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Josephson supercurrent through a topological insulator surface state

Journal Article


Abstract


  • The long-sought yet elusive Majorana fermion1 is predicted to

    arise from a combination of a superconductor and a topological

    insulator2–4. An essential step in the hunt for this emergent

    particle is the unequivocal observation of supercurrent in

    a topological phase. Here, direct evidence for Josephson

    supercurrents in superconductor (Nb)–topological insulator

    (Bi2Te3)–superconductor electron-beam fabricated junctions

    is provided by the observation of clear Shapiro steps under

    microwave irradiation, and a Fraunhofer-type dependence of

    the critical current on magnetic field. Shubnikov–de Haas

    oscillations in magnetic fields up to 30 T reveal a topologically

    non-trivial two-dimensional surface state. This surface state

    is attributed to mediate the ballistic Josephson current

    despite the fact that the normal state transport is dominated

    by diffusive bulk conductivity. The lateral Nb–Bi2Te3–Nb

    junctions hence provide prospects for the realization of devices

    supporting Majorana fermions5.

UOW Authors


  •   Veldhorst, Menno (external author)
  •   Snelder, M (external author)
  •   Hoek, M (external author)
  •   Gang, T (external author)
  •   Guduru, V (external author)
  •   Wang, Xiaolin
  •   Zeitler, U (external author)
  •   Van Der Wiel, W (external author)
  •   Golubov, Alexander (external author)
  •   Hilgenkamp, Hans (external author)
  •   Brinkham, A (external author)

Publication Date


  • 2012

Citation


  • Veldhorst, M., Snelder, M., Hoek, M., Gang, T., Guduru, V., Wang, X., Zeitler, U., Van Der Wiel, W., Golubov, A., Hilgenkamp, H. & Brinkham, A. (2012). Josephson supercurrent through a topological insulator surface state. Nature Materials, 11 (5), 417-421.

Scopus Eid


  • 2-s2.0-84862777705

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/539

Has Global Citation Frequency


Number Of Pages


  • 4

Start Page


  • 417

End Page


  • 421

Volume


  • 11

Issue


  • 5

Place Of Publication


  • United Kingdom

Abstract


  • The long-sought yet elusive Majorana fermion1 is predicted to

    arise from a combination of a superconductor and a topological

    insulator2–4. An essential step in the hunt for this emergent

    particle is the unequivocal observation of supercurrent in

    a topological phase. Here, direct evidence for Josephson

    supercurrents in superconductor (Nb)–topological insulator

    (Bi2Te3)–superconductor electron-beam fabricated junctions

    is provided by the observation of clear Shapiro steps under

    microwave irradiation, and a Fraunhofer-type dependence of

    the critical current on magnetic field. Shubnikov–de Haas

    oscillations in magnetic fields up to 30 T reveal a topologically

    non-trivial two-dimensional surface state. This surface state

    is attributed to mediate the ballistic Josephson current

    despite the fact that the normal state transport is dominated

    by diffusive bulk conductivity. The lateral Nb–Bi2Te3–Nb

    junctions hence provide prospects for the realization of devices

    supporting Majorana fermions5.

UOW Authors


  •   Veldhorst, Menno (external author)
  •   Snelder, M (external author)
  •   Hoek, M (external author)
  •   Gang, T (external author)
  •   Guduru, V (external author)
  •   Wang, Xiaolin
  •   Zeitler, U (external author)
  •   Van Der Wiel, W (external author)
  •   Golubov, Alexander (external author)
  •   Hilgenkamp, Hans (external author)
  •   Brinkham, A (external author)

Publication Date


  • 2012

Citation


  • Veldhorst, M., Snelder, M., Hoek, M., Gang, T., Guduru, V., Wang, X., Zeitler, U., Van Der Wiel, W., Golubov, A., Hilgenkamp, H. & Brinkham, A. (2012). Josephson supercurrent through a topological insulator surface state. Nature Materials, 11 (5), 417-421.

Scopus Eid


  • 2-s2.0-84862777705

Ro Metadata Url


  • http://ro.uow.edu.au/aiimpapers/539

Has Global Citation Frequency


Number Of Pages


  • 4

Start Page


  • 417

End Page


  • 421

Volume


  • 11

Issue


  • 5

Place Of Publication


  • United Kingdom