Nov 21, 2002
Quantum phases and critical points of correlated metals
Subir Sachdev, Yale University
The Doniach phase diagram has formed the basis of our interpretation of
experiments in metals with local moments for many years. It contains the
heavy Fermi liquid state, satisfying Luttinger's theorem, and a state with
magnetic order in the local moments; the two phases are separated by a
spin-density-wave critical point, described by a free critical field theory.
I will describe recent proposals for new phases in this phase diagram, some
characterized by topological order, and which can violate the conventional
Luttinger theorem. Separating the phases of this expanded phase diagram are
interesting new strongly coupled quantum critical points.
I discuss implications for experiments, some of which show scaling
behavior characteristic of strongly-coupled critical points.
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