Origin of bias-independent conductance plateaus and zero-bias conductance peaks in Bi2Se3/NbSe2 hybrid structures

Li, Hui1; Zhou, Tong1; He, Jun1; Wang, Huan-Wen1; Zhang, Huachen1; Liu, Hong-Chao1; Yi, Ya1; Wu, Changming1; Law, Kam Tuen1; He, Hongtao2; Wang, Jiannong1

2017-08-07

10.1103/PhysRevB.96.075107

PHYSICAL REVIEW B   影响因子和分区

2469-9950

2469-9969

Superconducting proximity effect in topological insulator and superconductor hybrid structure has attracted intense attention in recent years in an effort to search for Majorana fermions in condensed matter systems. Here we report on the superconducting proximity effect in a Bi2Se3/NbSe2 junction fabricated with an all-dry transfer method. Experimentally measured differential conductance spectra exhibit a bias-independent conductance plateau (BICP) in the vicinity of zero bias below 7 K and a zero-bias conductance peak (ZBCP) appears below 2 K. We show that the BICP is due to the strong superconducting proximity effect between the superconductor and the topological surface states while the ZBCP is due to the bulk states of Bi2Se3. Our study gives direct evidence that the topological surface states can be strongly coupled to a superconductor and clarifies the different roles of surface states and bulk states in superconducting proximity effect.

SCI ; EI

英语

其他

Special Funds for the Development of Strategic Emerging Industries of Shenzhen in China[JCYJ20140714151402765]

Materials Science ; Physics

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

WOS:000407015600002

AMER PHYSICAL SOC

20191906873352

Surface states ; Topological insulators ; Topology

Superconducting Materials:708.3 ; Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4 ; Classical Physics; Quantum Theory; Relativity:931 ; High Energy Physics; Nuclear Physics; Plasma Physics:932

PHYSICS

Web of Science

1.Hong Kong Univ Sci & Technol, Dept Phys, Clear Water Bay, Hong Kong, Peoples R China
2.South Univ Sci & Technol China, Dept Phys, Shenzhen 518055, Guangdong, Peoples R China

Li, Hui,Zhou, Tong,He, Jun,et al. Origin of bias-independent conductance plateaus and zero-bias conductance peaks in Bi2Se3/NbSe2 hybrid structures[J]. PHYSICAL REVIEW B,2017,96(7).

Li, Hui.,Zhou, Tong.,He, Jun.,Wang, Huan-Wen.,Zhang, Huachen.,...&Wang, Jiannong.(2017).Origin of bias-independent conductance plateaus and zero-bias conductance peaks in Bi2Se3/NbSe2 hybrid structures.PHYSICAL REVIEW B,96(7).

Li, Hui,et al."Origin of bias-independent conductance plateaus and zero-bias conductance peaks in Bi2Se3/NbSe2 hybrid structures".PHYSICAL REVIEW B 96.7(2017).