Disorder Driven Non-Anderson Transition in a Weyl Semimetal
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866912638805475328 |
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| author | Li, Cong Wang, Yang Zhang, Jianfeng Liu, Hongxiong Chen, Wanyu Liu, Guowei Deng, Hanbin Kim, Timur Polley, Craig Thiagarajan, Balasubramanian Yin, Jiaxin Shi, Youguo Xiang, Tao Tjernberg, Oscar |
| author_facet | Li, Cong Wang, Yang Zhang, Jianfeng Liu, Hongxiong Chen, Wanyu Liu, Guowei Deng, Hanbin Kim, Timur Polley, Craig Thiagarajan, Balasubramanian Yin, Jiaxin Shi, Youguo Xiang, Tao Tjernberg, Oscar |
| contents | For several decades, it was widely believed that a non-interacting disordered electronic system could only undergo an Anderson metal-insulator transition due to Anderson localization. However, numerous recent theoretical works have predicted the existence of a disorder-driven non-Anderson phase transition that differ from Anderson localization. The frustration lies in the fact that this non-Anderson disorder-driven transition has not yet been experimentally demonstrated in any system. Here, using angle-resolved photoemission spectroscopy, we present a case study of observing the non-Anderson disorder-driven transition by visualizing the electronic structure of the Weyl semimetal NdAlSi on surfaces with varying amounts of disorder. Our observations reveal that strong disorder can effectively suppress all surface states in the Weyl semimetal NdAlSi, including the topological surface Fermi arcs. This disappearance of surface Fermi arcs is associated with the vanishing of the bulk topological invariant, indicating a quantum phase transition from a Weyl semimetal to a diffusive metal. By analyzing the changes in the electronic structure of NdAlSi, as the surface degrades, we provide a physical picture of this non-Anderson transition from a Weyl semimetal to a diffuse metal. These observations provide the first direct experimental evidence of the non-Anderson disorder-driven transition, a discovery long anticipated by theoretical physicists. The finding dispels longstanding suspicions among researchers that non-Anderson transitions exist in real quantum systems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_14447 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Disorder Driven Non-Anderson Transition in a Weyl Semimetal Li, Cong Wang, Yang Zhang, Jianfeng Liu, Hongxiong Chen, Wanyu Liu, Guowei Deng, Hanbin Kim, Timur Polley, Craig Thiagarajan, Balasubramanian Yin, Jiaxin Shi, Youguo Xiang, Tao Tjernberg, Oscar Materials Science Other Condensed Matter For several decades, it was widely believed that a non-interacting disordered electronic system could only undergo an Anderson metal-insulator transition due to Anderson localization. However, numerous recent theoretical works have predicted the existence of a disorder-driven non-Anderson phase transition that differ from Anderson localization. The frustration lies in the fact that this non-Anderson disorder-driven transition has not yet been experimentally demonstrated in any system. Here, using angle-resolved photoemission spectroscopy, we present a case study of observing the non-Anderson disorder-driven transition by visualizing the electronic structure of the Weyl semimetal NdAlSi on surfaces with varying amounts of disorder. Our observations reveal that strong disorder can effectively suppress all surface states in the Weyl semimetal NdAlSi, including the topological surface Fermi arcs. This disappearance of surface Fermi arcs is associated with the vanishing of the bulk topological invariant, indicating a quantum phase transition from a Weyl semimetal to a diffusive metal. By analyzing the changes in the electronic structure of NdAlSi, as the surface degrades, we provide a physical picture of this non-Anderson transition from a Weyl semimetal to a diffuse metal. These observations provide the first direct experimental evidence of the non-Anderson disorder-driven transition, a discovery long anticipated by theoretical physicists. The finding dispels longstanding suspicions among researchers that non-Anderson transitions exist in real quantum systems. |
| title | Disorder Driven Non-Anderson Transition in a Weyl Semimetal |
| topic | Materials Science Other Condensed Matter |
| url | https://arxiv.org/abs/2402.14447 |