The Conwell-Weisskopf and Brooks-Herring models describe a phenomenon named for these entities that, at low temperatures, is the dominant term in Matthiessen's formula for charge carrier mobility.
Two di5ferent models of these entities are related by the Schrie5fer-Wol5f (SHREE-fer VULF) transformation. A procedure for computing these entities' thermodynamic properties consists of iteratively adding degrees of freedom along a logarithmically discretized, semi-in3nite chain. The Conwell-Weisskopf and Brooks-Herring models describe a phenomenon named for these entities that, at low temperatures, is the dominant term in Matthiessen's formula for charge carrier mobility. Kenneth Wilson developed the numerical renormalization group method to explain the existence of 3nite minimum resistivity in systems containing these entities, which create virtual bound states that facilitate electron tunneling in the Anderson model. Zone re3ning decreases the concentration of these entities in semiconductors, where they act as acceptors or donors. For 10 points, name these crystal defects that result from the substitution of foreign atoms.
Two di5ferent models of these entities are related by the Schrie5fer-Wol5f (SHREE-fer VULF) transformation.
impurities [or dopants; or doping agents; accept ionized impurity scattering; accept substitutional defects before "substitution" and prompt therea7ter; prompt on crystal defects or lattice defects]