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ehrenfest
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[SOLVED] direct absorption proces
My solid-state physics book (Kittel) says the following in the chapter about semiconductors:
"In a direct absorption process the threshold of continuous optical absorption at frequency [itex]\omega_g[/itex] measure the band gap [itex]E_g = \hbar \omega_g[/itex]",
Apparently this is a definition, so it is hard to argue with it, but can someone explain what the "threshold of continuous optical absorption" means and how that could measure the band gap?
Homework Statement
My solid-state physics book (Kittel) says the following in the chapter about semiconductors:
"In a direct absorption process the threshold of continuous optical absorption at frequency [itex]\omega_g[/itex] measure the band gap [itex]E_g = \hbar \omega_g[/itex]",
Apparently this is a definition, so it is hard to argue with it, but can someone explain what the "threshold of continuous optical absorption" means and how that could measure the band gap?