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Seminars for the week of
11/23/2009 - 11/27/2009

Atomic
Monday, November 23 Reserved
3:30 PM, Room 204
Physics Building

Condensed Matter
Monday, November 23
Note Special Day
Andrew James [Host: Austen Lamacraft]
3:30 PM, Room 204
Note Special Time and/or Room
University of Virginia
Physics Building “Non-Fermi liquid fixed point for an imbalanced gas of fermions in 1+ ε dimensions”
ABSTRACT:
 We consider a two species gas of fermions with population imbalance. Using the renormalisation group in d=1+ ε dimensions, we show that for spinless fermions and ε > 0 a fixed point appears at finite attractive coupling where the quasiparticle residue Ζ vanishes, and identify this fixed point with the transition to Larkin--Ovchinnikov--Fulde--Ferrell order (inhomogeneous superconductivity). When the two species of fermions also carry spin degrees of freedom we find a repulsive fixed point, indicating a transition to spin density wave order.

Nuclear
Tuesday, November 24 OLIVER JAHN [Host: Blaine Norum]
3:00 PM, Room 313
Note Special Time and/or Room
University of Mainz
Physics Building “The GDH Experiment at MAMI”
ABSTRACT:
 The GDH sum rule connects ground state properties of the nucleon with helicity-dependent cross sections. To investigate these cross sections on the deuteron, experiments have been carried out by the A2-Collaboration at the Mainz Microtron (Germany) in 1998 and in 2003, using circularly polarized photons on a polarized d-butanol target. The latest analysis results and the status of the GDH experiment with the Crystal Ball detector are reported.


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