"Quantum bipolaron" superconductivity from quadratic electron-phonon coupling
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2023
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| _version_ | 1866909317978914816 |
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| author | Han, Zhaoyu Kivelson, Steven A. Volkov, Pavel A. |
| author_facet | Han, Zhaoyu Kivelson, Steven A. Volkov, Pavel A. |
| contents | When the electron-phonon coupling is quadratic in the phonon coordinates, electrons can pair to form bipolarons due to phonon zero-point fluctuations, a purely quantum effect. We study superconductivity originating from this pairing mechanism in a minimal model and reveal that, in the strong coupling regime, the critical temperature ($T_c$) is only mildly suppressed by the coupling strength, in stark contrast to the exponential suppression in linearly coupled systems, thus implying higher optimal $T_c$ values. We demonstrate that large coupling constants of this flavor are achieved in known materials such as perovskites, and discuss strategies to realize such superconductivity using superlattices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_03844 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | "Quantum bipolaron" superconductivity from quadratic electron-phonon coupling Han, Zhaoyu Kivelson, Steven A. Volkov, Pavel A. Superconductivity When the electron-phonon coupling is quadratic in the phonon coordinates, electrons can pair to form bipolarons due to phonon zero-point fluctuations, a purely quantum effect. We study superconductivity originating from this pairing mechanism in a minimal model and reveal that, in the strong coupling regime, the critical temperature ($T_c$) is only mildly suppressed by the coupling strength, in stark contrast to the exponential suppression in linearly coupled systems, thus implying higher optimal $T_c$ values. We demonstrate that large coupling constants of this flavor are achieved in known materials such as perovskites, and discuss strategies to realize such superconductivity using superlattices. |
| title | "Quantum bipolaron" superconductivity from quadratic electron-phonon coupling |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2312.03844 |