Effects of phonon dispersion on the bond-bipolaron superconductivity
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866917781738356736 |
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| author | Zhang, Chao Prokof'ev, Nikolay Svistunov, Boris |
| author_facet | Zhang, Chao Prokof'ev, Nikolay Svistunov, Boris |
| contents | We employ the diagrammatic Monte Carlo method based on lattice path-integral representaion of the particle sector and real-space diagrammatics of the phonon sector to study effects of optical phonon dispersion on Bose-Einstein condensation of bipolarons in the bond model. For dispersionless phonons with frequency $ω$ this model was recently shown to give rise to small-size, light-mass bipolarons that undergo a superfluid transition at high values of the $T_c/ω$ ratio. We find that for dispersive phonons, $T_c$ remains relatively high over a broader range of the coupling strength and even keeps increasing in the deep adiabatic regime both in two and three dimensions. This result implies that phonon dispersion is not a limiting factor in the search for new materials with high superconducting temperatures. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2409_14132 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Effects of phonon dispersion on the bond-bipolaron superconductivity Zhang, Chao Prokof'ev, Nikolay Svistunov, Boris Strongly Correlated Electrons We employ the diagrammatic Monte Carlo method based on lattice path-integral representaion of the particle sector and real-space diagrammatics of the phonon sector to study effects of optical phonon dispersion on Bose-Einstein condensation of bipolarons in the bond model. For dispersionless phonons with frequency $ω$ this model was recently shown to give rise to small-size, light-mass bipolarons that undergo a superfluid transition at high values of the $T_c/ω$ ratio. We find that for dispersive phonons, $T_c$ remains relatively high over a broader range of the coupling strength and even keeps increasing in the deep adiabatic regime both in two and three dimensions. This result implies that phonon dispersion is not a limiting factor in the search for new materials with high superconducting temperatures. |
| title | Effects of phonon dispersion on the bond-bipolaron superconductivity |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2409.14132 |