Tuesday, March 16, 1999, 4 p.m.
Physics Building, Room 1410

Superconductor-insulator transition in two dimensions

Boris Altshuller

(NEC Research Institute and Princeton University)

Abstract:  This talk is a brief review of the combined effect of disorderb and Coulomb interaction between electrons in a thin film on the phenomenon of superconductivity.  This effect violates the famous Anderson theorem which states that the ordinary s-wave superconductivity does not feel disorder.  We will discuss this effect within the framework of the general theory of disordered and chaotic systems.  Using the basic ideas of this theory we will interpret and discuss existing theoretical statements on the superconductor-insulator transition.  It turns out that to adequately interpret the variety of the experimental data, one has to take into account large scale static inhomogeneity of the films.  For this reason, in addition to the theory of continuous films, we will discuss the theory of the superconductor-insulator transition in granular films and Josephson arrays.  We will also review the experimental situation.

Host: Richard Prange

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