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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2507.14345 |
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| _version_ | 1866911385654394880 |
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| author | Taufertshöfer, Nora Zema, Vanessa Catena, Riccardo Olevano, Valerio Spaldin, Nicola A. |
| author_facet | Taufertshöfer, Nora Zema, Vanessa Catena, Riccardo Olevano, Valerio Spaldin, Nicola A. |
| contents | We determine whether excitonic effects affect predictions of dark matter (DM)-electron scattering rates by calculating the energy- and momentum-dependent energy-loss function, including electron-hole interaction excitonic effects, for the dark-matter scintillating detector materials GaAs and NaI. By comparing our results using the Bethe-Salpeter equation in the framework of many-body perturbation theory, which explicitly includes excitonic effects, with those using the quasiparticle random-phase approximation, which includes only electron-electron interaction and crystal local-field effects, we find that excitonic effects in NaI significantly increase the predicted scattering rate at low energy and as a result improve the cross-section sensitivity considering a realistic background. In contrast, the predicted scattering rate and the DM-electron scattering cross-section for GaAs are minimally affected by excitonic effects. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_14345 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Excitonic contributions to dark matter-electron scattering Taufertshöfer, Nora Zema, Vanessa Catena, Riccardo Olevano, Valerio Spaldin, Nicola A. High Energy Physics - Phenomenology Materials Science We determine whether excitonic effects affect predictions of dark matter (DM)-electron scattering rates by calculating the energy- and momentum-dependent energy-loss function, including electron-hole interaction excitonic effects, for the dark-matter scintillating detector materials GaAs and NaI. By comparing our results using the Bethe-Salpeter equation in the framework of many-body perturbation theory, which explicitly includes excitonic effects, with those using the quasiparticle random-phase approximation, which includes only electron-electron interaction and crystal local-field effects, we find that excitonic effects in NaI significantly increase the predicted scattering rate at low energy and as a result improve the cross-section sensitivity considering a realistic background. In contrast, the predicted scattering rate and the DM-electron scattering cross-section for GaAs are minimally affected by excitonic effects. |
| title | Excitonic contributions to dark matter-electron scattering |
| topic | High Energy Physics - Phenomenology Materials Science |
| url | https://arxiv.org/abs/2507.14345 |