Fast nuclear spin hyperpolarization of phosphorus in silicon

Area of Science:

• Condensed Matter Physics
• Quantum Information Science
• Materials Science

Background:

• Nuclear spin hyperpolarization enhances signal detection in various applications.
• Traditional methods for achieving hyperpolarization are often complex or limited in efficiency.
• The Overhauser effect offers a potential route to non-equilibrium nuclear spin polarization.

Purpose of the Study:

• To experimentally demonstrate a novel method for achieving significant nuclear spin hyperpolarization.
• To investigate the potential of a light-driven Overhauser process for enhancing nuclear polarization.
• To explore the implications of high nuclear polarization for quantum information processing and MRI.

Main Methods:

• Utilizing a nonequilibrium Overhauser process driven by white light irradiation.
• Experimentally measuring nuclear spin polarization of phosphorus donors in silicon.
• Conducting experiments at cryogenic temperatures (1.37 K) and high magnetic fields (8.5 T).

Main Results:

• Achieved over 68% negative nuclear polarization of phosphorus donors in silicon.
• Demonstrated a polarization level significantly exceeding thermal equilibrium.
• Reached the maximum polarization with a time constant of approximately 150 seconds.

Conclusions:

• The demonstrated method provides an efficient route to substantial nuclear spin hyperpolarization.
• High levels of nuclear polarization are achievable using accessible white light irradiation.
• This technique holds significant promise for advancing quantum information processing and magnetic resonance imaging technologies.