Sublattice Dichotomy in Monolayer FeSe Superconductor
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arXiv
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| Autores principales: | , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| Materias: | |
| Acceso en línea: | |
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| _version_ | 1866915888125444096 |
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| author | Ding, Cui Xu, Zhipeng Jiao, Xiaotong Hu, Yinqi Zhao, Wenxuan Yang, Lexian Jiang, Kun Wang, Lili Jia, Jin-Feng Hu, Jiangping Xue, Qi-Kun |
| author_facet | Ding, Cui Xu, Zhipeng Jiao, Xiaotong Hu, Yinqi Zhao, Wenxuan Yang, Lexian Jiang, Kun Wang, Lili Jia, Jin-Feng Hu, Jiangping Xue, Qi-Kun |
| contents | The pairing mechanism behind the monolayer FeSe is one essential question for iron-based superconductors. In this work, we show the sublattice degree of freedoms of monolayer FeSe plays a special role in its pairing properties, namely the sublattice dichotomy. The high-quality monolayer FeSe samples with atomic flat $1\times1$ topography on the SrTiO$_3$(001) substrates are grown by molecular beam epitaxy. By comparing the tunneling spectra at $α$ and $β$ Fe sublattices, we find the coherence peak of $α$-Fe at the inner gap $+V_i$ is higher than $β$-Fe while the coherence peak of $β$-Fe at $-V_i$ is higher than $α$-Fe with a similar amount. We also observed a reversed effect at the outer gap $\pm V_o$. We propose the $η$-pairing mechanism between $k$ and $-k+Q$ is the key mechanism for this unconventional sublattice dichotomy effect. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_15239 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Sublattice Dichotomy in Monolayer FeSe Superconductor Ding, Cui Xu, Zhipeng Jiao, Xiaotong Hu, Yinqi Zhao, Wenxuan Yang, Lexian Jiang, Kun Wang, Lili Jia, Jin-Feng Hu, Jiangping Xue, Qi-Kun Superconductivity Materials Science Strongly Correlated Electrons The pairing mechanism behind the monolayer FeSe is one essential question for iron-based superconductors. In this work, we show the sublattice degree of freedoms of monolayer FeSe plays a special role in its pairing properties, namely the sublattice dichotomy. The high-quality monolayer FeSe samples with atomic flat $1\times1$ topography on the SrTiO$_3$(001) substrates are grown by molecular beam epitaxy. By comparing the tunneling spectra at $α$ and $β$ Fe sublattices, we find the coherence peak of $α$-Fe at the inner gap $+V_i$ is higher than $β$-Fe while the coherence peak of $β$-Fe at $-V_i$ is higher than $α$-Fe with a similar amount. We also observed a reversed effect at the outer gap $\pm V_o$. We propose the $η$-pairing mechanism between $k$ and $-k+Q$ is the key mechanism for this unconventional sublattice dichotomy effect. |
| title | Sublattice Dichotomy in Monolayer FeSe Superconductor |
| topic | Superconductivity Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2406.15239 |