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Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 14: Poster: Two-Dimenaional Materials and Topological Insulators

HL 14.11: Poster

Montag, 20. März 2017, 14:00–18:00, P2-OG3

Possible topological insulator / superconductor interfaces for the investigation of Majorana excitations: (Bi1−xSbx)2Te3 and FeSe — •Philipp Küppers1, Jens Kellner1, Markus Eschbach2, Martin Lanius3, Marcus Liebmann1, Lukasz Plucinski2, and Markus Morgenstern11II. Physikalisches Institut B RWTH Aachen University — 2PGI 6 Forschungszentrum Jülich — 3PGI 9 Forschungszentrum Jülich

Proximity induced s-type superconductivity (SC) in a topological insulator (TI) can lead to spinless, p-type superconductivity, which is the main ingredient for the creation of Majorana excitations (ME). To prove the existence of such quasi particles within the vortex of a type II SC grown on top of a TI with STS, two requirements have to be fulfilled. The Fermi energy EF of the system has to be close to the Dirac point energy ED of the TI and the superconducting gap has to be large in order to differentiate the ME from conventionally excited states within the vortex.

We present a method of tuning ED with respect to EF within 10 meV in the ternary TI (Bi1−xSbx)2Te3 by variation of the Sb concentration x [1]. We show first ARPES measurements of the band structure of the SC FeSe grown on SrTiO3. Methods of inducing high temperature SC in FeSe are also presented.

[1] Jens Kellner et al., Appl. Phys. Lett. 107, 251603 (2015)

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