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Condensed Matter Colloquium Thursday, November 3, 2011

Summary: Condensed Matter Colloquium
Thursday, November 3, 2011
2 pm, Room 1201
Refreshments at 1:30 pm in Room 1305F
Lesik Motrunich
California Institute of Technology
Metal-like phases ("Bose-metals") of frustrated spins and bosons
This seminar will describe recent progress in understanding of quantum phases
of 2D correlated boson or spin systems which exhibit "Bose-metal" type phases
with gapless excitations residing on surfaces in momentum space. A spin liquid
phase with a Fermi surface of spinons is one example of interest, being
potentially relevant to the organic spin liquid materials -(ET)2Cu2(CN)3 and
EtMe3Sb[Pd(dmit)2]2. I will discuss frustrated spin and boson models with ring
exchanges that may stabilize such phases, in particular in the vicinity of the Mott
transition as is the case in the organic materials. Controlled numerical studies of
such models on quasi-1D ladders and in some limiting 2D cases strongly suggest
that Bose-metal phases are indeed present in 2D. I will also describe very
recent studies of new classes of gapless spin liquid phases where exact
analytical treatments are possible.


Source: Appelbaum, Ian - Department of Physics, University of Maryland at College Park


Collections: Engineering; Materials Science