articlePhysical Review LettersJul 2, 2019GREEN OA

Hybrid Higher-Order Skin-Topological Modes in Nonreciprocal Systems

CHChing Hua LeeLLLinhu LiJGJiangbin Gong

Agency for Science, Technology and Research · National University of Singapore · +1 more institution

PubMed
Indexed inarxivcrossrefpubmed

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…

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  • Order (exchange)
  • Topology (electrical circuits)
  • Physics
  • Theoretical physics
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