Nonreciprocal Su-Schrieffer-Heeger lattice in the presence of next-nearest-neighboring coupling

Zhou, Weihua; Chun-xian, Zhang

doi:10.1088/1402-4896/acc4f1

Cited by 2 publications

(1 citation statement)

References 53 publications

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“…In such spoof plasmonic systems, non-Hermitian coupling, which has been realized to observe anti-P T phase transition [39], could also be implemented to interact with the long-range coupling. Such a platform would be promising for investigating many interesting non-Hermitian topological phenomena (such as the non-Hermitian skin effect [47][48][49]). Moreover, the parity of resonance modes could be manipulated by incorporating interorbital couplings originating from spectral overlapping between neighboring modes.…”

Section: Discussionmentioning

confidence: 99%

Polarization-wavelength Locked Plasmonic Topological States

Li,

Zhang,

Chen

et al. 2023

PIER

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Plasmonic topological states, providing a new way to bypass the diffraction limits and against fabrication disorders, have attracted intense attention. In addition to the near-field coupling and band topology, the localized surface plasmonic resonance modes can be manipulated with far-field degrees of freedom (DoFs), such as polarization. However, changing the frequency of the topological edge states with different polarized incident waves remains a challenge, which has led to significant interest in multiplexed radiative topological devices. Here, we report the realization of polarization-wavelength locked plasmonic topological edge states on the Su-Schrieffer-Heeger (SSH) model. We theoretically and numerically show that such phenomenon is based on two mechanisms, i.e., the splitting in the spectra of plasmonic topological edge states with different intrinsic parity DoF and projecting the farfield polarizations to the parity of lattice modes. These results promise applications in robust optical emitters and multiplexed photonic devices.

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Section: Discussionmentioning

confidence: 99%

Polarization-wavelength Locked Plasmonic Topological States

Li,

Zhang,

Chen

et al. 2023

PIER

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Transition Characteristics of Non‐Hermitian Skin Effects in a Zigzag Lattice Without Chiral Symmetry

Wang

Chen

et al. 2023

Advanced Physics Research

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Non‐Hermitian systems recently have attracted tremendous attention due to their plentiful unique and fascinating properties, among which is the localization of an otherwise extensive bulk eigen‐state at the boundary when the open boundary condition (OBC) is imposed, an interesting phenomenon now referred to as non‐Hermitian skin effect (NHSE). Here, a non‐Hermitian Zigzag lattice model with/without chiral symmetry is investigated with respect to different nearest‐neighbor and long‐range hopping amplitudes and study the transition signature of NHSE by extracting information from the complex eigen‐energy spectra of the system under the periodic boundary condition (PBC), which is verified by the directional inverse participation ratio under OBC. Such an approach provides great simplicity in judging transitions of NHSE especially in lattices without chiral symmetry, where the obtained transition signatures are further confirmed by calculating the topological winding number of the energy under PBC. This work reveals a fundamental way to explore transitions of NHSE, and has a potential in helping understand more other complicated topological physics unique to non‐Hermitian systems.

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Nonreciprocal Su-Schrieffer-Heeger lattice in the presence of next-nearest-neighboring coupling

Cited by 2 publications

References 53 publications

Polarization-wavelength Locked Plasmonic Topological States

Polarization-wavelength Locked Plasmonic Topological States

Transition Characteristics of Non‐Hermitian Skin Effects in a Zigzag Lattice Without Chiral Symmetry

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