The concepts and theoretical methods developed from the study of spin glasses have found application in many areas, for example neural networks, optimisation problems, real glasses and polymers in a random medium. In this theory club talk I will try to shed light on some key concepts of spin glasses. It will not include any replica calculations - but will mention the approach and time permitting introduce the Parisi order parameter.The outline is as follows; 1. What is a spin glass? - examples of spin glasses - what are the essential ingredients - quenched vs thermal averages - the replica "trick" 2. Edwards Anderson model and order parameter 3. Free energy landscape and pure states - ergodicity breaking, pure states, symmetry breaking. - Ising ferromagnet vs Ising spin glass - where does the Parisi order parameter fit in?
This is a roughly weekly series of didactical blackboard talks focussing on some theoretical aspect of Condensed Matter, Biological, and Statistical Physics..