Imaging current in semimetals with cryogenic scanning NV magnetometry
ORAL
Abstract
Among their many unique features, Weyl semimetals are predicted to enable complex electron-electron and electron-phonon interactions. Such behavior has been predicted, and recently measured, to induce correlated flow of electrons through the semimetal.
We study the current profile in a tungsten ditelluride flake by imaging the local magnetic field above it using a nitrogen-vacancy (NV) center in a diamond scanning tip. Using coherent quantum sensing, we obtain magnetic field resolution of ~10nT and spatial resolution of ~100nm.
The current pattern we observe differs substantially from that of a normal metal, suggesting correlated flow through the semimetal.
We study the current profile in a tungsten ditelluride flake by imaging the local magnetic field above it using a nitrogen-vacancy (NV) center in a diamond scanning tip. Using coherent quantum sensing, we obtain magnetic field resolution of ~10nT and spatial resolution of ~100nm.
The current pattern we observe differs substantially from that of a normal metal, suggesting correlated flow through the semimetal.
*This work was supported by the Army Research office (Grant W911NF-17-1-0023) and by the JHDSF program at Harvard University. Devices were fabricated at the Center for Nanoscale Systems (DMR-1541959).
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Presenters
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Uri Vool
- Harvard University