Mapping current profiles of point-contacted graphene devices using single-spin scanning magnetometer

Myeongwon Lee, Seong Jang, Woochan Jung, Yuhan Lee, Takashi Taniguchi, Kenji Watanabe, Ha Reem Kim, Hong Gyu Park, Gil Ho Lee, Donghun Lee

Research output: Contribution to journalArticlepeer-review

Abstract

We demonstrate two-dimensional mapping of current flow in graphene devices by using a single-spin scanning magnetometer based on a nitrogen-vacancy defect center in diamond. We first image the stray magnetic field generated by the current and then reconstruct the current density map from the field data. We focus on the visualization of current flow around a small sized current source of ∼500 nm diameter, which works as an effective point contact. In this paper, we study two types of point-contacted graphene devices and find that the overall current profiles agree with the expected behavior of electron flow in the diffusive transport regime. This work could offer a route to explore interesting carrier dynamics of graphene including ballistic and hydrodynamic transport regimes.

Original languageEnglish
Article number033101
JournalApplied Physics Letters
Volume118
Issue number3
DOIs
Publication statusPublished - 2021 Jan 18

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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