#### Statistical Mechanics Seminar - Philip W. Anderson, Some new results on the ground state of the strong coupling (solid)limit of the Bose-Hubbard Mod

Abstract: The Mott insulator is accepted as the appropriate ground manifold for the strongly interacting Fermion Hubbard model, with solid

He-3 as the simplest exemplar. It is a manifold because of the spin degrees of freedom, which order antiferromagneticallly due to atom exchange, below a critical temperature. No corresponding effect of exchange has been known for the Bose solid. I show that in fact the Bose-Hubbard model solid has a corresponding manifold of phase degrees of freedom which can conduct particle currents and which exhibit an ordering transition. The possible applicability to the observed “supersolidity “ phenomena in solid He-4 will be discussed.

**Location:**
Fine 224

**Date/Time: **09/28/11
at
2:00 pm
- 09/28/11
at
3:30 pm

**Category: **Statistical Mechanics Seminar

**Department: **Physics