And actually, I stand by the my quote in your signature. You forgot to mention the lattice and valence electrons is all (kind of fundamental to solid state physics.
If photons don't have mass, they how do they interact with electrons other than electromagnetically?. Electrons have charge as well as mass ....
Atoms don't ionize in a cooled optical lattice (a lens), and the whole point of cooling is to prevent such transitions (or ejections) since they contribute to the opotical noise. What one needs is for the lattice to be as regular as possible, so the electrons on the outer shells are influenced only slightly by light, so the photons are not effected by jiggling, but only by the spacing of the electrons on the surfaces of atoms in the lattice. The less the electrons jiggle, the less they interfere with light, and the more the lattice and photon waves interact linearly,
In a semiconductor, the point is to cool it so that unwanted transitions are eliminated, and the ONLY creation of holes is due to photons (which knock them out of their holes). But if photons don't have mass, then they still must interact with electrons electromagnetically (i.e., their charges)..
You're a Vllage Idiot and an asshole.
Mod Note: General comments of unhappiness moved to Cage Match.