Method for reconstructing the self-energy from the spectral function
Fuente:
arXiv
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| Autore principale: | |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866912081097261056 |
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| author | Shastry, B Sriram |
| author_facet | Shastry, B Sriram |
| contents | A fundamental question about the nature of quantum materials such as High-T$_c$ systems remain open to date -- it is unclear whether they are (some variety of) Fermi liquids, or (some variety of) non Fermi liquids. A direct avenue to determine their nature is to study the (imaginary part of the) self-energy at low energies. Here we present a novel method to extract this low $ω$ self-energy from experimentally derived spectral functions. The method seems suited for implementation with high quality angle resolved photoemission data. It is based on a helpful Theorem proposed here, which assures us that the method has minimal (or vanishing) error at the lowest energies. We provide numerical examples showing that a few popular model systems yield distinguishably different low energy self-energies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_07682 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Method for reconstructing the self-energy from the spectral function Shastry, B Sriram Strongly Correlated Electrons Superconductivity A fundamental question about the nature of quantum materials such as High-T$_c$ systems remain open to date -- it is unclear whether they are (some variety of) Fermi liquids, or (some variety of) non Fermi liquids. A direct avenue to determine their nature is to study the (imaginary part of the) self-energy at low energies. Here we present a novel method to extract this low $ω$ self-energy from experimentally derived spectral functions. The method seems suited for implementation with high quality angle resolved photoemission data. It is based on a helpful Theorem proposed here, which assures us that the method has minimal (or vanishing) error at the lowest energies. We provide numerical examples showing that a few popular model systems yield distinguishably different low energy self-energies. |
| title | Method for reconstructing the self-energy from the spectral function |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2408.07682 |