  Plutonium is a critically important material as the behavior of its
5f-electrons stands midway between the metallic-like itinerant character of the
light actinides and localized atomic-core-like character of the heavy
actinides. The delta-phase of plutonium (delta-Pu), while still itinerant, has
a large coherent Kondo peak and strong electronic correlations coming from its
near-localized character. Using sophisticated Gutwiller wavefunction and
dynamical mean-field theory correlated theories, we study for the first time
the Fermi surface and associated mass renormalizations of delta-Pu together
with calculations of the de Haas-van Alphen (dHvA) frequencies. We find a large
(200%) correlation-induced volume expansion in both the hole and electron
pockets of the Fermi surface in addition to an intermediate mass enhancement.
All of the correlated electron theories predict, approximately, the same hole
pocket placement in the Brillouin zone, which is different from that obtained
in conventional density-functional band-structure theory, whereas the electron
pockets from all theories are in, roughly, the same place.
