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Charge-State Control of Modified Divacancies in Silicon Carbide.

Wu-Xi Lin1,2,3, Qi-Cheng Hu1,2,3,4, Zhi-He Hao1,2,3

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Researchers achieved controlled charge states in silicon carbide divacancies using lasers. This breakthrough is vital for developing quantum information technologies like spin qubits and single-photon sources.

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Area of Science:

  • Quantum computing and photonics
  • Materials science and solid-state physics

Background:

  • Modified divacancies in silicon carbide are promising for quantum applications.
  • Controlling their charge states is essential for quantum information processing.

Purpose of the Study:

  • To demonstrate deterministic charge-state control of modified divacancies in 4H silicon carbide.
  • To investigate the dynamics of charge-state conversion and spin-charge coupling.

Main Methods:

  • Utilized 1064 nm laser for ionization and 914 nm laser for recharging.
  • Quantitatively characterized ionization and recharging rates as functions of laser power.
  • Investigated spin-dependent ionization processes.

Main Results:

  • Achieved reversible conversion between neutral and negative charge states.
  • Determined laser power-dependent ionization and recharging rates.
  • Revealed spin-dependent ionization, indicating spin-charge dynamics coupling.

Conclusions:

  • Provided key insights into the charge-state physics of modified divacancies.
  • Paved the way for spin readout via spin-to-charge conversion or photocurrent detection.
  • Enabled deterministic control of quantum properties in silicon carbide.