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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.

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Presenters

  • Uri Vool

    Harvard University

Authors

  • Uri Vool

    Harvard University

  • Assaf Hamo

    Harvard University

  • Xu Zhou

    Harvard University

  • Johannes Gooth

    MPI for chemical physics of solids, Dresden, Max Planck Institute for Chemical Physics of Solid, Max Planck Institute for Chemical Physics of Solids, Dresden, Germany, Chemical Physics of Solids, Max Planck Institute

  • Claudia Felser

    Max Planck Institute for Chemical Physics of Solids, MPI-CPfS Dresden, Max Planck Institute For Chemical and Physical Solids, MPI for chemical physics of solids, Dresden, Solid State Chemistry, Max Planck Institute Chemical Physics of Solids, Max Planck Institute, Max-Planck-Institute for Chemical Physics of Solids , Nöthnitzer Straße-40, 01187 Dresden, Germany, Max Planck Inst, Max Planck Dresden, Chemical Physics of Solids, Max Planck Institute

  • Amir Yacoby

    Harvard University, Department of Physics, Harvard University, Physics, Harvard University, Department of Physics, Harvard University, Cambridge, MA, 02138, USA