Chapter 8-1spin/course/105F/solid state physics-Ch8-1.pdf · Chapter 8-1 . 熱敏電阻器. Ge ......
20
Chapter 8-1
Transcript of Chapter 8-1spin/course/105F/solid state physics-Ch8-1.pdf · Chapter 8-1 . 熱敏電阻器. Ge ......
Chapter 8-1
熱敏電阻器
Ge Si
ħ << Eg
ħ = Eg - ħ
Crystal momentum kc
electron crystal momentum kC , phonon momentum K creation of phonon
absorption of phonon
(T = 0)
Direct Transition Indirect Transition
kc = 0
ħ << Eg
ħ = Eg - ħ
Crystal momentum kc
electron crystal momentum kC , phonon momentum K creation of phonon
absorption of phonon
Optical absorption to determine the (direct) energy gap of InSb
Direct Transition at 0.23V
OF AN ELECTRON IN AN ENERGY BAND
(1)
(2)
(3)
Ch. 8,
Eq. 43, 49
B
B
KE
(1) Without interaction with the crystal potential
(2) With interaction with the crystal potential
Free electrons
Then, we sum over all possible G
for a given G,