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Regensburg 2019 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 29: Nanotubes and Nanoribbons

TT 29.4: Vortrag

Dienstag, 2. April 2019, 15:15–15:30, H2

Quantum transport through carbon nanotube NbSe2 hybrid devices for Majorana Fermion detection — •Christian Bäuml1, Michaela Eichinger1, Brecht Simon1,2, Maria-Teresa Handschuh1, Lorenz Bauriedl1, Anh-Tuan Nguyen1, Nicola Paradiso1, and Christoph Strunk11University of Regensburg, Regensburg, Germany — 2Delft University of Technology, Delft, Netherlands

The initial proposals for the realization of Majorana fermions (MFs) were based on one-dimensional semiconductors proximitized by a superconductor (SC) in the presence of spin-orbit interaction and of perpendicular magnetic field. More recently, it was suggested that MFs can also occur in carbon nanotubes (CNTs) in proximity to an ultrathin superconductor in large parallel fields [1,2].

In this work, we demonstrate first building blocks of the device proposed by Marganska et al. As a SC we chose a bilayer NbSe2 crystal, which is so thin that its electron density and chemical potential can be tuned by a gate. Such tunability is crucial to enter the topological phase of the proximitized CNT. We show that the NbSe2-CNT contact transparency can be drastically improved by exfoliating and stamping the flake in N2 atmosphere. Finally, we present a first proof-of-principle device, whose transport characteristics are measured as a function of temperature and magnetic field.
R. Egger et al. Phys. Rev. B 85, 235462 (2012)
M. Marganska et al. Phys. Rev. B 97, 075141 (2018)

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