Can someone tell me what Doping away from half Filling means? I see it everywhere. Although I can't find referance to it in Kittel or Mermin, although I might not be looking hard enough. I have and idea of what it is. Half filling refers to the doping where the Brillouin Zone is half holes and half half occupied states. So....doping away from half filling is going to be defined by, x=1/2+p, with x being the percentage of filled states in the Brillouin Zone and p being the Doping away from half filling. I'm probably right about this, but im not sure, so its been bugging me. Any help would be apreciated, thanks.