Signatures of induced superconductivity in a p-n heterostructure comprised of Sb2Te3 and Bi2Te3 3D topological insulator thin films with in situ Al capping

  • Peter Schüffelgen (Speaker)
  • Daniel Rosenbach (Contributor)
  • Martin Lanius (Contributor)
  • Jörn Kampmeier (Contributor)
  • Gregor Mussler (Contributor)
  • Markus Eschbach (Contributor)
  • Ewa Mlynczak (Contributor)
  • L.ukasz Plucinski (Contributor)
  • Martina Luysberg (Contributor)
  • Stefan Trellenkamp (Speaker)
  • Martin Stehno (Contributor)
  • Prosper Ngabonziza (Contributor)
  • Brinkman, A. (Contributor)
  • Yuan Pang (Contributor)
  • Li Lu (Contributor)
  • Thomas Schäpers (Contributor)
  • Detlev Grützmacher (Contributor)

Activity: Talk or presentationOral presentation

Description

We investigate the transport properties of Sb2Te3/Bi2Te3 p-n heterostructure topological insulator film-superconductor junctions. The films are grown by means of molecular beam epitaxy on a Si (111) substrate and capped in-situ by a thin layer of aluminum to prevent thin film degradation and to preserve the Dirac-like surface states. Josephson junctions are defined by depositing two niobium electrodes, separated by a few tens of nanometers, onto the Sb2Te3/Bi2Te3 layer. The transport measurements at cryogenic temperatures showed signatures of Andreev reflections and Josephson supercurrents. For wider junctions a Fraunhofer pattern was observed for the critical current, whereas for the narrow junctions a monotonous decrease was found.
Period11 Mar 2016
Event titleDPG Frühjahrstagung 2016 Regensburg: (DPG Spring Meeting)
Event typeConference
OrganiserDeutsche Physikalische Gesellschaft
LocationRegensburg, Germany
Degree of RecognitionInternational