Angle-resolved photoemission intensity for multi-orbital bands: Complex interplay between the self-energy matrix and the optical matrix elements
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908479815417856 |
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| author | Yam, Yau Chuen Berciu, Mona Sawayzky, George A. |
| author_facet | Yam, Yau Chuen Berciu, Mona Sawayzky, George A. |
| contents | We use a simple one-dimensional two-band model with electron-phonon coupling to illustrate some of the complications that arise in multi-band systems when trying to extract a self-energy using the typical approach used for single-band systems when analyzing angle-resolved photoemission spectroscopy (ARPES) data. The underlying reason is that in multi-band models the self-energy is a matrix, not a scalar, and the result obtained from the ARPES analysis is a complicated function of all these self-energy matrix elements, weighted by different dipole matrix elements of the relevant Wannier orbitals. We contrast the results for Holstein and Peierls electron-phonon couplings to further illustrate differences between models with a local versus non-local self-energy matrix. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_03995 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Angle-resolved photoemission intensity for multi-orbital bands: Complex interplay between the self-energy matrix and the optical matrix elements Yam, Yau Chuen Berciu, Mona Sawayzky, George A. Strongly Correlated Electrons We use a simple one-dimensional two-band model with electron-phonon coupling to illustrate some of the complications that arise in multi-band systems when trying to extract a self-energy using the typical approach used for single-band systems when analyzing angle-resolved photoemission spectroscopy (ARPES) data. The underlying reason is that in multi-band models the self-energy is a matrix, not a scalar, and the result obtained from the ARPES analysis is a complicated function of all these self-energy matrix elements, weighted by different dipole matrix elements of the relevant Wannier orbitals. We contrast the results for Holstein and Peierls electron-phonon couplings to further illustrate differences between models with a local versus non-local self-energy matrix. |
| title | Angle-resolved photoemission intensity for multi-orbital bands: Complex interplay between the self-energy matrix and the optical matrix elements |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2508.03995 |