Fermi-arc supercurrent oscillations in Dirac semimetal Josephson junctions

Li，Cai Zhen1,2; Wang，An Qi3; Li，Chuan4; Zheng，Wen Zhuang1; Brinkman，Alexander4; Yu，Da Peng2; Liao，Zhi Min1,5,6

2020-12-01

10.1038/s41467-020-15010-8

Nature Communications   影响因子和分区

2041-1723

2041-1723

One prominent hallmark of topological semimetals is the existence of unusual topological surface states known as Fermi arcs. Nevertheless, the Fermi-arc superconductivity remains elusive. Here, we report the critical current oscillations from surface Fermi arcs in Nb-Dirac semimetal CdAs-Nb Josephson junctions. The supercurrent from bulk states are suppressed under an in-plane magnetic field ~0.1 T, while the supercurrent from the topological surface states survives up to 0.5 T. Contrary to the minimum normal-state conductance, the Fermi-arc carried supercurrent shows a maximum critical value near the Dirac point, which is consistent with the fact that the Fermi arcs have maximum density of state at the Dirac point. Moreover, the critical current exhibits periodic oscillations with a parallel magnetic field, which is well understood by considering the in-plane orbital effect from the surface states. Our results suggest the Dirac semimetal combined with superconductivity should be promising for topological quantum devices.

SCI

英语

NI期刊

其他

NSFC[91964201] ; NSFC[61825401] ; NSFC[11774004]

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:000520939200010

NATURE PUBLISHING GROUP

2-s2.0-85080863359

Scopus

1.State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics,School of Physics,Peking University,Beijing,100871,China
2.Shenzhen Institute for Quantum Science and Engineering and Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China
3.Academy for Advanced Interdisciplinary Studies,Peking University,Beijing,100871,China
4.MESA+ Institute for Nanotechnology,University of Twente,Enschede,7500 AE,Netherlands
5.Beijing Key Laboratory of Quantum Devices,Peking University,Beijing,100871,China
6.Collaborative Innovation Center of Quantum Matter,Peking University,Beijing,100871,China

Li，Cai Zhen,Wang，An Qi,Li，Chuan,et al. Fermi-arc supercurrent oscillations in Dirac semimetal Josephson junctions[J]. Nature Communications,2020,11(1).

Li，Cai Zhen.,Wang，An Qi.,Li，Chuan.,Zheng，Wen Zhuang.,Brinkman，Alexander.,...&Liao，Zhi Min.(2020).Fermi-arc supercurrent oscillations in Dirac semimetal Josephson junctions.Nature Communications,11(1).

Li，Cai Zhen,et al."Fermi-arc supercurrent oscillations in Dirac semimetal Josephson junctions".Nature Communications 11.1(2020).