"Bosons on the Triangular Lattice: Mott Transition in the Presence of Geometrical Frustration"Anton Burkov , Harvard University [Host: Victor Galitski]
ABSTRACT:
Interest in the behavior of interacting bosons on twodimensional lattices
has recently been revived by the experimental realization of
superfluidinsulator 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
conductinginsulating 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 4:00 PM Physics Building, Room 204 Note special time. Note special room. 
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