Coulomb Blockade Spectroscopy of a $\mathrm{MoS}_2$ Nanotube

TL;DR

This study demonstrates Coulomb blockade and quantum state transitions in a multiwall MoS2 nanotube quantum dot at low temperatures, revealing discrete conductance and magnetic field effects consistent with theoretical models.

Contribution

It presents the first low-temperature transport spectroscopy of a MoS2 nanotube quantum dot, showing Coulomb blockade and magnetic field-induced quantum state transitions.

Findings

Coulomb blockade observed with 1 meV charging energy

Discrete conductance resonances at finite bias

Magnetic field reveals quantum state transitions with expected g-factors

Abstract

Low-temperature transport spectroscopy measurements on a quantum dot lithographically defined in a multiwall $\mathrm{MoS}_2$ nanotube are demonstrated. At $T=300\,\mathrm{mK}$, clear Coulomb blockade is observed, with charging energies in the range of 1 meV. In single-electron tunneling, discrete conductance resonances are visible at finite bias. Additionally, a magnetic field perpendicular to the nanotube axis reveals clear indications of quantum state transitions, with effective $g$ factors consistent with published theoretical predictions.