Perturbing Hamiltonian optical absorption in semiconductors

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SUMMARY

The discussion focuses on the optical absorption in direct gap semiconductors, specifically addressing the role of the perturbing Hamiltonian as an oscillating perturbation, akin to an electromagnetic wave. The complexity of treating the electromagnetic field quantum mechanically versus classically is highlighted, emphasizing that while the absorption of a single photon can be analyzed, it introduces additional complications. The conversation underscores the necessity of understanding quantum mechanics in the context of semiconductor physics.

PREREQUISITES
  • Quantum mechanics fundamentals
  • Direct gap semiconductor properties
  • Electromagnetic wave theory
  • Perturbation theory in quantum mechanics
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  • Study quantum mechanical treatment of electromagnetic fields
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Physicists, materials scientists, and researchers focusing on semiconductor optics and quantum mechanics will benefit from this discussion.

dyn
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Hi
I am looking at the problem of optical absorption in direct gap semiconductors. It seems like the perturbing Hamiltonian is an oscillating perturbation , ie. an electromagnetic wave. Why can't the problem be treated as the absorption of a single particle , ie. a photon ?
 
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Of course it can, but it is more complicated to treat the electromagnetic field quantum mechanically than classically.
 

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