@article{01e3693fbf1a431b809989a6e20768a1,
title = "Coexistence of Bulk-Nodal and Surface-Nodeless Cooper Pairings in a Superconducting Dirac Semimetal",
abstract = "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 Tc∼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.",
author = "Yang, {Xian P.} and Yigui Zhong and Sougata Mardanya and Cochran, {Tyler A.} and Ramakanta Chapai and Akifumi Mine and Junyi Zhang and Jaime S{\'a}nchez-Barriga and Cheng, {Zi Jia} and Clark, {Oliver J.} and Yin, {Jia Xin} and Joanna Blawat and Guangming Cheng and Ilya Belopolski and Tsubaki Nagashima and Sahand Najafzadeh and Shiyuan Gao and Nan Yao and Arun Bansil and Rongying Jin and Chang, {Tay Rong} and Shik Shin and Kozo Okazaki and Hasan, {M. Zahid}",
note = "Funding Information: The authors thank D. Lu and M. Hashimoto at beamline 5-2 of the Stanford Synchrotron Radiation Lightsource (SSRL) at the SLAC National Accelerator Laboratory, CA, USA for support. The authors acknowledge enlightening discussions with X. Wu. Work at Princeton University is supported by the Gordon and Betty Moore Foundation (Grants No. GBMF4547 and No. GBMF9461; M. Z. H.). The ARPES work is supported by the United States Department of Energy (US DOE) under the Basic Energy Sciences program (Grant No. DOE/BES DE-FG-02-05ER46200; M. Z. H.). Materials characterization and the study of topological quantum properties are supported by the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Quantum Science Center and Princeton University. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515. Laser ARPES measurements in University of Tokyo are supported by Grants-in-Aid for Scientific Research (KAKENHI) (Grants No. JP19H01818 and No. JP19H00651) from the Japan Society for the Promotion of Science (JSPS) and by JSPS KAKENHI on Innovative Areas “Quantum Liquid Crystals” (Grants No. JP19H05826). We thank HZB for the allocation of synchrotron radiation beamtime at the U125-2-PGM beamline of BESSY II. J. S.-B. acknowledges financial support from the Impuls-und Vernetzungsfonds der Helmholtz-Gemeinschaft under Grant No. HRSF-0067. Crystal growth and characterization (R. C., J. B., R. J.) are supported by NSF DMR-1504226. STEM characterization is performed with the use of Princeton University{\textquoteright}s Imaging and Analysis Center, which is partially supported by the Princeton Center for Complex Materials (PCCM), a National Science Foundation (NSF)-MRSEC program (DMR-2011750). T.-R. C. is supported by the Young Scholar Fellowship Program from the Ministry of Science and Technology (MOST) in Taiwan, under a MOST grant for the Columbus Program MOST110-2636-M-006-016, National Cheng Kung University, Taiwan, and National Center for Theoretical Sciences, Taiwan. This work is supported partially by the MOST, Taiwan, grant MOST107-2627-E-006-001. This research is supported in part by Higher Education Sprout Project, Ministry of Education to the Headquarters of University Advancement at National Cheng Kung University (NCKU). J. Z. and S. G. are supported as part of the Institute for Quantum Matter, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences under Award No. DE-SC0019331. The work at Northeastern University is supported by the Air Force Office of Scientific Research under Award No. FA9550-20-1-0322, and it benefits from the computational resources of Northeastern University{\textquoteright}s Advanced Scientific Computation Center (ASCC) and the Discovery Cluster. T. A. C. acknowledges the support of the National Science Foundation Graduate Research Fellowship Program (DGE-1656466). I. B. acknowledges the generous support of the Special Postdoctoral Researchers Program, RIKEN during the late stages of this work. M. Z. H. acknowledges support from Lawrence Berkeley National Laboratory and the Miller Institute of Basic Research in Science at the University of California, Berkeley in the form of a Visiting Miller Professorship. M. Z. H. also acknowledges support from the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Quantum Science Center. Publisher Copyright: {\textcopyright} 2023 American Physical Society.",
year = "2023",
month = jan,
day = "27",
doi = "10.1103/PhysRevLett.130.046402",
language = "English (US)",
volume = "130",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "4",
}