Regensburg 2010 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 8: CE: (General) Theory
TT 8.12: Talk
Monday, March 22, 2010, 17:00–17:15, H21
Bilayer Hubbard model for 3He: a cluster dynamical mean-field calculation — K.S.D. Beach1 and •F.F. Assaad2 — 1Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2G7 — 2Institut für theoretische Physik und Astrophysik, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
Inspired by recent experiments on bilayer 3He, we consider a bilayer Hubbard model on a triangular lattice.
For appropriate model parameters, we observe a band-selective Mott transition at a critical chemical potential,
µc, corresponding to the solidification of the fermions in the first layer. The growth of the effective mass
on the metallic side (µ < µc) is cut off by a first order transition in which the first layer fermions
drop out of the Luttinger volume and their spin degrees of freedom become locked in a spin singlet state.
These results are obtained from a cluster dynamical mean-field calculation on an eight-site cluster
with a quantum Monte Carlo cluster solver.
http://xxx.lanl.gov/abs/0905.1127