首页|Parity-dependent skin effects and topological properties in the multilayer nonreciprocal Su-Schrieffer-Heeger structures

Parity-dependent skin effects and topological properties in the multilayer nonreciprocal Su-Schrieffer-Heeger structures

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We concentrate on the skin effects and topological properties in the multi-layer non-Hermitian Su-Schrieffer-Heeger(SSH)structure,by taking into account the nonreciprocal couplings between the different sublattices in the unit cells.Following the detailed demonstration of the theoretical method,we find that in this system,the skin effects and topological phase transitions induced by nonreciprocal couplings display the apparent parity effect,following the increase of the layer number of this SSH structure.On the one hand,the skin effect is determined by the parity of the layer number of this SSH system,as well as the parity of the band index of the bulk states.On the other hand,for the topological edge modes,such an interesting parity effect can also be observed clearly.Next,when the parameter disorders are taken into account,the zero-energy edge modes in the odd-layer structures tend to be more robust,whereas the other edge modes are easy to be destroyed.In view of these results,it can be ascertained that the findings in this work promote to understand the influences of nonreciprocal couplings on the skin effects and topological properties in the multilayer SSH lattices.

multilayer SSH latticenonreciprocal couplingsband structureskin effect

Jia-Rui Li、Cui Jiang、Han Su、Di Qi、Lian-Lian Zhang、Wei-Jiang Gong

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College of Sciences,Northeastern University,Shenyang 110819,China

Basic Department,Shenyang Institute of Engineering,Shenyang 110136,China

LiaoNing Revitalization Talents ProgramNational Natural Science Foundation of ChinaNatural Science Foundation of Liaoning provinceFundamental Research Funds for the Central Universities of Ministry of Education of ChinaFundamental Research Funds for the Central Universities of Ministry of Education of China

XLYC1907033119050272023-MS-072N2209005N2205015

2024

10.1007/s11467-023-1350-y

物理学前沿
高等教育出版社

物理学前沿

CSTPCD
影响因子：0.816
ISSN：2095-0462
年,卷(期)：2024.19(3)
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