# An introduction to spin glasses

#### An introduction to spin glasses

- Event time: 11:30am
- Event date: 16th October 2013
- Speaker: Dr Peter Mottishaw (School of Physics & Astronomy, University of Edinburgh)
- Location: Room 2511, James Clerk Maxwell Building (JCMB) James Clerk Maxwell Building Peter Guthrie Tait Road Edinburgh EH9 3FD GB

### Event details

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?### About Statistical Physics and Complexity Group meetings

This is a weekly series of informal talks focussing on some theoretical aspect of Condensed Matter, Biological, and Statistical Physics..

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