8:00 AM–10:24 AM, Thursday, May 29, 2008
Nittany Lion Inn - Ballroom CDE
Chair: Charles Clark, National Institute of Standards and Technology
Abstract ID: BAPS.2008.DAMOP.I1.2
8:36 AM–9:12 AM
Chris H. Greene
(JILA and Department of Physics, University of Colorado, Boulder, Colorado 80309-0440)
The behavior of a two-component dilute Fermi gas exhibits an interesting dependence on the mass ratio between the two species. Our study tackles this system with 3-20 particles, using two independent techniques. First, an essentially exact diagonalization for 3-6 particles determines both the ground state and also the pattern of excited state energies, and our analysis permits an extraction of the dimer-dimer scattering length and effective range. Secondly, the nature of the system ground state is studied as a function of the mass ratio and the number of particles, up to N=20, using fixed-node diffusion Monte Carlo (DMC) techniques. By using two different solution techniques in their overlapping range of applicability from N=3-6, we are able to assess the accuracy of the nodal surface employed in the fixed-node DMC calculation. Physical properties such as the excitation gap will be analyzed over this range of particle number, and the intriguing unitarity limit is also considered.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2008.DAMOP.I1.2