Momentum-resolved electronic structures and strong electronic correlations in graphene-like nitride superconductors
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866914814793613312 |
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| author | Bi, Jiachang Lin, Yu Zhang, Qinghua Liu, Zhanfeng Zhang, Ziyun Zhang, Ruyi Yao, Xiong Chen, Guoxin Liu, Haigang Huang, Yaobo Sun, Yuanhe Zhang, Hui Sun, Zhe Xiao, Shaozhu Cao, Yanwei |
| author_facet | Bi, Jiachang Lin, Yu Zhang, Qinghua Liu, Zhanfeng Zhang, Ziyun Zhang, Ruyi Yao, Xiong Chen, Guoxin Liu, Haigang Huang, Yaobo Sun, Yuanhe Zhang, Hui Sun, Zhe Xiao, Shaozhu Cao, Yanwei |
| contents | Although transition-metal nitrides have been widely applied for several decades, experimental investigations of their high-resolution electronic band structures are rare due to the lack of high-quality single-crystalline samples. Here, we report on the first momentum-resolved electronic band structures of titanium nitride (TiN) films, a remarkable nitride superconductor. The measurements of crystal structures and electrical transport properties confirmed the high quality of these films. More importantly, with a combination of high-resolution angle-resolved photoelectron spectroscopy and the first-principles calculations, the extracted Coulomb interaction strength of TiN films can be as large as 8.5 eV, whereas resonant photoemission spectroscopy yields a value of 6.26 eV. These large values of Coulomb interaction strength indicate that superconducting TiN is a strongly correlated system. Our results uncover the unexpected electronic correlations in transition-metal nitrides, potentially providing a perspective not only to understand their emergent quantum states but also to develop their applications in quantum devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_18150 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Momentum-resolved electronic structures and strong electronic correlations in graphene-like nitride superconductors Bi, Jiachang Lin, Yu Zhang, Qinghua Liu, Zhanfeng Zhang, Ziyun Zhang, Ruyi Yao, Xiong Chen, Guoxin Liu, Haigang Huang, Yaobo Sun, Yuanhe Zhang, Hui Sun, Zhe Xiao, Shaozhu Cao, Yanwei Materials Science Strongly Correlated Electrons Superconductivity Although transition-metal nitrides have been widely applied for several decades, experimental investigations of their high-resolution electronic band structures are rare due to the lack of high-quality single-crystalline samples. Here, we report on the first momentum-resolved electronic band structures of titanium nitride (TiN) films, a remarkable nitride superconductor. The measurements of crystal structures and electrical transport properties confirmed the high quality of these films. More importantly, with a combination of high-resolution angle-resolved photoelectron spectroscopy and the first-principles calculations, the extracted Coulomb interaction strength of TiN films can be as large as 8.5 eV, whereas resonant photoemission spectroscopy yields a value of 6.26 eV. These large values of Coulomb interaction strength indicate that superconducting TiN is a strongly correlated system. Our results uncover the unexpected electronic correlations in transition-metal nitrides, potentially providing a perspective not only to understand their emergent quantum states but also to develop their applications in quantum devices. |
| title | Momentum-resolved electronic structures and strong electronic correlations in graphene-like nitride superconductors |
| topic | Materials Science Strongly Correlated Electrons Superconductivity |
| url | https://arxiv.org/abs/2405.18150 |