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

Lin Li; Xiao-Dong Ma; Yutong Dai; Hui Zhang; George Nichols; Long Cheng; Deler Langenberg; Guo-Xing Miao

doi:10.1117/12.2323561

20 September 2018 Conductance spectroscopy of vertical topological Josephson junction Nb/(Bi_0.5Sb_0.5)₂Te₃/Nb

Lin Li, Xiao-Dong Ma, Yutong Dai, Hui Zhang, George Nichols, Long Cheng, Deler Langenberg, Guo-Xing Miao

Proceedings Volume 10732, Spintronics XI; 107321S (2018) https://doi.org/10.1117/12.2323561
Event: SPIE Nanoscience + Engineering, 2018, San Diego, California, United States

Abstract

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 (Bi_0.5Sb_0.5)₂Te₃ 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 (Bi_0.5Sb_0.5)₂Te₃ 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 (Bi_0.5Sb_0.5)₂Te₃-Nb interface.

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Lin Li, Xiao-Dong Ma, Yutong Dai, Hui Zhang, George Nichols, Long Cheng, Deler Langenberg, and Guo-Xing Miao "Conductance spectroscopy of vertical topological Josephson junction Nb/(Bi_0.5Sb_0.5)₂Te₃/Nb", Proc. SPIE 10732, Spintronics XI, 107321S (20 September 2018); https://doi.org/10.1117/12.2323561

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