what is a quantum well

[kaustubh]

can someone tell me what is a quantum well. plz dont give me wikipedia or any other similar encyclopedia links..(cuz i have seen them and i am still not clear).

also it would be helpful if someone cud explain what is a phonon..

thank you

 

[yjkwon57]

Quantum well is the space where electrons can stay at lower energy than the outside of the space.

 

[kaustubh]

could you please elaborate on that like where it is generally used and also what is a phonon ????

 

[pmonon]

one instance of a quantum well is for electron around a nucleus in an atom. Phonon is the quantum of heat or mechanical vibration.