Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 99: Poster Session: Transport

TT 99.12: Poster

Donnerstag, 15. März 2018, 15:00–19:00, Poster B

Clean NbSe₂-to-carbon nanotube contacts by all-dry transfer technique — •Christian Bäuml, Maria-Teresa Handschuh, Anh-Tuan Nguyen, Nicola Paradiso, and Christoph Strunk — University of Regensburg, Regensburg, Germany

The first demonstrations of devices sensitive to the presence of Majorana fermions (MFs) consisted of 1-dimensional semiconductors proximitized by a superconductor (SC) in the presence of spin-orbit interaction and of perpendicular magnetic field. Recent proposals suggested that MFs exist in carbon nanotubes (CNTs) contacted with a thin SC which retains its superconducting gap in presence of large in-plane field [1]. We demonstrate an all-dry technique for contacting CNTs with few-layer-thick flakes of NbSe₂, as SC layered material of the family of the transition metal dichalcogenides (TMDCs). The choice of NbSe₂ is motivated by its large critical in-plane magnetic field. We show that the NbSe₂-to-CNT contact resistance is comparable to that observed for other methods. Moreover, we demonstrate that, owing to the spin-valley locking in NbSe₂, few-layer devices stay superconducting up to fields of 10 Tesla, with only minor change in T_c. Our results demonstrate the first building blocks for the practical implementation of CNT-based devices for MF physics.
R. Egger et al. Phys. Rev. B 85, 235462 (2012);
M. Marganska et al. arXiv: 1711.03616