Quantum Spin Glasses

H. Rieger and A.P. Young
Review article for XIV Sitges Conference: Complex Behavior of Glassy Systems (1996)

Ising spin glasses in a transverse field exhibit a zero temperature quantum phase transition, which is driven by quantum rather than thermal fluctuations. They constitute a universality class that is significantly different from the classical, thermal phase transitions. Most interestingly close to the transition in finite dimensions a quantum Griffiths phase leads to drastic consequences for various physical quantities: for instance diverging magnetic susceptibilities are observable over a whole range of transverse field values in the disordered phase.

Paper: Postscript

Peter Young's Home Page

Physics Home Page