The discussion revolves around the concept of the band gap in solid-state physics and its relationship to the principle of least energy. Participants explore whether the existence of a band gap contradicts the idea that systems tend to occupy the lowest available energy states.
Participants express differing views on whether the band gap violates the principle of least energy, and the discussion remains unresolved with multiple competing perspectives presented.
There are limitations in the discussion regarding the definitions of energy states and the implications of the Fermi level, which are not fully explored or agreed upon.
motoroller said:How does the band gap not violate the principle of least energy? Surely the most favourable states are those with minimum available energy - but there is a gap!
ZapperZ said:This is a bit puzzling. Why would the existence of a band gap violate principle of least energy? Even if there's no band gap, there are still electrons not in the "lowest" energy state, because those states are filled. That's why you have a Fermi level. So why would there be any problem when there's a band gap?
Zz.
motoroller said:But the states in the band gap aren't filled?