Imaging of sub-$\mu$A currents in bilayer graphene using a scanning
diamond magnetometer
- URL: http://arxiv.org/abs/2201.06934v1
- Date: Tue, 18 Jan 2022 12:53:46 GMT
- Title: Imaging of sub-$\mu$A currents in bilayer graphene using a scanning
diamond magnetometer
- Authors: M. L. Palm, W. S. Huxter, P. Welter, S. Ernst, P. J. Scheidegger, S.
Diesch, K. Chang, P. Rickhaus, T. Taniguchi, K. Wantanabe, K. Ensslin, and C.
L. Degen
- Abstract summary: We report on sensitive magnetic imaging of two-dimensional current distributions in bilayer graphene at room temperature.
Current density maps reveal local variations in the flow pattern and global tuning of current flow via the back-gate potential.
Our experiments demonstrate the feasibility for imaging subtle features of nanoscale transport in two-dimensional materials and conductors.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Nanoscale electronic transport gives rise to a number of intriguing physical
phenomena that are accompanied by distinct spatial patterns of current flow.
Here, we report on sensitive magnetic imaging of two-dimensional current
distributions in bilayer graphene at room temperature. By combining dynamical
modulation of the source-drain current with ac quantum sensing of a
nitrogen-vacancy center in a diamond probe, we acquire magnetic field and
current density maps with excellent sensitivities of 4.6 nT and 20 nA/$\mu$m,
respectively. The spatial resolution is 50-100 nm. We further introduce a set
of methods for increasing the technique's dynamic range and for mitigating
undesired back-action of magnetometry operation on the electronic transport.
Current density maps reveal local variations in the flow pattern and global
tuning of current flow via the back-gate potential. No signatures of
hydrodynamic transport are observed. Our experiments demonstrate the
feasibility for imaging subtle features of nanoscale transport in
two-dimensional materials and conductors.
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