Berlin 2024 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 59: Transport: Poster

TT 59.2: Poster

Mittwoch, 20. März 2024, 15:00–18:00, Poster E

Quantum dots in suspended or graphite-gated MoS2 nanotubes — •Stefan B. Obloh¹, Robin T. K. Schock¹, Jonathan Neuwald¹, Matthias Kronseder¹, Matjaž Malok², Maja Remškar², and Andreas K. Hüttel¹ — ¹Institute for Experimental and Applied Physics, University ofRegensburg, 93040 Regensburg, Germany — ²Solid State Physics Department, Institute Jožef Stefan,1000 Ljubljana, Slovenia

MoS₂ as a semiconductor has attracted a lot of attention due to its 2D nature, strong spin-orbin coupling, broken inversion symmetry, and spin-split bands. By tuning the carrier density in MoS₂ with ionic liquid gating, intrinsic superconuctivity has been achieved [1]. Recent works were able to demonstrate single level transport in planar [2,3] and nanotube-based [4] devices. A remaining challenge lies in reducing the effects of substrate inhomogenity and surface charges, resulting in disordered quantum dots. To mitigate this, one can suspend the tubes above the substrate or shield them from the amorphous SiO₂. We show first measurements of nanotubes suspended between contacts as well as placed onto a hBN substrate back-gated with graphite.

[1] J. T. Ye et al., Science 338, 1193 (2012)

[2] R. Krishnan et al., Nano Lett. 23, 6171 (2023)

[3] P. Kumar et al., Nanoscale 15, 18023 (2023)

[4] R. T. K. Schock et al., Adv. Mat. 35, 13 (2023)

Keywords: MoS2; quantum dots; nanotubes; Coulomb blockade; transport spectroscopy