Consider now the following symmetric double-barrier structures with: (1) barrier

Question

Consider now the following symmetric double-barrier structures with: (1) barrier height = 0.3 eV, barrier width = well width = 4 nm: (2) barrier height = 0.2 eV, barrier width = well width = 4 nm: (3) barrier height = 0.4 eV, barrier width well width = 4 nm. Answer the following questions: How many quasi-bound states are in the well? Discuss the sharpness of the resonance as a function of the barrier height. Comment on the energy of the quasi-bound state variation with the variation of the barrier height.

Explanation / Answer

By using the PCPBT tool we conclude that,

There is only one quasi- bound states in all the three cases

The higher the barrier sharper the resonant state as it starts to resemble the real bound state, when barrier height is low resonance is broad.

The energy of the quasi bound state increases with increasing height of the barrier as the structure resembles infinite well structure

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