Mirage Andreev spectra generated by mesoscopic leads in nanowire quantum dots

Z. Su, A. Zarassi, J. F. Hsu, P. San-Jose, E. Prada, R. Aguado, E.J.H. Lee, S. Gazibegovic, R.L.M. Op het Veld, D. Car, S. R. Plissard, M. Hocevar, M. Pendharkar, J.S. Lee, J. A. Logan, C. J. Palmstrøm, E. P.A.M. Bakkers, S. M. Frolov

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)
31 Downloads (Pure)

Abstract

We study transport mediated by Andreev bound states formed in InSb nanowire quantum dots. Two kinds of superconducting source and drain contacts are used: epitaxial Al/InSb devices exhibit a doubling of tunneling resonances, while, in NbTiN/InSb devices, Andreev spectra of the dot appear to be replicated multiple times at increasing source-drain bias voltages. In both devices, a mirage of a crowded spectrum is created. To describe the observations a model is developed that combines the effects of a soft induced gap and of additional Andreev bound states both in the quantum dot and in the finite regions of the nanowire adjacent to the quantum dot. Understanding of Andreev spectroscopy is important for the correct interpretation of Majorana experiments done on the same structures.

Original languageEnglish
Article number127705
Number of pages5
JournalPhysical Review Letters
Volume121
Issue number12
DOIs
Publication statusPublished - 20 Sep 2018

Fingerprint

nanowires
quantum dots
electric potential
spectroscopy

Cite this

Su, Z., Zarassi, A., Hsu, J. F., San-Jose, P., Prada, E., Aguado, R., ... Frolov, S. M. (2018). Mirage Andreev spectra generated by mesoscopic leads in nanowire quantum dots. Physical Review Letters, 121(12), [127705]. https://doi.org/10.1103/PhysRevLett.121.127705
Su, Z. ; Zarassi, A. ; Hsu, J. F. ; San-Jose, P. ; Prada, E. ; Aguado, R. ; Lee, E.J.H. ; Gazibegovic, S. ; Op het Veld, R.L.M. ; Car, D. ; Plissard, S. R. ; Hocevar, M. ; Pendharkar, M. ; Lee, J.S. ; Logan, J. A. ; Palmstrøm, C. J. ; Bakkers, E. P.A.M. ; Frolov, S. M. / Mirage Andreev spectra generated by mesoscopic leads in nanowire quantum dots. In: Physical Review Letters. 2018 ; Vol. 121, No. 12.
@article{288fad364ac241399a99d8a3016f9f54,
title = "Mirage Andreev spectra generated by mesoscopic leads in nanowire quantum dots",
abstract = "We study transport mediated by Andreev bound states formed in InSb nanowire quantum dots. Two kinds of superconducting source and drain contacts are used: epitaxial Al/InSb devices exhibit a doubling of tunneling resonances, while, in NbTiN/InSb devices, Andreev spectra of the dot appear to be replicated multiple times at increasing source-drain bias voltages. In both devices, a mirage of a crowded spectrum is created. To describe the observations a model is developed that combines the effects of a soft induced gap and of additional Andreev bound states both in the quantum dot and in the finite regions of the nanowire adjacent to the quantum dot. Understanding of Andreev spectroscopy is important for the correct interpretation of Majorana experiments done on the same structures.",
author = "Z. Su and A. Zarassi and Hsu, {J. F.} and P. San-Jose and E. Prada and R. Aguado and E.J.H. Lee and S. Gazibegovic and {Op het Veld}, R.L.M. and D. Car and Plissard, {S. R.} and M. Hocevar and M. Pendharkar and J.S. Lee and Logan, {J. A.} and Palmstr{\o}m, {C. J.} and Bakkers, {E. P.A.M.} and Frolov, {S. M.}",
year = "2018",
month = "9",
day = "20",
doi = "10.1103/PhysRevLett.121.127705",
language = "English",
volume = "121",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "12",

}

Su, Z, Zarassi, A, Hsu, JF, San-Jose, P, Prada, E, Aguado, R, Lee, EJH, Gazibegovic, S, Op het Veld, RLM, Car, D, Plissard, SR, Hocevar, M, Pendharkar, M, Lee, JS, Logan, JA, Palmstrøm, CJ, Bakkers, EPAM & Frolov, SM 2018, 'Mirage Andreev spectra generated by mesoscopic leads in nanowire quantum dots', Physical Review Letters, vol. 121, no. 12, 127705. https://doi.org/10.1103/PhysRevLett.121.127705

Mirage Andreev spectra generated by mesoscopic leads in nanowire quantum dots. / Su, Z.; Zarassi, A.; Hsu, J. F.; San-Jose, P.; Prada, E.; Aguado, R.; Lee, E.J.H.; Gazibegovic, S.; Op het Veld, R.L.M.; Car, D.; Plissard, S. R.; Hocevar, M.; Pendharkar, M.; Lee, J.S.; Logan, J. A.; Palmstrøm, C. J.; Bakkers, E. P.A.M.; Frolov, S. M.

In: Physical Review Letters, Vol. 121, No. 12, 127705, 20.09.2018.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Mirage Andreev spectra generated by mesoscopic leads in nanowire quantum dots

AU - Su, Z.

AU - Zarassi, A.

AU - Hsu, J. F.

AU - San-Jose, P.

AU - Prada, E.

AU - Aguado, R.

AU - Lee, E.J.H.

AU - Gazibegovic, S.

AU - Op het Veld, R.L.M.

AU - Car, D.

AU - Plissard, S. R.

AU - Hocevar, M.

AU - Pendharkar, M.

AU - Lee, J.S.

AU - Logan, J. A.

AU - Palmstrøm, C. J.

AU - Bakkers, E. P.A.M.

AU - Frolov, S. M.

PY - 2018/9/20

Y1 - 2018/9/20

N2 - We study transport mediated by Andreev bound states formed in InSb nanowire quantum dots. Two kinds of superconducting source and drain contacts are used: epitaxial Al/InSb devices exhibit a doubling of tunneling resonances, while, in NbTiN/InSb devices, Andreev spectra of the dot appear to be replicated multiple times at increasing source-drain bias voltages. In both devices, a mirage of a crowded spectrum is created. To describe the observations a model is developed that combines the effects of a soft induced gap and of additional Andreev bound states both in the quantum dot and in the finite regions of the nanowire adjacent to the quantum dot. Understanding of Andreev spectroscopy is important for the correct interpretation of Majorana experiments done on the same structures.

AB - We study transport mediated by Andreev bound states formed in InSb nanowire quantum dots. Two kinds of superconducting source and drain contacts are used: epitaxial Al/InSb devices exhibit a doubling of tunneling resonances, while, in NbTiN/InSb devices, Andreev spectra of the dot appear to be replicated multiple times at increasing source-drain bias voltages. In both devices, a mirage of a crowded spectrum is created. To describe the observations a model is developed that combines the effects of a soft induced gap and of additional Andreev bound states both in the quantum dot and in the finite regions of the nanowire adjacent to the quantum dot. Understanding of Andreev spectroscopy is important for the correct interpretation of Majorana experiments done on the same structures.

UR - http://www.scopus.com/inward/record.url?scp=85053829239&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.121.127705

DO - 10.1103/PhysRevLett.121.127705

M3 - Article

C2 - 30296125

AN - SCOPUS:85053829239

VL - 121

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 12

M1 - 127705

ER -