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.
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• 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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