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TT: Fachverband Tiefe Temperaturen

TT 53: Graphene

TT 53.10: Vortrag

Donnerstag, 30. März 2023, 17:30–17:45, HSZ 204

Non-destructive low-temperature contacts to MoS2 nanoribbon and nanotube quantum dots — •Robin T. K. Schock¹, Jonathan Neuwald¹, Konstantin D. Schneider¹, Matthias Kronseder¹, Luka Pirker², Maja Remškar², and Andreas K. Hüttel¹ — ¹Institute for Experimental and Applied Physics, University of Regensburg, 93040 Regensburg, Germany — ²Solid State Physics Department, Institute Jožef Stefan, 1000 Ljubljana, Slovenia

Planar TMDCs are at the center of manifold research efforts due to their intrinsic two dimensional nature. Despite detailed studies of their optical parameters, worldwide efforts to reach single level transport in lithographically designed quantum dots at low temperatures have so far been largely unsuccessful. This is due to the requirement for very small confinement potentials as well as disorder from dangling bonds at the edges of nanoflakes. Both issues can be circumvented by using as-grown MoS2 nanotubes and nanoribbons. First Coulomb blockade measurements were recently performed on a MoS2 nanotube[1], so far limited by disorder below the metallic scandium contacts.

Here, we present low temperature measurements on MoS₂ nanotubes and nanoribbons contacted with bismuth[2]. Our data clearly shows the non-destructive and transparent nature of these contacts to our quantum dots and indicates quantum confinement[3].
[1] S. Reinhardt et al., pssRRL 13, 1900251 (2019)
[2] P. C. Shen et al., Nature 593, 211 (2021)
[3] R. T. K. Schock et al., arXiv:2209.15515 (2022).