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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Stable Atomic Magnetometer in Parity-Time Symmetry Broken Phase.

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Researchers discovered that atomic spin diffusion in gradient magnetic fields can be harnessed for high-precision measurements. By observing a parity-time (PT) phase transition, they developed a stable magnetometer for detecting weak signals in challenging environments.

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Area of Science:

  • Physics
  • Quantum Mechanics
  • Magnetic Resonance Imaging

Background:

  • Spin diffusion in nonuniform magnetic fields typically broadens magnetic resonance signals, limiting sensitivity and spectral resolution.
  • This phenomenon hinders applications in fields like magnetic resonance spectroscopy.

Purpose of the Study:

  • To investigate the potential of using spin diffusion in gradient magnetic fields as a resource for high-precision measurements.
  • To explore the parity-time (PT) phase transition of diffusive spins and its implications for signal detection.

Main Methods:

  • Observation of the parity-time (PT) phase transition in diffusive spin systems subjected to gradient magnetic fields.
  • Analysis of spin precession dynamics in both normal and PT symmetry broken phases.

Main Results:

  • In low gradient fields (normal phase), spin diffusion causes dissipation of spin precession.
  • Increasing the field gradient induces a PT transition to a symmetry broken phase, leading to split spin precession frequencies due to spatial eigenmode localization.
  • These split frequencies enable a stable magnetometer insensitive to control parameter drift.

Conclusions:

  • Spatial degrees of freedom of atoms can be leveraged as a resource in magnetic resonance experiments, contrary to previous understanding.
  • The developed spin system acts as a stable magnetometer, capable of detecting extremely weak signals in imperfectly controlled environments.