chapter 8-1spin/course/105f/solid state physics-ch8-1.pdf · chapter 8-1 . 熱敏電阻器. ge ......
TRANSCRIPT
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Chapter 8-1
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熱敏電阻器
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Ge Si
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ħ << Eg
ħ = Eg - ħ
Crystal momentum kc
electron crystal momentum kC , phonon momentum K creation of phonon
absorption of phonon
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(T = 0)
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Direct Transition Indirect Transition
kc = 0
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ħ << Eg
ħ = Eg - ħ
Crystal momentum kc
electron crystal momentum kC , phonon momentum K creation of phonon
absorption of phonon
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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
(1)
(2)
(3)
Ch. 8,
Eq. 43, 49
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B
B
KE
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(1) Without interaction with the crystal potential
(2) With interaction with the crystal potential
Free electrons
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Then, we sum over all possible G
for a given G,