For 10 points, identify this physicist, who developed a theory of superconductivity with Vitaly Ginzburg.
One model developed by this man gives the probability of a transition between a two-level quantum mechanical system in terms of the diabatic coupling constants. Another behavior named for him occurs when electrons traveling at speeds approximately equal to the phase speed of a wave do not participate in resonant interactions with the wave; that phenomenon thus allows for collisionless decay of plasma waves, which is called his namesake "damping." He names a value at which the coupling constant of a quantum field interaction blows up, and his experiments on liquid helium led to a phenomenological theory of superfluidity. For 10 points, identify this physicist, who developed a theory of superconductivity with Vitaly Ginzburg. 
One model developed by this man gives the probability of a transition between a two-level quantum mechanical system in terms of the diabatic coupling constants.
Lev Davidovich {Landau} [accept Clarence {Zener} until first sentence]