Coexistence of Bulk-Nodal and Surface-Nodeless Cooper Pairings in a Superconducting Dirac Semimetal

The interplay of nontrivial topology and superconductivity in condensed matter physics gives rise to exotic phenomena. However, materials are extremely rare where it is possible to explore the full details of the superconducting pairing. Here, we investigate the momentum dependence of the supercondu...

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Bibliographic Details
Published in:Physical review letters 2023-01, Vol.130 (4), p.046402-046402, Article 046402
Main Authors: Yang, Xian P, Zhong, Yigui, Mardanya, Sougata, Cochran, Tyler A, Chapai, Ramakanta, Mine, Akifumi, Zhang, Junyi, Sánchez-Barriga, Jaime, Cheng, Zi-Jia, Clark, Oliver J, Yin, Jia-Xin, Blawat, Joanna, Cheng, Guangming, Belopolski, Ilya, Nagashima, Tsubaki, Najafzadeh, Sahand, Gao, Shiyuan, Yao, Nan, Bansil, Arun, Jin, Rongying, Chang, Tay-Rong, Shin, Shik, Okazaki, Kozo, Hasan, M Zahid
Format: Article
Language:English
Subjects:
Angle-resolved photoemission spectroscopy
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Condensed Matter, Materials & Applied Physics
Dirac semimetal
Electrical properties
Fermi surface
First-principles calculations
Superconducting gap
Tight-binding model
Topological materials
Topological superconductors
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Summary:The interplay of nontrivial topology and superconductivity in condensed matter physics gives rise to exotic phenomena. However, materials are extremely rare where it is possible to explore the full details of the superconducting pairing. Here, we investigate the momentum dependence of the superconducting gap distribution in a novel Dirac material PdTe. Using high resolution, low temperature photoemission spectroscopy, we establish it as a spin-orbit coupled Dirac semimetal with the topological Fermi arc crossing the Fermi level on the (010) surface. This spin-textured surface state exhibits a fully gapped superconducting Cooper pairing structure below T_{c}∼4.5  K. Moreover, we find a node in the bulk near the Brillouin zone boundary, away from the topological Fermi arc. These observations not only demonstrate the band resolved electronic correlation between topological Fermi arc states and the way it induces Cooper pairing in PdTe, but also provide a rare case where surface and bulk states host a coexistence of nodeless and nodal gap structures enforced by spin-orbit coupling.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.130.046402