Seminars This Week

		    THEORETICAL PHYSICS COLLOQUIUM


    Speaker		    :    Bhargavi Srinivasan
                                 (Laboratoire de Physique Quantique,
                                 Universite Paul Sabatier, 
                                 Toulouse, France)

    Topic		    :    Transition to an insulating phase
                                 in the disordered,  attractive
                                 Hubbard model 

    Day, Date & Time	    :    Friday, December 13, 2002
			         at 2:30 p.m.
                              
    Place		    :    AG 69


Please note the change in time.
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Abstract
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We study the disordered, attractive Hubbard model in two and three
dimensions for spin-1/2 fermions on a lattice. Projector quantum Monte
Carlo (PQMC) simulations show that at moderate disorder, increasing
the attractive interaction leads to a transition from delocalised
superconducting states to the insulating phase of localised pairs. In
three dimensions, this transition takes place well within the metallic
phase of the single-particle Anderson model.