Sublattice Dichotomy in Monolayer FeSe Superconductor

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...

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Bibliographic Details
Published in:arXiv.org 2024-06
Main Authors: Cui, Ding, Xu, Zhipeng, Jiao, Xiaotong, Hu, Qiyin, Zhao, Wenxuan, Yang, Lexian, Jiang, Kun, Jin-Feng, Jia, Wang, Lili, Hu, Jiangping, Qi-Kun Xue
Format: Article
Language:English
Subjects:
Coherence
Epitaxial growth
Iron
Molecular beam epitaxy
Monolayers
Substrates
Superconductors
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Summary: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 \(\alpha\) and \(\beta\) Fe sublattices, we find the coherence peak of \(\alpha\)-Fe at the inner gap \(+V_i\) is higher than \(\beta\)-Fe while the coherence peak of \(\beta\)-Fe at \(-V_i\) is higher than \(\alpha\)-Fe with a similar amount. We also observed a reversed effect at the outer gap \(\pm V_o\). We propose the \(\eta\)-pairing mechanism between \(k\) and \(-k+Q\) is the key mechanism for this unconventional sublattice dichotomy effect.
ISSN:2331-8422