Following the logic of Figure 25.6,

sketch (no calculation necessary) the wave functions of the energy basis states at the top of the second energy band and the bottom of the third energy band in a periodic square well potential with high barriers. First establish that these wave functions are both periodic in x ? x⁺. Also remember that inside the potential wells the wave functions should resemble the second and third excited states of a square well potential respectively.

Transcribed Image Text:

W (a) -L - -A = L+W→ (b)