Transcript
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Chapter 8-1
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Ge Si
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ħ << Eg
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(T = 0)
Vertical transition
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Direct Transition Indirect Transition
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ħ << Eg
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Optical absorption to determine the (direct) energy gap of InSb
Direct Transition at 0.23V
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OF AN ELECTRON IN AN ENERGY BAND
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Without interaction with the crystal potential
With interaction with the crystal potential
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Then, summation over all possible G
for a given G
is