Gate modulation of anisotropic superconductivity in Al–Dirac semimetal Cd3As2 nanoplate–Al Josephson junctions. (1st April 2022)

• Record Type: Journal Article
• Authors: Li, Na; Tan, Zhen-Bing; Chen, Jing-Jing; Zhao, Tong-Yang; Chu, Chun-Guang; Wang, An-Qi; Pan, Zhen-Cun; Yu, Dapeng; Liao, Zhi-Min
• Is Part Of: Superconductor science & technology. Volume 35:Number 4(2022)
• Publication Date: 2022-04-01
• Subjects: Josephson junction -- Dirac semimetal -- gate modulation -- anisotropic superconductivity -- magnetic response; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/1361-6668/ac4c84
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: Three-dimensional Dirac semimetal Cd3 As2, hosting a pair of Dirac cones and Fermi arc-like surface states, displays numerous exotic properties in transport experiments. In particular, when proximitized with a superconductor, Cd3 As2 is expected to realize topological superconductivity and Majorana zero modes, which are essential for fault-tolerant quantum computing. Here, using electronic transport measurements on superconductor Al–Cd3 As2 nanoplate–Al heterostructures, we investigate the effect of gate modulation and magnetic field on the superconducting properties of Cd3 As2 . A proximity-induced superconducting state is well achieved in the junction, which can be effectively tuned by the gate voltage. The critical current oscillations under out-of-plane magnetic fields are well fitted with the Fraunhofer function. The critical supercurrent shows a slower decay as the gate voltage is tuned to negative under in-plane magnetic fields, which may arise from the enhanced contribution of surface states. Anisotropic superconductivity is also observed with in-plane rotating magnetic fields. Our results report the gate modulation of supercurrents in different magnetic field directions, which should be valuable for further exploring the topological superconductivity in Dirac semimetals.