Why Do Spin Flips at Fermi Level Occur?

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SUMMARY

Spin flips at the Fermi level occur due to the Pauli exclusion principle, which states that no two electrons can occupy the same quantum state simultaneously. In the context of the discussion, H1 represents a perturbation Hamiltonian that influences spin states. The Fermi level is critical because it delineates occupied and unoccupied electron states; thus, spin flips can only happen at this level where the potential for occupation exists. This understanding is essential for grasping electron behavior in quantum systems.

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  • Understanding of quantum mechanics principles
  • Familiarity with the concept of the Fermi level
  • Knowledge of perturbation theory in quantum physics
  • Basic grasp of the Pauli exclusion principle
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johnsmi
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Hi,

I have come across a sentance in an article which I do not quite understand.

flips of the spin due to H1 occur only at the Fermi level

H1 is just a perturbation Hamiltonian.

Why will spin flips only occur at the Fermi level?

Thank you
 
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I'll take a wild guess that it is because the would-be flipped spin state is already occupied by another electron, for the states below the Fermi level. So the Pauli principle prevents it.
 

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