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Reviving Nitrogen-Vacancy Centers in Diamond via Local Surface Modification.

Sergei Trofimov1, Merve Aytac1, Miriam Mendoza Delgado2

  • 1Berlin Joint EPR Laboratory and Department Spins in Energy Conversion and Quantum Information Science (ASPIN), Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, 14109 Berlin, Germany.

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Summary
This summary is machine-generated.

Researchers modified nonconductive diamond surfaces for improved quantum sensing. This surface treatment enhances the performance of nitrogen-vacancy (NV) centers, crucial for quantum sensors and qubits.

Keywords:
NV centercharge stateconductive AFMsurface oxidation

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Area of Science:

  • Materials Science
  • Quantum Physics
  • Surface Chemistry

Background:

  • Semiconductor surface termination critically impacts electronic properties and device performance.
  • For solid-state spin-based quantum sensors and qubits, surface properties are vital, especially for spins near the surface.
  • Oxygen termination is preferred for diamond-based quantum sensing using nitrogen-vacancy (NV) centers.

Purpose of the Study:

  • To develop a method for local surface modification of nonconductive diamond.
  • To investigate the impact of this modification on the performance of single nitrogen-vacancy (NV) centers.
  • To demonstrate control over the charge state and optical properties of NV centers.

Main Methods:

  • Utilized conductive atomic force microscopy (c-AFM) combined with laser illumination for local surface modification.
  • Applied the technique to nonconductive diamond surfaces.
  • Characterized the effects on single nitrogen-vacancy (NV) centers' optical properties and charge state.

Main Results:

  • Successfully modified the nonconductive diamond surface locally.
  • Achieved significant reduction in fluorescence background.
  • Demonstrated control over the charge state of single NV centers.
  • Improved optically detected magnetic resonance (ODMR) contrast from 1% to 29%.

Conclusions:

  • Local surface oxidation is proposed as the mechanism for the observed changes.
  • This method offers a pathway to enhance the performance of diamond-based quantum technologies.
  • Overcoming challenges in applying surface modifications to nonconductive materials is key for advancing quantum sensing.