, Harvard University
[Host: Victor Galitski]
Interest in the behavior of interacting bosons on two-dimensional lattices
has recently been revived by the experimental realization of
superfluid-insulator transition of cold atoms in an optical lattice.
Such models are also interesting from a broader prospective since
they provide a simpler context to explore general aspects of
conducting-insulating transitions of electrons.
I will talk about our recent study of the interplay between Mott
localization and geometrical frustration in a system of interacting
bosons on the triangular lattice. Frustration prevents localization
into simple ordered states, that can be determined by minimizing
only the interaction energy. A variety of unconventional states
thus become possible, notably supersolids and valence bond ordered
insulators. I will describe a general phenomenological theory of these
states, based on a duality transformation from bosons to vortices
and compare this theory with numerical simulations.
Condensed Matter Seminar
Thursday, December 1, 2005
Physics Building, Room 204
Note special time.
Note special room.
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