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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
10:40

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Phonon-assisted spin diffusion in solids

Dolinsek1, Cereghetti, Kind

  • 1J. Stefan Institute, Jamova 39, Ljubljana, SI-1000, Slovenia.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|September 26, 2000
PubMed
Summary

Lattice vibrations, specifically acoustic phonons, enhance spin flip-flop transition rates in solids by modulating interspin distances. This phonon-assisted spin diffusion introduces temperature dependence, unlike rigid lattice models.

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Area of Science:

  • Solid-state physics
  • Quantum mechanics
  • Materials science

Background:

  • Spin diffusion is crucial for understanding magnetic phenomena in solids.
  • Dipolar coupling between spins influences spin dynamics.
  • Lattice vibrations (phonons) can interact with spins, affecting their behavior.

Purpose of the Study:

  • To calculate the spin flip-flop transition rate in solids considering spectral spin diffusion.
  • To investigate the role of lattice vibrations (acoustic phonons) in enhancing this transition rate.
  • To determine the temperature dependence of phonon-assisted spin diffusion.

Main Methods:

  • Calculation of the spin flip-flop transition rate using the golden rule.
  • Employing the Debye approximation for phonon density of states.
  • Analyzing one-phonon (direct) and two-phonon (Raman) processes.

Main Results:

  • Long-wavelength acoustic phonons enhance the spin flip-flop transition rate by modulating interspin distances.
  • Phonon-assisted spin diffusion exhibits temperature dependence, unlike rigid lattice systems.
  • Direct processes lead to a linear temperature dependence near T=0, while two-phonon processes show T(2) dependence above the Debye temperature and T(7) dependence near T=0.
  • Raman processes significantly dominate phonon-assisted spin flip-flop transitions.

Conclusions:

  • Lattice vibrations play a significant role in spin dynamics, particularly in spin diffusion.
  • The temperature dependence of spin flip-flop transitions is strongly influenced by phonon interactions.
  • Understanding these phonon-spin interactions is key for applications in magnetic resonance and quantum information processing.