Exact mobility edges for almost-periodic CMV matrices via gauge symmetries
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arXiv
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| Hauptverfasser: | , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866912061248765952 |
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| author | Cedzich, Christopher Fillman, Jake Li, Long Ong, Darren Zhou, Qi |
| author_facet | Cedzich, Christopher Fillman, Jake Li, Long Ong, Darren Zhou, Qi |
| contents | We investigate the symmetries of so-called generalized extended CMV matrices. It is well-documented that problems involving reflection symmetries of standard extended CMV matrices can be subtle. We show how to deal with this in an elegant fashion by passing to the class of generalized extended CMV matrices via explicit diagonal unitaries in the spirit of Cantero-Grünbaum-Moral-Velázquez. As an application of these ideas, we construct an explicit family of almost-periodic CMV matrices, which we call the mosaic unitary almost-Mathieu operator, and prove the occurrence of exact mobility edges. That is, we show the existence of energies that separate spectral regions with absolutely continuous and pure point spectrum and exactly calculate them. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_10909 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Exact mobility edges for almost-periodic CMV matrices via gauge symmetries Cedzich, Christopher Fillman, Jake Li, Long Ong, Darren Zhou, Qi Spectral Theory Mathematical Physics Functional Analysis Quantum Physics We investigate the symmetries of so-called generalized extended CMV matrices. It is well-documented that problems involving reflection symmetries of standard extended CMV matrices can be subtle. We show how to deal with this in an elegant fashion by passing to the class of generalized extended CMV matrices via explicit diagonal unitaries in the spirit of Cantero-Grünbaum-Moral-Velázquez. As an application of these ideas, we construct an explicit family of almost-periodic CMV matrices, which we call the mosaic unitary almost-Mathieu operator, and prove the occurrence of exact mobility edges. That is, we show the existence of energies that separate spectral regions with absolutely continuous and pure point spectrum and exactly calculate them. |
| title | Exact mobility edges for almost-periodic CMV matrices via gauge symmetries |
| topic | Spectral Theory Mathematical Physics Functional Analysis Quantum Physics |
| url | https://arxiv.org/abs/2307.10909 |