On Sat, Jun 27, 2015 at 2:35 PM, Bob Cook <[email protected]> wrote:
In my concept elements of a system—a QM system—are entangled and act > coherently and instantaneously. Any two systems whose elements couple in > any way constitute a coherent, although weakly coupled system. For > example, introduction of an electron into a semiconductor instantaneously > changes the energy level of every other electron in that semiconductor no > matter their distance from the new electron just introduced. This seems mistaken. I would have expected there to be a wavefront for the propagation of the new Fermi level along the semiconductor at some speed up to the speed of light in a vacuum following upon the stimulation of an electron. Also, I believe a typical semiconductor system has so many electrons at so many energy levels that it is no longer useful to think of it as a quantum mechanical system -- hence the treatment of the band structure as a set of continuous ranges. Is this understanding incorrect? Eric
