High-temperature superconductivity induced by the Su-Schrieffer-Heeger electron-phonon coupling
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866918430201872384 |
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| author | Cai, Xun Li, Zi-Xiang Yao, Hong |
| author_facet | Cai, Xun Li, Zi-Xiang Yao, Hong |
| contents | Experimental quest for high-temperature and room-temperature superconductivity (SC) at ambient pressure has been a long-standing research theme in physics. It has also been desired to construct reliable microscopic mechanisms that may achieve high-temperature SC. Here we systematically explore SC in the Su-Schrieffer-Heeger (SSH) electron-phonon coupling models by performing numerically-exact quantum Monte-Carlo simulations. Our results reliably showed that superconducting $T_c$ of the SSH models is high, remarkably higher than those in the Holstein models, particularly in strong electron-phonon coupling regime. This is mainly because SSH phonons can not only induce strong pairing between electrons but also help the phase coherence of Cooper pairs, thus realizing higher $T_c$. As mechanism of higher-$T_c$ of the SSH models could be potentially relevant to realistic materials, it paves a promising way to find higher-temperature SC in the future. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2308_06222 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | High-temperature superconductivity induced by the Su-Schrieffer-Heeger electron-phonon coupling Cai, Xun Li, Zi-Xiang Yao, Hong Strongly Correlated Electrons Superconductivity Experimental quest for high-temperature and room-temperature superconductivity (SC) at ambient pressure has been a long-standing research theme in physics. It has also been desired to construct reliable microscopic mechanisms that may achieve high-temperature SC. Here we systematically explore SC in the Su-Schrieffer-Heeger (SSH) electron-phonon coupling models by performing numerically-exact quantum Monte-Carlo simulations. Our results reliably showed that superconducting $T_c$ of the SSH models is high, remarkably higher than those in the Holstein models, particularly in strong electron-phonon coupling regime. This is mainly because SSH phonons can not only induce strong pairing between electrons but also help the phase coherence of Cooper pairs, thus realizing higher $T_c$. As mechanism of higher-$T_c$ of the SSH models could be potentially relevant to realistic materials, it paves a promising way to find higher-temperature SC in the future. |
| title | High-temperature superconductivity induced by the Su-Schrieffer-Heeger electron-phonon coupling |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2308.06222 |