William Angerer - Department of Physics and Astronomy - University ...

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r: b
S
~
r b
I
rs
~ r b
I
0)1
rdefect
I
0)1
0)
0)
rdefect
I
A
Figure 6.10: Three photon processes in Ga~ involving a midgap defect state. In Fig.
A, the resonant transition is a transition between the defect state and the Ga).;" valence
band. In Fig. 8, the resonant transition is a transition between the conduction band
and the defect state. The virtual transitions are labeled by symmetry and by energy.
e.g. liw 1 . The process is resonant for W = WI + W2.
B
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