ARPES detection of superconducting gap sign in unconventional superconductors
The superconducting gap symmetry is crucial in understanding the underlying superconductivity mechanism. 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 on...
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Published in | Nature communications Vol. 15; no. 1; p. 4538 |
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Main Authors | , , , , , , , , , , , , , , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
England
Nature Publishing Group
28.05.2024
Nature Publishing Group UK Nature Portfolio |
Subjects | |
Online Access | Get full text |
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Summary: | The superconducting gap symmetry is crucial in understanding the underlying superconductivity mechanism. 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 method to directly detect the superconducting gap sign by ARPES. This method is successfully validated in a cuprate superconductor Bi
Sr
CaCu
O
with a well-known d-wave gap symmetry. When two bands have a strong interband interaction, the resulted electronic structures in the superconducting state are sensitive to the relative gap sign between the two bands. Our present work provides an approach to detect the gap sign and can be applied to various superconductors, particularly those with multiple orbitals like the iron-based superconductors. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 BNL-225807-2024-JAAM SC0012704; 2021YFA1401800; 2017YFA0302900; 2018YFA0305600; 2018YFA0704200; 2019YFA0308000; 2022YFA1604200; 2022YFA1403900; 11888101; 11922414; 11974404; 12074411; XDB25000000; XDB33000000; 2021ZD0301800; Y2021006; NRF-2022R1C1C2008671 National Research Foundation of Korea (NRF) Chinese Academy of Sciences (CAS) USDOE Office of Science (SC), Basic Energy Sciences (BES) National Natural Science Foundation of China (NSFC) National Key Research and Development Program of China Innovation Program for Quantum Science and Technology |
ISSN: | 2041-1723 2041-1723 |
DOI: | 10.1038/s41467-024-48610-9 |