Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 2: Nanotubes, Nanoribbons and Graphene

TT 2.2: Vortrag

Montag, 5. September 2022, 09:45–10:00, H22

Transparent low-temperature contacts to MoS₂ microtubes — •Robin T. K. Schock¹, Jonathan Neuwald¹, Matthias Kronseder¹, Simon Reinhardt¹, 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

Even though synthesis procedures of transition metal dichalcogenide (TMDC) based nanotubes have been established for many years, the quantum transport properties remain largely unexplored to date. First low-temperature transort spectroscopy results clearly show Coulomb blockage at 300 mK [1]. However, the contact material still remains a limiting factor due to the Fermi level pinning near the conduction band. Recently, for planar MoS2 materials [2], the use of bismuth improved room-temperature contact resistances drastically. Here we present first transport measurements on MoS2 microtubes with bismuth contacts at millikelvin temperatures. Our MoS2 tubes are grown via a chemical transport reaction, yielding diameters down to 7 nm and lengths up to several millimeters. After transfering the tubes onto a Si/SiO₂ substrate, contacts are deposited using electron beam lithography. The resulting devices show Coulomb blockade, with in many cases, a transition from transparent conduction into a band gap. Disorder, compared with previous scandium-based devices, is significantly reduced.

[1] S. Reinhardt et al., Phys. Stat. Sol. RRL 13, 1900251 (2019)

[2] P. C. Shen et al., Nature 593, 211 (2021).