Superconductivity due to cooperation of electron-electron and electron-phonon interactions at quarter filling
Existing theories of superconductivity emphasize either electron-electron or electron-phonon interaction, each of which tends to cancel the effect of the other. We present direct evidence from unbiased numerical calculations of cooperative, as opposed to competing, effects of electron-electron and e...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2020-04-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.2.023006 |
| Summary: | Existing theories of superconductivity emphasize either electron-electron or electron-phonon interaction, each of which tends to cancel the effect of the other. We present direct evidence from unbiased numerical calculations of cooperative, as opposed to competing, effects of electron-electron and electron-phonon interactions within the frustrated Hubbard Hamiltonian with bond-coupled phonons, uniquely at the band filling of one-quarter. The two interactions cooperatively reinforce d-wave superconducting pair-pair correlations at this filling while competing with one another at all other densities. Our work gives insight into how intertwined charge order and superconductivity appear in real materials. |
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| ISSN: | 2643-1564 |