Library
local_library Home Repository

A Mechanically Tunable Quantum Dot in a Graphene Break Junction

Journal Article (2020)
Author(s)

S. Caneva (TU Delft - BN/Cees Dekker Lab, Kavli institute of nanoscience Delft, TU Delft - QN/van der Zant Lab, TU Delft - Dynamics of Micro and Nano Systems)

Matthijs Hermans (Kavli institute of nanoscience Delft, Student TU Delft)

M. Lee (TU Delft - QN/Steeneken Lab, Kavli institute of nanoscience Delft)

Amador García-Fuente (Universidad de Oviedo)

Kenji Watanabe (National Institute for Materials Science)

Takashi Taniguchi (National Institute for Materials Science)

C. Dekker (TU Delft - BN/Cees Dekker Lab, Kavli institute of nanoscience Delft)

Jaime Ferrer (Universidad de Oviedo)

H.S.J. van der Zant (Kavli institute of nanoscience Delft, TU Delft - QN/van der Zant Lab)

P. Gehring (TU Delft - QN/van der Zant Lab, Kavli institute of nanoscience Delft)

BN/Cees Dekker Lab
Copyright
© 2020 S. Caneva, Matthijs Hermans, M. Lee, Amador García-Fuente, Kenji Watanabe, Takashi Taniguchi, C. Dekker, Jaime Ferrer, H.S.J. van der Zant, P. Gehring
DOI related publication
https://doi.org/10.1021/acs.nanolett.0c00984
More Info
expand_more
Publication Year
2020
Language
English
Copyright
© 2020 S. Caneva, Matthijs Hermans, M. Lee, Amador García-Fuente, Kenji Watanabe, Takashi Taniguchi, C. Dekker, Jaime Ferrer, H.S.J. van der Zant, P. Gehring
BN/Cees Dekker Lab
Issue number
7
Volume number
20
Pages (from-to)
4924-4931
Reuse Rights

Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.

Abstract

Graphene quantum dots (QDs) are intensively studied as platforms for the next generation of quantum electronic devices. Fine tuning of the transport properties in monolayer graphene QDs, in particular with respect to the independent modulation of the tunnel barrier transparencies, remains challenging and is typically addressed using electrostatic gating. We investigate charge transport in back-gated graphene mechanical break junctions and reveal Coulomb blockade physics characteristic of a single, high-quality QD when a nanogap is opened in a graphene constriction. By mechanically controlling the distance across the newly formed graphene nanogap, we achieve reversible tunability of the tunnel coupling to the drain electrode by 5 orders of magnitude, while keeping the source-QD tunnel coupling constant. The break junction device can therefore become a powerful platform to study the physical parameters that are crucial to the development of future graphene-based devices, including energy converters and quantum calorimeters.