送交者: Amsel 于 2009-04-14, 04:58:35:
回答: I'm not sure how you solid state physics guys explain that. 由 Amsel 于 2009-04-14, 04:38:27:
wikipedia
Within an energy band, energy levels are so numerous as to be a near continuum. First, the separation between energy levels in a solid is comparable with the energy that electrons constantly exchange with phonons (atomic vibrations). Second, it is comparable with the energy uncertainty due to the Heisenberg uncertainty principle, for reasonably long intervals of time. As a result, the separation between energy levels is of no consequence.