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Title: Gate-tunable supercurrent and multiple Andreev reflections in a superconductor-topological insulator nanoribbon-superconductor hybrid device

Abstract

We report on the observation of gate-tunable proximity-induced superconductivity and multiple Andreev reflections (MARs) in a bulk-insulating BiSbTeSe 2 topological insulator nanoribbon (TINR) Josephson junction with superconducting Nb contacts. We observe a gate-tunable critical current (I C) for gate voltages (V g) above the charge neutrality point (V CNP), with I C as large as 430 nA. We also observe MAR peaks in the differential conductance (dI/dV) versus DC voltage (V dc) across the junction corresponding to sub-harmonic peaks (at V dc = V n = 2Δ Nb/en, where ΔNb is the superconducting gap of the Nb contacts and n is the sub-harmonic order). The sub-harmonic order, n, exhibits a V g-dependence and reaches n = 13 for V g = 40 V, indicating the high transparency of the Nb contacts to TINR. Our observations pave the way toward exploring the possibilities of using TINR in topologically protected devices that may host exotic physics such as Majorana fermions.

Authors:
 [1]; ORCiD logo [1];  [1];  [1];  [1];  [2]
  1. Purdue Univ., West Lafayette, IN (United States)
  2. Purdue Univ., West Lafayette, IN (United States); Tohoku Univ., Sendai (Japan)
Publication Date:
Research Org.:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1540137
Alternate Identifier(s):
OSTI ID: 1422861
Grant/Contract Number:  
SC0008630
Resource Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 112; Journal Issue: 9; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Physics

Citation Formats

Jauregui, Luis A., Kayyalha, Morteza, Kazakov, Aleksandr, Miotkowski, Ireneusz, Rokhinson, Leonid P., and Chen, Yong P. Gate-tunable supercurrent and multiple Andreev reflections in a superconductor-topological insulator nanoribbon-superconductor hybrid device. United States: N. p., 2018. Web. doi:10.1063/1.5008746.
Jauregui, Luis A., Kayyalha, Morteza, Kazakov, Aleksandr, Miotkowski, Ireneusz, Rokhinson, Leonid P., & Chen, Yong P. Gate-tunable supercurrent and multiple Andreev reflections in a superconductor-topological insulator nanoribbon-superconductor hybrid device. United States. doi:10.1063/1.5008746.
Jauregui, Luis A., Kayyalha, Morteza, Kazakov, Aleksandr, Miotkowski, Ireneusz, Rokhinson, Leonid P., and Chen, Yong P. Tue . "Gate-tunable supercurrent and multiple Andreev reflections in a superconductor-topological insulator nanoribbon-superconductor hybrid device". United States. doi:10.1063/1.5008746. https://www.osti.gov/servlets/purl/1540137.
@article{osti_1540137,
title = {Gate-tunable supercurrent and multiple Andreev reflections in a superconductor-topological insulator nanoribbon-superconductor hybrid device},
author = {Jauregui, Luis A. and Kayyalha, Morteza and Kazakov, Aleksandr and Miotkowski, Ireneusz and Rokhinson, Leonid P. and Chen, Yong P.},
abstractNote = {We report on the observation of gate-tunable proximity-induced superconductivity and multiple Andreev reflections (MARs) in a bulk-insulating BiSbTeSe2 topological insulator nanoribbon (TINR) Josephson junction with superconducting Nb contacts. We observe a gate-tunable critical current (IC) for gate voltages (Vg) above the charge neutrality point (VCNP), with IC as large as 430 nA. We also observe MAR peaks in the differential conductance (dI/dV) versus DC voltage (Vdc) across the junction corresponding to sub-harmonic peaks (at Vdc = Vn = 2ΔNb/en, where ΔNb is the superconducting gap of the Nb contacts and n is the sub-harmonic order). The sub-harmonic order, n, exhibits a Vg-dependence and reaches n = 13 for Vg = 40 V, indicating the high transparency of the Nb contacts to TINR. Our observations pave the way toward exploring the possibilities of using TINR in topologically protected devices that may host exotic physics such as Majorana fermions.},
doi = {10.1063/1.5008746},
journal = {Applied Physics Letters},
number = 9,
volume = 112,
place = {United States},
year = {2018},
month = {2}
}

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