Photoinduced $η$-pairing correlation in the Hubbard ladder
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| _version_ | 1866916122977107968 |
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| author | Ueda, Ryota Kuroki, Kazuhiko Kaneko, Tatsuya |
| author_facet | Ueda, Ryota Kuroki, Kazuhiko Kaneko, Tatsuya |
| contents | We investigate the staggered correlation of the on-site pairs, the so-called $η$-pairing correlation, induced by pump electric fields in the Hubbard model on the ladder lattice. Employing the time-evolution method based on exact diagonalization, we compute the photoinduced $η$-pairing correlation with different strengths of the interchain hopping. When the pump field is polarized along the chain direction, the $η$-pairing correlation is noticeably induced in the weakly coupled double-chain region, where the pairing property is similar to the $η$ pairing in the single-chain Hubbard model. On the other hand, the pump field polarized along the rung direction prominently induces the $η$-pairing correlation in the strong interchain coupling regime, where the pair correlations developing across rungs strongly contribute to the $η$ pairing. Based on the local rung approximation, which is valid in the strong interchain coupling regime, we discuss the origin of the photoinduced pair. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_10153 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Photoinduced $η$-pairing correlation in the Hubbard ladder Ueda, Ryota Kuroki, Kazuhiko Kaneko, Tatsuya Strongly Correlated Electrons Superconductivity We investigate the staggered correlation of the on-site pairs, the so-called $η$-pairing correlation, induced by pump electric fields in the Hubbard model on the ladder lattice. Employing the time-evolution method based on exact diagonalization, we compute the photoinduced $η$-pairing correlation with different strengths of the interchain hopping. When the pump field is polarized along the chain direction, the $η$-pairing correlation is noticeably induced in the weakly coupled double-chain region, where the pairing property is similar to the $η$ pairing in the single-chain Hubbard model. On the other hand, the pump field polarized along the rung direction prominently induces the $η$-pairing correlation in the strong interchain coupling regime, where the pair correlations developing across rungs strongly contribute to the $η$ pairing. Based on the local rung approximation, which is valid in the strong interchain coupling regime, we discuss the origin of the photoinduced pair. |
| title | Photoinduced $η$-pairing correlation in the Hubbard ladder |
| topic | Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2310.10153 |