University of Minnesota
School of Physics & Astronomy

Condensed Matter Seminar

Thursday, March 27th 2008
1:25 pm:
Condensed Matter Seminar in 210 Physics
Speaker: J.V. Porto, NIST
Subject: Cold atoms in optical lattices: the 2D Mott insulator and a new approach to optical lattice engineering

I will describe two sets of experiments using ultra cold atoms in optical lattices. In one, we accurately measure the condensate fraction in a 2D Bose-Hubbard system as a function of the lattice depth and compare to theory. In the other, we demonstrate a method of adiabatically dressing spin-dependent lattices, a technique that can in principle generate non-trivial sub-wavelength structure. Non-adiabatic spin-flip loss is one of the limiting processes in this lattice, and we measure spin-flip loss under a variety of conditions. 

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