Conductance spectroscopy of vertical topological Josephson junction Nb/(Bi0.5Sb0.5)2Te3/Nb

被引：0
|
作者：
Li, Lin [1 ,2 ]
Ma, Xiao-Dong [3 ,4 ]
Dai, Yutong [1 ,2 ]
Zhang, Hui [3 ,4 ]
Nichols, George [1 ,2 ]
Cheng, Long [1 ,2 ]
Langenberg, Deler [1 ,2 ]
Miao, Guo-Xing [1 ,2 ]
机构：
[1] Univ Waterloo, Inst Quantum Comp, 200 Univ Ave, Waterloo, ON N2L 3G1, Canada
[2] Univ Waterloo, Dept Elect & Comp Engn, 200 Univ Ave, Waterloo, ON N2L 3G1, Canada
[3] Univ Sci & Technol China, Hefei Natl Lab Phys Sci Microscale, Hefei 230026, Anhui, Peoples R China
[4] Univ Sci & Technol China, Dept Phys, Hefei 230026, Anhui, Peoples R China
来源：
SPINTRONICS XI | 2018年 / 10732卷
基金：
加拿大自然科学与工程研究理事会;
关键词：
topological insulator; superconductivity; proximity effect; Josephson effect; p-wave paring; zero bias conductance peak;
D O I：
10.1117/12.2323561
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
The surface states of a topological insulator (TI) can be induced with superconductivity through proximity with a conventional s-wave superconductor (S). To study the coupling between two superconducting TI surfaces, we report the growth and fabrication of vertical Josephson junctions with the topological insulators (Bi0.5Sb0.5)(2)Te-3 sandwiched between Nb electrodes. We observed two Josephson critical currents on the I-V characteristic at 3.5 K, attributed to the bulk Nb and the proximity-induced superconducting (Bi0.5Sb0.5)(2)Te-3 surfaces, respectively. The enhancement of conductance at these two critical currents leads to a bump and a plateau on the differential conductance spectroscopy. By further cooling down to 300 mK, a zero bias conductance peak (ZBCP) appears on the plateau, which is taken as a feature from the unconventional paring at the (Bi0.5Sb0.5)(2)Te-3-Nb interface.
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页数：7
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