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TT: Fachverband Tiefe Temperaturen

TT 66: Poster Session Transport

TT 66.11: Poster

Donnerstag, 19. März 2020, 15:00–19:00, P2/EG

Phase slip signatures in fully proximitized carbon nanotubes embedded in van der Waals stacks — •Christian Bäuml, Lorenz Bauriedl, Michaela Eichinger, Nicola Paradiso, and Christoph Strunk — University of Regensburg, Regensburg, Germany

Recently, Marganska et al. suggested that Majorana fermions (MFs) can occur in carbon nanotubes (CNTs) proximitized by superconductor (SC) in large fields perpendicular to the CNT axis [1].

In this work, we demonstrate the first building blocks of the proposed device. As a SC we chose a bilayer NbSe₂ crystal, an Ising SC capable to sustain large in-plane magnetic fields. A 7 µm-wide bilayer flake is stamped on top of a 9 µm-long CNT, laterally contacted via Au edge-contacts [2,3]. NbSe₂ and edge Au contacts turn out to be extremely transparent. Consequently, we observe a large supercurrent induced even in the 2 µm-long portion of CNT not directly proximitized by NbSe₂, with a 2-terminal conductance exceeding 120 e²/h. Moreover, the conductance through the CNT shows sharp magnetic field-dependent dips, which we attribute to phase slippage events within the 1D superconducting system, a 1D analogue of what observed recently in 2D systems as NbSe₂ [4].

[1] M. Marganska et al., Phys. Rev. B 97, 075141 (2018)

[2] L. Wang et al., Science 614, 342 (2013)

[3] J.-W. Huang et al., Nano letters 15, 10 (2015)

[4] N. Paradiso et al., 2D Mater. 6, 025039 (2019)