Bulk and surface states carried supercurrent in ballistic Nb-Dirac semimetal Cd3As2 nanowire-Nb junctions

Li, Cai-Zhen1; Li, Chuan2; Wang, Li-Xian1; Wang, Shuo1; Liao, Zhi-Min1,3; Brinkman, Alexander2; Yu, Da-Peng1,4,5

2018-03-27

10.1103/PhysRevB.97.115446

PHYSICAL REVIEW B   影响因子和分区

2469-9950

2469-9969

A three-dimensional Dirac semimetal has bulk Dirac cones in all three momentum directions and Fermi arc like surface states, and can be converted into a Weyl semimetal by breaking time-reversal symmetry. However, the highly conductive bulk state usually hides the electronic transport from the surface state in Dirac semimetal. Here, we demonstrate the supercurrent carried by bulk and surface states in Nb-Cd3As2 nanowire-Nb short and long junctions, respectively. For the similar to 1-mu m-long junction, the Fabry-Perot interferences-induced oscillations of the critical supercurrent are observed, suggesting the ballistic transport of the surface states carried supercurrent, where the bulk states are decoherent and the topologically protected surface states still stay coherent. Moreover, a superconducting dome is observed in the long junction, which is attributed to the enhanced dephasing from the interaction between surface and bulk states as tuning gate voltage to increase the carrier density. The superconductivity of topological semimetal nanowire is promising for braiding of Majorana fermions toward topological quantum computing.

SCI ; EI

英语

其他

NSFC[11774004]

Materials Science ; Physics

Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter

WOS:000428387700007

AMER PHYSICAL SOC

20191906874644

Arsenic compounds ; Ballistics ; Cadmium compounds ; Nanowires ; Quantum computers ; Surface states ; Topology

Computer Systems and Equipment:722 ; Nanotechnology:761 ; Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4 ; Classical Physics; Quantum Theory; Relativity:931 ; Mechanics:931.1 ; High Energy Physics; Nuclear Physics; Plasma Physics:932 ; Solid State Physics:933

PHYSICS

Web of Science

1.Peking Univ, Sch Phys, State Key Lab Mesoscop Phys, Beijing 100871, Peoples R China
2.Univ Twente, MESA Inst Nanotechnol, NL-7500 AE Enschede, Netherlands
3.Collaborat Innovat Ctr Quantum Matter, Beijing 100871, Peoples R China
4.South Univ Sci & Technol China, Inst Quantum Sci & Engn, Shenzhen 518055, Peoples R China
5.South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Peoples R China

Li, Cai-Zhen,Li, Chuan,Wang, Li-Xian,et al. Bulk and surface states carried supercurrent in ballistic Nb-Dirac semimetal Cd3As2 nanowire-Nb junctions[J]. PHYSICAL REVIEW B,2018,97(11).

Li, Cai-Zhen.,Li, Chuan.,Wang, Li-Xian.,Wang, Shuo.,Liao, Zhi-Min.,...&Yu, Da-Peng.(2018).Bulk and surface states carried supercurrent in ballistic Nb-Dirac semimetal Cd3As2 nanowire-Nb junctions.PHYSICAL REVIEW B,97(11).

Li, Cai-Zhen,et al."Bulk and surface states carried supercurrent in ballistic Nb-Dirac semimetal Cd3As2 nanowire-Nb junctions".PHYSICAL REVIEW B 97.11(2018).