| Title | Proximity-induced surface superconductivity in Dirac semimetal Cd3As2 |
| Authors | Huang, Ce Zhou, Benjamin T. Zhang, Huiqin Yang, Bingjia Liu, Ran Wang, Hanwen Wan, Yimin Huang, Ke Liao, Zhiming Zhang, Enze Liu, Shanshan Deng, Qingsong Chen, Yanhui Han, Xiaodong Zou, Jin Lin, Xi Han, Zheng Wang, Yihua Law, Kam Tuen Xiu, Faxian |
| Affiliation | Fudan Univ, State Key Lab Surface Phys, Shanghai 200433, Peoples R China Fudan Univ, Dept Phys, Shanghai 200433, Peoples R China Fudan Univ, Inst Nanoelect Devices & Quantum Comp, Shanghai 200433, Peoples R China Hong Kong Univ Sci & Technol, Dept Phys, Clear Water Bay, Hong Kong, Peoples R China Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Liaoning, Peoples R China Peking Univ, Int Ctr Quantum Mat, Beijing 100871, Peoples R China Univ Queensland, Mat Engn, Brisbane, Qld 4072, Australia Univ Technol, Inst Microstruct & Property Adv Mat, Beijing Key Lab Microstruct & Property Adv Mat, Beijing 100124, Peoples R China Univ Queensland, Ctr Microscopy & Microanal, Brisbane, Qld 4072, Australia Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Jiangsu, Peoples R China |
| Issue Date | 2019 |
| Publisher | NATURE COMMUNICATIONS |
| Abstract | Cd3As2 is a three-dimensional Dirac semimetal with separated Dirac points in momentum space. In spite of extensive transport and spectroscopic studies on its exotic properties, the evidence of superconductivity in its surface states remains elusive. Here, we report the observation of proximity-induced surface superconductivity in Nb/Cd3As2 hybrid structures. Our four-terminal transport measurement identifies a pronounced proximity-induced pairing gap (gap size comparable to Nb) on the surfaces, which exhibits a flat conductance plateau in differential conductance spectra, consistent with our theoretical simulations. The surface supercurrent from Nb/Cd3As2/Nb junctions is also achieved with a Fraunhofer/SQUID-like pattern under out-of-plane/in-plane magnetic fields, respectively. The resultant mapping shows a predominant distribution on the top and bottom surfaces as the bulk carriers are depleted, which can be regarded as a higher dimensional analog of edge supercurrent in two-dimensional quantum spin Hall insulators. Our study provides the evidence of surface superconductivity in Dirac semimetals. |
| URI | http://hdl.handle.net/20.500.11897/548236 |
| ISSN | 2041-1723 |
| DOI | 10.1038/s41467-019-10233-w |
| Indexed | SCI(E) EI |
| Appears in Collections: | 量子材料科学中心 |
