@article{8d2b9ff00e5e409ca8206144fbd31b11,
title = "Uniform Diffusion of Cooper Pairing Mediated by Hole Carriers in Topological Sb2Te3/Nb",
abstract = "Spin-helical Dirac Fermions at a doped topological insulator{\textquoteright}s boundaries can support Majorana quasiparticles when coupled with s-wave superconductors, but in n-doped systems, the requisite induced Cooper pairing in topological states is often buried at heterointerfaces or complicated by degenerate coupling with bulk conduction carriers. Rarely probed are p-doped topological structures with nondegenerate Dirac and bulk valence bands at the Fermi level, which may foster long-range superconductivity without sacrificing Majorana physics. Using ultrahigh-resolution photoemission, we report proximity pairing with a large decay length in p-doped topological Sb2Te3 on superconducting Nb. Despite no momentum-space degeneracy, the topological and bulk states of Sb2Te3/Nb exhibit the same isotropic superconducting gaps at low temperatures. Our results unify principles for realizing accessible pairing in Dirac Fermions relevant to topological superconductivity.",
keywords = "Proximity effects, flip-chip method, interband superconducting coherence, p-doped topological insulators, thin-film heterostructures, topological superconductivity",
author = "Hlevyack, \{Joseph A.\} and Sahand Najafzadeh and Yao Li and Tsubaki Nagashima and Akifumi Mine and Yigui Zhong and Takeshi Suzuki and Akiko Fukushima and Lin, \{Meng Kai\} and \{Suresh Babu\}, Soorya and Jinwoong Hwang and Lee, \{Ji Eun\} and Mo, \{Sung Kwan\} and Eckstein, \{James N.\} and Shik Shin and Kozo Okazaki and Chiang, \{Tai Chang\}",
note = "This work was supported by the U.S. Department of Energy (DOE), Office of Science (OS), Office of Basic Energy Sciences, Division of Materials Science and Engineering, under Grant No. DE-FG02-07ER46383 (T.-C.C.), and by Grants-in-Aid for Scientific Research (KAKENHI) (Grant Nos. JP19H01818, JP19H00659, JP19H00651, JP24K01375, JP24K00565, and JP24KF0021) from the Japan Society for the Promotion of Science (JSPS), JSPS KAKENHI on Innovative Areas \textbackslash{}u201CQuantum Liquid Crystals\textbackslash{}u201D (Grant No. JP19H05826), and the Quantum Leap Flagship Program (Q-LEAP) (Grant No. JPMXS0118068681) from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) (K.O.). M.-K.L. acknowledges support from the National Science and Technology Council of Taiwan under Grant Nos. 110-2112-M-008-039-MY3 and 113-2112-M-008-035-MY3. We recognize that this work was partly carried out in the Central Research Facilities at the Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign. This research also used resources of the Advanced Light Source, which is a DOE Office of Science User Facility supported under Contract No. DE-AC02-05CH11231. This work was supported by the U.S. Department of Energy (DOE), Office of Science (OS), Office of Basic Energy Sciences, Division of Materials Science and Engineering, under Grant No. DE-FG02-07ER46383 (T.-C.C.), and by Grants-in-Aid for Scientific Research (KAKENHI) (Grant Nos. JP19H01818, JP19H00659, JP19H00651, JP24K01375, JP24K00565, and JP24KF0021) from the Japan Society for the Promotion of Science (JSPS), JSPS KAKENHI on Innovative Areas \textbackslash{}u201CQuantum Liquid Crystals\textbackslash{}u201D (Grant No. JP19H05826), and the Quantum Leap Flagship Program (Q-LEAP) (Grant No. JPMXS0118068681) from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) (K.O.). M.-K.L. acknowledges support from the National Science and Technology Council of Taiwan under Grant Nos. 110-2112-M-008-039-MY3 and 113-2112-M-008-035-MY3. We recognize that this work was partly carried out in the Central Research Facilities at the Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana\textbackslash{}u2013Champaign. This research also used resources of the Advanced Light Source, which is a DOE Office of Science User Facility supported under Contract No. DE-AC02-05CH11231. (1) U.S. Department of Energy (DOE), Office of Science (OS), Office of Basic Energy Sciences, Division of Materials Science and Engineering, under Grant No. DE-FG02-07ER46383. (2) Grants-in-Aid for Scientific Research (KAKENHI) (Grant Nos. JP19H01818, JP19H00659, JP19H00651, JP24K01375, JP24K00565, and JP24KF0021) from the Japan Society for the Promotion of Science (JSPS). (3) JSPS KAKENHI on Innovative Areas \textbackslash{}u201CQuantum Liquid Crystals\textbackslash{}u201D (Grant No. JP19H05826). (4) Quantum Leap Flagship Program (Q-LEAP) (Grant No. JPMXS0118068681) from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT). (5) National Science and Technology Council of Taiwan under Grant Nos. 110-2112-M-008-039-MY3 and 113-2112-M-008-035-MY3. (6) DOE Office of Science User Facility supported under Contract No. DE-AC02-05CH11231.",
year = "2024",
month = nov,
day = "12",
doi = "10.1021/acsnano.4c10533",
language = "English (US)",
volume = "18",
pages = "31323--31331",
journal = "ACS Nano",
issn = "1936-0851",
publisher = "American Chemical Society",
number = "45",
}