Observation of topological edge states induced solely by non-Hermiticity in an acoustic crystal

Gao, He; Xue, Haoran; Wang, Qiang; Gu, Zhongming; Liu, Tuo; Zhu, Jie; Zhang, Baile

doi:10.1103/physrevb.101.180303

Cited by 77 publications

(39 citation statements)

References 43 publications

(55 reference statements)

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“…Moreover, although we have focused on screw dislocations, there are other types of lattice defects that may host topological modes with different characteristics, which could be similarly studied using acoustic structures. Finally, it would be interesting to study non-Hermitian band topological effects [52][53][54][55][56][57][58][59][60][61][62], which can have interesting interactions with topological lattice defects [63][64][65][66], by using passive [57,58] or active [59] methods to introduce non-Hermiticity into acoustic structures.…”

Section: Observation Of Dislocation-induced Topological Modes In a Th...mentioning

confidence: 99%

Observation of Dislocation-Induced Topological Modes in a Three-Dimensional Acoustic Topological Insulator

Xue

Ding

et al. 2021

Phys. Rev. Lett.

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The interplay between real-space topological lattice defects and the reciprocal-space topology of energy bands can give rise to novel phenomena, such as one-dimensional topological modes bound to screw dislocations in three-dimensional topological insulators. We obtain direct experimental observations of dislocation-induced helical modes in an acoustic analog of a weak three-dimensional topological insulator. The spatial distribution of the helical modes is found through spin-resolved field mapping, and verified numerically by tight-binding and finite-element calculations. These one-dimensional helical channels can serve as robust waveguides in three-dimensional media. Our experiment paves the way to studying novel physical modes and functionalities enabled by topological lattice defects in three-dimensional classical topological materials.

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Section: Observation Of Dislocation-induced Topological Modes In a Th...mentioning

confidence: 99%

Observation of Dislocation-Induced Topological Modes in a Three-Dimensional Acoustic Topological Insulator

Xue

Ding

et al. 2021

Phys. Rev. Lett.

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“…[20] but with a non-magnetic design. Moreover, the introduction of non-Hermiticity, which is available and can be tuned in various artificial topological systems [49][50][51][52][53][54][55][56][57][58], may lead to new physical effects yet to be explored [59].…”

Section: (B)mentioning

confidence: 99%

Observation of dislocation-induced topological modes in a three-dimensional acoustic topological insulator

Xue,

Jia,

et al. 2021

Preprint

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“…Theoretically, these unique phases have been classified according to their symmetries and exceptional topologies [7][8][9][10][11][12]. Experimentally, non-Hermitian topological phases have been engineered in a broad range of physical platforms [13][14][15][16][17][18][19][20][21][22][23][24][25][26], yielding potential applications such as topological lasers [27][28][29] and high-performance sensors [30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Topological delocalization transitions and mobility edges in the nonreciprocal Maryland model

Zhou,

2021

Preprint

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Non-Hermitian effects could trigger spectrum, localization and topological phase transitions in quasiperiodic lattices. We propose a non-Hermitian extension of the Maryland model, which forms a paradigm in the study of localization and quantum chaos by introducing asymmetry to its hopping amplitudes. The resulting nonreciprocal Maryland model is found to possess a real-to-complex spectrum transition at a finite amount of hopping asymmetry, through which it changes from a localized phase to a mobility edge phase. Explicit expressions of the complex energy dispersions, phase boundaries and mobility edges are found. A topological winding number is further introduced to characterize the transition between different phases. Our work introduces a unique type of non-Hermitian quasicrystal, which admits exactly obtainable phase diagrams, mobility edges, and holding no extended phases at finite nonreciprocity in thermodynamic limit.

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Observation of topological edge states induced solely by non-Hermiticity in an acoustic crystal

Cited by 77 publications

References 43 publications

Observation of Dislocation-Induced Topological Modes in a Three-Dimensional Acoustic Topological Insulator

Observation of Dislocation-Induced Topological Modes in a Three-Dimensional Acoustic Topological Insulator

Observation of dislocation-induced topological modes in a three-dimensional acoustic topological insulator

Topological delocalization transitions and mobility edges in the nonreciprocal Maryland model

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