|Jul30-12, 07:48 AM||#1|
What is the momentum of an electron?
I was learning about indirect band gap and it says that when the electron comes down from upper energy level to lower energy level it emits photon(which I can understand) but in order to conserve the momentum it emits phonons (which I couldn't understand).
Can you please help me with this?
Thanks a lot.
|Jul30-12, 10:20 AM||#2|
Try wikipedia here:
Note the diagrams near the top of the page.....
I don't know much about phonon quasi particles except that they are associated with vibrating structures like lattices.....
[QUOTE]....photons cannot carry crystal momentum,...in an indirect band gap material, the process must also involve the absorption or emission of a phonon, where the phonon momentum equals the difference between the electron and hole momentum.
|momentum of electron|
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