Spinful Topological Phases in Acoustic Crystals with Projective PT Symmetry

Meng, Yan1; Lin, Shuxin1; Shi, Bin-jie2; Wei, Bin3,4; Yang, Linyun1; Yan, Bei1; Zhu, Zhenxiao1; Xi, Xiang1; Wang, Yin2; Ge, Yong2; Yuan, Shou-qi2; Chen, Jingming1; Liu, Gui-Geng5; Sun, Hong-xiang2,6; Chen, Hongsheng7,8,9,10; Yang, Yihao7,8,9,10; Gao, Zhen1

2023-01-13

10.1103/PhysRevLett.130.026101

PHYSICAL REVIEW LETTERS   Impact Factor & Quartile

0031-9007

1079-7114

For the classification of topological phases of matter, an important consideration is whether a system is spinless or spinful, as these two classes have distinct symmetry algebra that gives rise to fundamentally different topological phases. However, only recently has it been realized theoretically that in the presence of gauge symmetry, the algebraic structure of symmetries can be projectively represented, which possibly enables the switch between spinless and spinful topological phases. Here, we report the experimental demonstration of this idea by realizing spinful topological phases in "spinless" acoustic crystals with projective space-time inversion symmetry. In particular, we realize a one-dimensional topologically gapped phase characterized by a 21 winding number, which features double-degenerate bands in the entire Brillouin zone and two pairs of degenerate topological boundary modes. Our Letter thus overcomes a fundamental constraint on topological phases by spin classes.

SCI

English

NI Journal Papers

First ; Corresponding

National Natural Science Foundation of China[2020YFC1512403] ; Shenzhen Science and Technology Innovation Commission[Y01236248] ; SUSTech["2022YFA1404704","2022YFA1404902"] ; Zhejiang University - Key Research and Development Program of the Ministry of Science and Technology["2022YFA1405201","11961141010","62175215"] ; National Natural Science Foundation of China (NNSFC)["61975176","2021FZZX001-19","12104211"] ; Fundamental Research Funds for the Central Universities[12274183] ; null[20220815111105001] ; null[Y01236148] ; null[12174159]

Physics

Physics, Multidisciplinary

WOS:000923290900002

AMER PHYSICAL SOC

PHYSICS

Web of Science

1.Southern Univ Sci & Technol, Dept Elect & Elect Engn, Shenzhen 518055, Peoples R China
2.Jiangsu Univ, Res Ctr Fluid Machinery Engn & Technol, Sch Phys & Elect Engn, Zhenjiang 212013, Peoples R China
3.Chinese Acad Sci, Inst Semicond, SKLSM, Beijing 100083, Peoples R China
4.Univ Chinese Acad Sci, Ctr Excellence Topol Quantum Computat, Beijing 100190, Peoples R China
5.Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, 21 Nanyang Link, Singapore City 637371, Singapore
6.Chinese Acad Sci, Inst Acoust, State Key Lab Acoust, Beijing 100190, Peoples R China
7.Zhejiang Univ, Interdisciplinary Ctr Quantum Informat, ZJU Hangzhou Global Sci & Technol Innovat Ctr, State Key Lab Extreme Photon & Instrumentat, Hangzhou 310027, Peoples R China
8.Zhejiang Univ, Electromagnet Acad Zhejiang Univ, Int Joint Innovat Ctr, Haining 314400, Peoples R China
9.Zhejiang Univ, Jinhua Inst Zhejiang Univ, Key Lab Adv Micro Nano Elect Devices & Smart Syst, Jinhua 321099, Peoples R China
10.Zhejiang Univ, Shaoxing Inst Zhejiang Univ, Shaoxing 312000, Peoples R China

Meng, Yan,Lin, Shuxin,Shi, Bin-jie,et al. Spinful Topological Phases in Acoustic Crystals with Projective PT Symmetry[J]. PHYSICAL REVIEW LETTERS,2023,130(2).

Meng, Yan.,Lin, Shuxin.,Shi, Bin-jie.,Wei, Bin.,Yang, Linyun.,...&Gao, Zhen.(2023).Spinful Topological Phases in Acoustic Crystals with Projective PT Symmetry.PHYSICAL REVIEW LETTERS,130(2).

Meng, Yan,et al."Spinful Topological Phases in Acoustic Crystals with Projective PT Symmetry".PHYSICAL REVIEW LETTERS 130.2(2023).