Professor
My work has been mostly in the area of many body theory. Some examples are: 1) Critical phenomena in liquid crystals. We use renormalization group to study the phase transition between isotropic and nematic phases, especially in the neighborhood of the Landau point at which isotropic oblate, prolate and biaxial phases all coexist. 2) Many body effects in the optical absorption of metals. We study the effects of dynamical screening of the excitonic interaction. This screening shows singularities of the type "infrared catastrophe" which also appear in the self-energy studied previously. However, to have a consistent theory, all singularities must be included simultaneously.
Revised September 28, 1995