Large-scale quantum phenomena in spin systems

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Large-scale quantum phenomena are particularly interesting in condensed matter systems, although they have also been studied in particle theory and cosmology. Their theoretical understanding needs extensive results from the theory of decoherence and non-equilibrium processes in the environment. The present work focuses on cerain statistical mechanical models (notably on models of spin networks coupled to environments modelled by oscillator or spin baths), and on their application to real systems. Such systems include networks or arrays of magnetic molecules or rare earth spins, or of supeconducting SQUIDS. The models also can be applied to quantum spin glasses or dipolar glasses. Finally, in this project we will also look at solid He-3, in whihc we believe that spectacular quantum phenomena involving macroscopic domain walls may be observable.