumaMasatoshi Sato
Nov 17, 2020·Physical Review Letters·Yifei Yi, Zhesen Yang
Mar 27, 2021·Nature Communications·He GaoBaile Zhang
Apr 16, 2021·Nature·Michel FruchartVincenzo Vitelli
Mar 13, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Xi-Xi BaoLei Tan
May 6, 2021·Nanomaterials·Longwen Zhou
Jun 12, 2021·Physical Review Letters·Kohei KawabataShinsei Ryu
Jul 3, 2021·Physical Review Letters·Li-Wei Yu, Dong-Ling Deng
Aug 5, 2021·Nature Communications·Lucas S PalaciosAdolfo G Grushin
Aug 24, 2021·Physical Review Letters·Xiao-Qi SunTaylor L Hughes
Sep 8, 2021·Nature Communications·Linhu LiJiangbin Gong
Sep 30, 2021·Nature Communications·M Michael DennerTitus Neupert
Nov 4, 2021·Nature Communications·Li ZhangBaile Zhang

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