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

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

doi:10.1103/physrevlett.130.046402

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

Journal Article · Wed Jan 25 00:00:00 EST 2023 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.130.046402· OSTI ID:2282495

^[1]; Zhong, Yigui ^[2]; Mardanya, Sougata ^[3]; Cochran, Tyler A. ^[1]; Chapai, Ramakanta ^[4];

^[2];

^[5];

^[6]; Cheng, Zi-Jia ^[1];

^[7]; Yin, Jia-Xin ^[8]; Blawat, Joanna ^[9];

^[1]; Belopolski, Ilya ^[1]; Nagashima, Tsubaki ^[2]; Najafzadeh, Sahand ^[2]; Gao, Shiyuan ^[5];

^[1]; Bansil, Arun ^[10];

^[9] more »

Princeton University, NJ (United States)
University of Tokyo, Chiba (Japan)
National Cheng Kung University, Tainan (Taiwan)
Louisiana State University, Baton Rouge, LA (United States)
Johns Hopkins University, Baltimore, MD (United States)
Helmholtz-Zentrum Berlin (HZB), (Germany). German Research Centre for Materials and Energy; Campus de Cantoblanco, Madrid (Spain)
Helmholtz-Zentrum Berlin (HZB), (Germany). German Research Centre for Materials and Energy
Southern University of Science and Technology, Shenzhen (China)
Louisiana State University, Baton Rouge, LA (United States); University of South Carolina, Columbia, SC (United States)
Northeastern University, Boston, MA (United States)
National Cheng Kung University, Tainan (Taiwan); Center for Quantum Frontiers of Research and Technology (QFort), Tainan (Taiwan); National Center for Theoretical Sciences, Taipei (Taiwan)
University of Tokyo, Chiba (Japan); University of Tokyo (Japan)
Princeton University, NJ (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

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. In conclusion, 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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Gordon and Betty Moore Foundation (GBMF); Japan Society for the Promotion of Science (JSPS); National Science Foundation (NSF); US Air Force Office of Scientific Research (AFOSR); Ministry of Science and Technology (MOST)

Grant/Contract Number:: AC02-05CH11231; AC02-76SF00515; FG02-05ER46200; SC0019331; FA9550-20-1-0322; MOST110-2636-M-006-016; MOST107-2627-E-006-001; DGE-1656466; DMR-2011750; DMR-1504226; JP19H05826; JP19H01818; JP19H00651; GBMF4547; GBMF9461

OSTI ID:: 2282495

Journal Information:: Physical Review Letters, Vol. 130, Issue 4; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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

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