Journal
NANO LETTERS
Volume 17, Issue 4, Pages 2367-2373Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b05304
Keywords
Magnetic imaging; scanning probe microscopy; quantum sensing; single spin; diamond nitrogen-vacancy center; electron paramagnetic resonance
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Funding
- European Commission [611143]
- Swiss NSF through the NCCR QSIT
- Swiss NSF [200021_137520]
- Swiss National Science Foundation (SNF) [200021_137520] Funding Source: Swiss National Science Foundation (SNF)
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Charge transport in nanostructures and thin films is fundamental to many phenomena and processes in science and technology, ranging from quantum effects and electronic correlations in mesoscopic physics, to integrated charge- or spin based electronic circuits, to photoactive layers in energy research. Direct visualization of the charge flow in such structures is challenging due to their nanometer size and the itinerant nature of currents. In this work, we demonstrate noninvasive magnetic imaging of current density in two-dimensional conductor networks including metallic nanowires and carbon nanotubes. Our sensor is the electronic spin of a diamond nitrogen-vacancy center attached to a scanning tip and operated under ambient conditions. Using a differential measurement technique, we detect DC currents down to a few mu A with a current density noise floor of similar to 2 x 10(4) A/cm(2). Reconstructed images have a spatial resolution of typically 50 nm, with a best-effort value of 22 nm. Current density imaging offers a new route for studying electronic transport and conductance variations in two-dimensional materials and devices, with many exciting applications in condensed matter physics and materials science.
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