Spinful topological phases in acoustic crystals with projective PT symmetry

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...

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Main Authors: Meng, Yan, Lin, Shuxin, Shi, Bin-Jie, Wei, Bin, Yang, Linyun, Yan, Bei, Zhu, Zhenxiao, Xi, Xiang, Wang, Yin, Ge, Yong, Yuan, Shou-Qi, Chen, Jingming, Liu, Gui-Geng, Sun, Hong-Xiang, Chen, Hongsheng, Yang, Yihao, Gao, Zhen
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2023
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Online Access:https://hdl.handle.net/10356/169405
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1694052023-07-24T15:34:50Z Spinful topological phases in acoustic crystals with projective PT symmetry Meng, Yan Lin, Shuxin Shi, Bin-Jie Wei, Bin Yang, Linyun Yan, Bei Zhu, Zhenxiao Xi, Xiang Wang, Yin Ge, Yong Yuan, Shou-Qi Chen, Jingming Liu, Gui-Geng Sun, Hong-Xiang Chen, Hongsheng Yang, Yihao Gao, Zhen School of Physical and Mathematical Sciences Science::Physics Acoustic Crystal PT symmetries 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 2Z 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. Published version Z. G. acknowledges support from the National Natural Science Foundation of China under Grants No. 12104211, Shenzhen Science and Technology Innovation Commission under Grant No. 20220815111105001, and SUSTech under Grants No. Y01236148 and No. Y01236248. The work at Zhejiang University was sponsored by the Key Research and Development Program of the Ministry of Science and Technology under Grants No. 2022YFA1404704 (H. C.), No. 2022YFA1404902 (Y. Y.), and No. 2022YFA1405201 (Y. Y.), the National Natural Science Foundation of China (NNSFC) under Grants No. 11961141010 (H. C.), No. 62175215 (Y. Y.), and No. 61975176 (H. C.), the Fundamental Research Funds for the Central Universities (2021FZZX001-19) (Y. Y.), and the Excellent Young Scientists Fund Program (Overseas) of China (Y. Y.). H. S. acknowledges the support from the National Natural Science Foundation of China (Grants No. 12274183 and No. 12174159), and the National Key Research and Development Program of China (Grant No. 2020YFC1512403). 2023-07-18T01:24:32Z 2023-07-18T01:24:32Z 2023 Journal Article Meng, Y., Lin, S., Shi, B., Wei, B., Yang, L., Yan, B., Zhu, Z., Xi, X., Wang, Y., Ge, Y., Yuan, S., Chen, J., Liu, G., Sun, H., Chen, H., Yang, Y. & Gao, Z. (2023). Spinful topological phases in acoustic crystals with projective PT symmetry. Physical Review Letters, 130(2), 026101-. https://dx.doi.org/10.1103/PhysRevLett.130.026101 0031-9007 https://hdl.handle.net/10356/169405 10.1103/PhysRevLett.130.026101 36706409 2-s2.0-85146354874 2 130 026101-1 026101-7 en Physical Review Letters © 2023 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Physics
Acoustic Crystal
PT symmetries
spellingShingle Science::Physics
Acoustic Crystal
PT symmetries
Meng, Yan
Lin, Shuxin
Shi, Bin-Jie
Wei, Bin
Yang, Linyun
Yan, Bei
Zhu, Zhenxiao
Xi, Xiang
Wang, Yin
Ge, Yong
Yuan, Shou-Qi
Chen, Jingming
Liu, Gui-Geng
Sun, Hong-Xiang
Chen, Hongsheng
Yang, Yihao
Gao, Zhen
Spinful topological phases in acoustic crystals with projective PT symmetry
description 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 2Z 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.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Meng, Yan
Lin, Shuxin
Shi, Bin-Jie
Wei, Bin
Yang, Linyun
Yan, Bei
Zhu, Zhenxiao
Xi, Xiang
Wang, Yin
Ge, Yong
Yuan, Shou-Qi
Chen, Jingming
Liu, Gui-Geng
Sun, Hong-Xiang
Chen, Hongsheng
Yang, Yihao
Gao, Zhen
format Article
author Meng, Yan
Lin, Shuxin
Shi, Bin-Jie
Wei, Bin
Yang, Linyun
Yan, Bei
Zhu, Zhenxiao
Xi, Xiang
Wang, Yin
Ge, Yong
Yuan, Shou-Qi
Chen, Jingming
Liu, Gui-Geng
Sun, Hong-Xiang
Chen, Hongsheng
Yang, Yihao
Gao, Zhen
author_sort Meng, Yan
title Spinful topological phases in acoustic crystals with projective PT symmetry
title_short Spinful topological phases in acoustic crystals with projective PT symmetry
title_full Spinful topological phases in acoustic crystals with projective PT symmetry
title_fullStr Spinful topological phases in acoustic crystals with projective PT symmetry
title_full_unstemmed Spinful topological phases in acoustic crystals with projective PT symmetry
title_sort spinful topological phases in acoustic crystals with projective pt symmetry
publishDate 2023
url https://hdl.handle.net/10356/169405
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