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

Jauregui, Luis A.; Kayyalha, Morteza; Kazakov, Aleksandr; Miotkowski, Ireneusz; Rokhinson, Leonid P.; Chen, Yong P.

doi:10.1063/1.5008746

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

Journal Article · Tue Feb 27 00:00:00 EST 2018 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.5008746· OSTI ID:1540137

Jauregui, Luis A. ^[1];

^[1]; Kazakov, Aleksandr ^[1]; Miotkowski, Ireneusz ^[1]; Rokhinson, Leonid P. ^[1]; Chen, Yong P. ^[2]

Purdue Univ., West Lafayette, IN (United States)
Purdue Univ., West Lafayette, IN (United States); Tohoku Univ., Sendai (Japan)

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 (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.

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Research Organization:: Purdue Univ., West Lafayette, IN (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0008630

OSTI ID:: 1540137

Alternate ID(s):: OSTI ID: 1422861

Journal Information:: Applied Physics Letters, Vol. 112, Issue 9; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 19 works

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Anomalous low-temperature enhancement of supercurrent in topological-insulator nanoribbon Josephson junctions: evidence for low-energy Andreev bound states Kayyalha, Morteza; Kargarian, Mehdi; Kazakov, Aleksandr arXiv https://doi.org/10.48550/arxiv.1712.02748	text	January 2017
Perfect transmission and Aharanov-Bohm oscillations in topological insulator nanowires with nonuniform cross section Xypakis, Emmanouil; Rhim, Jun-Won; Bardarson, Jens H. arXiv https://doi.org/10.48550/arxiv.1712.06478	text	January 2017
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