ARPES Detection of Superconducting Gap Sign in Unconventional Superconductors
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arXiv
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866913377216888832 |
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| author | Gao, Qiang Bok, Jin Mo Ai, Ping Liu, Jing Yan, Hongtao Luo, Xiangyu Cai, Yongqing Li, Cong Wang, Yang Yin, Chaohui Chen, Hao Gu, Genda Zhang, Fengfeng Yang, Feng Zhang, Shenjin Peng, Qinjun Zhu, Zhihai Liu, Guodong Xu, Zuyan Xiang, Tao Zhao, Lin Choi, Han-Yong Zhou, X. J. |
| author_facet | Gao, Qiang Bok, Jin Mo Ai, Ping Liu, Jing Yan, Hongtao Luo, Xiangyu Cai, Yongqing Li, Cong Wang, Yang Yin, Chaohui Chen, Hao Gu, Genda Zhang, Fengfeng Yang, Feng Zhang, Shenjin Peng, Qinjun Zhu, Zhihai Liu, Guodong Xu, Zuyan Xiang, Tao Zhao, Lin Choi, Han-Yong Zhou, X. J. |
| contents | Superconductivity is realized by opening a gap in the superconducting state. The gap symmetry is crucial in understanding the underlying superconductivity mechanism. The magnitude and the phase are essential in fully characterizing the superconducting gap. Angle-resolved photoemission spectroscopy (ARPES) has played a key role in determining the gap symmetry in unconventional superconductors. However, it has been considered so far that ARPES can only measure the magnitude of the superconducting gap but not its phase; the phase has to be detected by other phase-sensitive techniques. Here we propose a new method to directly detect the superconducting gap sign by using ARPES. This method is successfully validated in a cuprate superconductor with a well-known $d$-wave gap symmetry. When two bands are nearby in momentum space and have a strong interband interaction, the resulted electronic structures in the superconducting state are sensitive to the relative gap sign between the two bands which can be captured by ARPES measurements. Our present work provides a new way to detect the gap sign and can be applied to various superconductors, particularly those with multiple orbitals like the iron-based superconductors. It also makes ARPES more powerful to determine both the gap magnitude and the phase that are significant in understanding the superconductivity mechanism of unconventional superconductors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2307_16384 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | ARPES Detection of Superconducting Gap Sign in Unconventional Superconductors Gao, Qiang Bok, Jin Mo Ai, Ping Liu, Jing Yan, Hongtao Luo, Xiangyu Cai, Yongqing Li, Cong Wang, Yang Yin, Chaohui Chen, Hao Gu, Genda Zhang, Fengfeng Yang, Feng Zhang, Shenjin Peng, Qinjun Zhu, Zhihai Liu, Guodong Xu, Zuyan Xiang, Tao Zhao, Lin Choi, Han-Yong Zhou, X. J. Superconductivity Strongly Correlated Electrons Superconductivity is realized by opening a gap in the superconducting state. The gap symmetry is crucial in understanding the underlying superconductivity mechanism. The magnitude and the phase are essential in fully characterizing the superconducting gap. Angle-resolved photoemission spectroscopy (ARPES) has played a key role in determining the gap symmetry in unconventional superconductors. However, it has been considered so far that ARPES can only measure the magnitude of the superconducting gap but not its phase; the phase has to be detected by other phase-sensitive techniques. Here we propose a new method to directly detect the superconducting gap sign by using ARPES. This method is successfully validated in a cuprate superconductor with a well-known $d$-wave gap symmetry. When two bands are nearby in momentum space and have a strong interband interaction, the resulted electronic structures in the superconducting state are sensitive to the relative gap sign between the two bands which can be captured by ARPES measurements. Our present work provides a new way to detect the gap sign and can be applied to various superconductors, particularly those with multiple orbitals like the iron-based superconductors. It also makes ARPES more powerful to determine both the gap magnitude and the phase that are significant in understanding the superconductivity mechanism of unconventional superconductors. |
| title | ARPES Detection of Superconducting Gap Sign in Unconventional Superconductors |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2307.16384 |