Can Spins Flip in an EPR Experiment?

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SUMMARY

The discussion centers on the confusion regarding spin flips in an EPR (Einstein-Podolsky-Rosen) experiment. It clarifies that while the absorption of electromagnetic waves can induce spin flips, the energy conservation equation \(\hbar \omega = g_{spin} \mu_B B_0\) must be satisfied. Additionally, it emphasizes that spin flips cannot occur through an electromagnetic dipole field, and only optical transitions with \(\Delta m_s = 0\) are allowed in the presence of Zeeman splitting. For further understanding, Stephen Bundell's book "Magnetism in Condensed Matter" is recommended for its insights on Electron Spin Resonance (ESR).

PREREQUISITES
  • Understanding of EPR (Einstein-Podolsky-Rosen) experiments
  • Familiarity with Zeeman splitting and its implications
  • Knowledge of electromagnetic wave interactions with spins
  • Basic concepts of Electron Spin Resonance (ESR)
NEXT STEPS
  • Study the principles of Zeeman splitting in quantum mechanics
  • Explore the role of electromagnetic waves in spin dynamics
  • Learn about optical transitions and their selection rules
  • Read Stephen Bundell's "Magnetism in Condensed Matter" for detailed insights on ESR
USEFUL FOR

Physicists, quantum mechanics students, and researchers interested in spin dynamics and EPR experiments.

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hello

I got al little bit confused about spins flipping in an EPR experiment. As far as I know, the idea of EPR is to measure the absorption of an electromagnetic wave induced by spin flips if the energy is conserved by
\hbar \omega = g_{spin} \mu_B B_0.
But now I heard several times that a spin cannot be flipped by an electromagnetic dipole field and only optical transitions that include
\Delta m_s = 0
are permitted if there is zeeman splitting.
So how do spins flip then?

Thank you for all answers!
 
Last edited:
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check out Stephen Bundell book, "Magnetism in condensed matter". It has a good discussing on ESR.
 

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