Photonic corner skin modes

Abstract

Useful in the enhancement of light-matter interaction, localization of light is at the heart of photonics studies. Different approaches have been proposed to localize light, including those based on dynamical localization, topological trivial or nontrivial defects in the band gap of photonic crystals, and bound states in the continuum. Recent studies on non-Hermitian skin effect have provided us new means to localize waves. In this work, we propose a new method towards localized light, called photonic corner skin modes arising from second-order non-Hermitian skin effect and gain-loss symmetry on a lattice. Specifically, we propose to make use of small pseudo-inversion symmetric gain/loss, which does not close the band gap, to realize a photonic Chern insulator with chiral edge states. The chiral edge states then accumulate at certain corners of the system. Intriguing phenomena such as corner skin modes arising from an underlying bipolar second-order non-Hermitian skin effect and multiple-corner skin modes are predicted in continuous systems.

arXiv comment6 figures, 8 pages

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Cited by in corpus (14)

• Non-Hermitian Chiral Skin Effect
• Hybrid skin-topological effect induced by eight-site cells and arbitrary adjustment of the localization of topological edge states
• Universal platform of point-gap topological phases from topological materials
• Non-Hermitian Topology in Hermitian Topological Matter
• Non-Hermitian Second-Order Topological Phases and Bipolar Skin Effect in Photonic Kagome Crystals
• Non-Bloch band theory for non-Hermitian continuum systems
• Non-Hermitian topological phases and skin effects in kagome lattices
• Tunable Aharonov-Bohm cages through anti-$\mathcal{P}\mathcal{T}$-symmetric imaginary couplings
• Implementing non-Abelian Hatano-Nelson model in electric circuits
• Dissipation Enhanced Unidirectional Transport in Topological Systems
• Multiple topological transitions and spectral singularities in non-Hermitian Floquet systems
• Optical non-Hermitian skin effect in two-dimensional uniform media
• Hinge non-Hermitian skin effect in the single-particle properties of a strongly correlated f-electron system
• Hybrid Higher-Order Skin Topological Modes in the Two-Dimensional Su-Schrieffer-Heeger Model with Nonreciprocal Hoppings