Dresden 2020 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 100: Electronic Structure of Surfaces II

O 100.3: Vortrag

Donnerstag, 19. März 2020, 11:00–11:15, REC C 213

Observation of anisotropic vortices on clean superconducting Nb(110) — •Felix Friedrich, Artem B. Odobesko, Robin Boshuis, Stefan Wilfert, and Matthias Bode — Physikalisches Institut, Experimentelle Physik II, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany

The quest for Majorana zero modes in solid state systems requires the possibility to distinguish between true zero energy modes and the variety of other, trivial, modes that can occur inside the superconducting gap. Large values of the gap facilitate the analysis of these in-gap states. We suggest the clean Nb(110) surface that we obtain by electron beam heating [1] as a suitable platform for future investigations of possible topological states due to its large superconducting gap ΔNb ≈ 1.53 meV. We use low-temperature STM/STS to examine the response of the Nb(110) surface to an external magnetic field. As a type-II superconductor, Nb(110) develops an Abrikosov lattice of vortices. Spectroscopy measurements at the vortex core reveal conductance peaks around zero bias, which we attribute to Caroli-de Gennes-Matricon states. Intriguingly, dI/dU maps recorded at bias voltages corresponding to energies inside the superconducting gap uncover an anisotropic shape of the vortices. We explain this observation with the pronounced nesting of the Fermi surface of Nb(110).
[1] A. B. Odobesko et al., Phys. Rev. B 99, 115437 (2019).

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