Structural disorder-induced topological phase transitions in quasicrystals
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arXiv
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866908008416542720 |
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| author | Peng, Tan Xiong, Yong-Chen Hua, Chun-Bo Liu, Zheng-Rong Zhu, Xiaolu Cao, Wei Lv, Fang Hou, Yue Zhou, Bin Wang, Ziyu Xiong, Rui |
| author_facet | Peng, Tan Xiong, Yong-Chen Hua, Chun-Bo Liu, Zheng-Rong Zhu, Xiaolu Cao, Wei Lv, Fang Hou, Yue Zhou, Bin Wang, Ziyu Xiong, Rui |
| contents | Recently, the structural disorder-induced topological phase transitions in periodic systems have attracted much attention. However, in aperiodic systems such as quasicrystalline systems, the interplay between structural disorder and band topology is still unclear. In this work, we investigate the effects of structural disorder on a quantum spin Hall insulator phase and a higher-order topological phase in a two-dimensional Amman-Beenker tiling quasicrystalline lattice, respectively. We demonstrate that the structural disorder can induce a topological phase transition from a quasicrystalline normal insulator phase to an amorphous quantum spin Hall insulator phase, which is confirmed by bulk gap closing and reopening, robust edge states, quantized spin Bott index and conductance. Furthermore, the structural disorder-induced higher-order topological phase transition from a quasicrystalline normal insulator phase to an amorphous higher-order topological phase characterized by quantized quadrupole moment and topological corner states is also found. More strikingly, the disorder-induced higher-order topological insulator with eight corner states represents a distinctive topological state that eludes realization in conventional crystalline systems. Our work extends the study of the interplay between disorder effects and topologies to quasicrystalline and amorphous systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_04338 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Structural disorder-induced topological phase transitions in quasicrystals Peng, Tan Xiong, Yong-Chen Hua, Chun-Bo Liu, Zheng-Rong Zhu, Xiaolu Cao, Wei Lv, Fang Hou, Yue Zhou, Bin Wang, Ziyu Xiong, Rui Mesoscale and Nanoscale Physics Recently, the structural disorder-induced topological phase transitions in periodic systems have attracted much attention. However, in aperiodic systems such as quasicrystalline systems, the interplay between structural disorder and band topology is still unclear. In this work, we investigate the effects of structural disorder on a quantum spin Hall insulator phase and a higher-order topological phase in a two-dimensional Amman-Beenker tiling quasicrystalline lattice, respectively. We demonstrate that the structural disorder can induce a topological phase transition from a quasicrystalline normal insulator phase to an amorphous quantum spin Hall insulator phase, which is confirmed by bulk gap closing and reopening, robust edge states, quantized spin Bott index and conductance. Furthermore, the structural disorder-induced higher-order topological phase transition from a quasicrystalline normal insulator phase to an amorphous higher-order topological phase characterized by quantized quadrupole moment and topological corner states is also found. More strikingly, the disorder-induced higher-order topological insulator with eight corner states represents a distinctive topological state that eludes realization in conventional crystalline systems. Our work extends the study of the interplay between disorder effects and topologies to quasicrystalline and amorphous systems. |
| title | Structural disorder-induced topological phase transitions in quasicrystals |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2403.04338 |