Electric field tunable superconductor-semiconductor coupling in Majorana nanowires

Michiel W.A. De Moor; Jouri D.S. Bommer; Di Xu; Georg W. Winkler; Andrey E. Antipov; Arno Bargerbos; Guanzhong Wang; Nick Van Loo; Roy L.M. Op Het Veld; Sasa Gazibegovic; Diana Car; Erik P.A. M Bakkers; Leo P. Kouwenhoven; Hao Zhang

doi:10.1088/1367-2630/aae61d

Electric field tunable superconductor-semiconductor coupling in Majorana nanowires

Michiel W.A. De Moor, Jouri D.S. Bommer, Di Xu, Georg W. Winkler, Andrey E. Antipov, Arno Bargerbos, Guanzhong Wang, Nick Van Loo, Roy L.M. Op Het Veld, Sasa Gazibegovic, Diana Car, Erik P.A. M Bakkers, Leo P. Kouwenhoven, Hao Zhang^*

^*Corresponding author for this work

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Abstract

We study the effect of external electric fields on superconductor-semiconductor coupling by measuring the electron transport in InSb semiconductor nanowires coupled to an epitaxially grown Al superconductor. We find that the gate voltage induced electric fields can greatly modify the coupling strength, which has consequences for the proximity induced superconducting gap, effective g-factor, and spin-orbit coupling, which all play a key role in understanding Majorana physics. We further show that level repulsion due to spin-orbit coupling in a finite size system can lead to seemingly stable zero bias conductance peaks, which mimic the behavior of Majorana zero modes. Our results improve the understanding of realistic Majorana nanowire systems.

Original language	English
Article number	103049
Number of pages	25
Journal	New Journal of Physics
Volume	20
Issue number	10
DOIs	https://doi.org/10.1088/1367-2630/aae61d
Publication status	Published - 2018

Keywords

Majorana fermions
nanowires
spin-orbit coupling
superconductivity

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10.1088/1367-2630/aae61d

de_Moor_2018_New_J._Phys._20_103049Final published version, 2.86 MBLicence: CC BY

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De Moor, M. W. A., Bommer, J. D. S., Xu, D., Winkler, G. W., Antipov, A. E., Bargerbos, A., Wang, G., Loo, N. V., Op Het Veld, R. L. M., Gazibegovic, S., Car, D., M Bakkers, E. P. A., Kouwenhoven, L. P., & Zhang, H. (2018). Electric field tunable superconductor-semiconductor coupling in Majorana nanowires. New Journal of Physics, 20(10), Article 103049. https://doi.org/10.1088/1367-2630/aae61d

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title = "Electric field tunable superconductor-semiconductor coupling in Majorana nanowires",

abstract = "We study the effect of external electric fields on superconductor-semiconductor coupling by measuring the electron transport in InSb semiconductor nanowires coupled to an epitaxially grown Al superconductor. We find that the gate voltage induced electric fields can greatly modify the coupling strength, which has consequences for the proximity induced superconducting gap, effective g-factor, and spin-orbit coupling, which all play a key role in understanding Majorana physics. We further show that level repulsion due to spin-orbit coupling in a finite size system can lead to seemingly stable zero bias conductance peaks, which mimic the behavior of Majorana zero modes. Our results improve the understanding of realistic Majorana nanowire systems.",

keywords = "Majorana fermions, nanowires, spin-orbit coupling, superconductivity",

author = "{De Moor}, {Michiel W.A.} and Bommer, {Jouri D.S.} and Di Xu and Winkler, {Georg W.} and Antipov, {Andrey E.} and Arno Bargerbos and Guanzhong Wang and Loo, {Nick Van} and {Op Het Veld}, {Roy L.M.} and Sasa Gazibegovic and Diana Car and {M Bakkers}, {Erik P.A.} and Kouwenhoven, {Leo P.} and Hao Zhang",

year = "2018",

doi = "10.1088/1367-2630/aae61d",

language = "English",

volume = "20",

journal = "New Journal of Physics",

issn = "1367-2630",

publisher = "IOP Publishing",

number = "10",

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TY - JOUR

T1 - Electric field tunable superconductor-semiconductor coupling in Majorana nanowires

AU - De Moor, Michiel W.A.

AU - Bommer, Jouri D.S.

AU - Xu, Di

AU - Winkler, Georg W.

AU - Antipov, Andrey E.

AU - Bargerbos, Arno

AU - Wang, Guanzhong

AU - Loo, Nick Van

AU - Op Het Veld, Roy L.M.

AU - Gazibegovic, Sasa

AU - Car, Diana

AU - M Bakkers, Erik P.A.

AU - Kouwenhoven, Leo P.

AU - Zhang, Hao

PY - 2018

Y1 - 2018

N2 - We study the effect of external electric fields on superconductor-semiconductor coupling by measuring the electron transport in InSb semiconductor nanowires coupled to an epitaxially grown Al superconductor. We find that the gate voltage induced electric fields can greatly modify the coupling strength, which has consequences for the proximity induced superconducting gap, effective g-factor, and spin-orbit coupling, which all play a key role in understanding Majorana physics. We further show that level repulsion due to spin-orbit coupling in a finite size system can lead to seemingly stable zero bias conductance peaks, which mimic the behavior of Majorana zero modes. Our results improve the understanding of realistic Majorana nanowire systems.

AB - We study the effect of external electric fields on superconductor-semiconductor coupling by measuring the electron transport in InSb semiconductor nanowires coupled to an epitaxially grown Al superconductor. We find that the gate voltage induced electric fields can greatly modify the coupling strength, which has consequences for the proximity induced superconducting gap, effective g-factor, and spin-orbit coupling, which all play a key role in understanding Majorana physics. We further show that level repulsion due to spin-orbit coupling in a finite size system can lead to seemingly stable zero bias conductance peaks, which mimic the behavior of Majorana zero modes. Our results improve the understanding of realistic Majorana nanowire systems.

KW - Majorana fermions

KW - nanowires

KW - spin-orbit coupling

KW - superconductivity

UR - http://www.scopus.com/inward/record.url?scp=85055960213&partnerID=8YFLogxK

U2 - 10.1088/1367-2630/aae61d

DO - 10.1088/1367-2630/aae61d

M3 - Article

AN - SCOPUS:85055960213

SN - 1367-2630

VL - 20

JO - New Journal of Physics

JF - New Journal of Physics

IS - 10

M1 - 103049

ER -

Electric field tunable superconductor-semiconductor coupling in Majorana nanowires

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