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SUMMARY:Normal State of Highly Polarized Fermi Gases: Full Many-Body Treat
 ment - Kayvan Sadegzadeh
DTSTART:20091106T153000Z
DTEND:20091106T160000Z
UID:TALK20673@talks.cam.ac.uk
CONTACT:Daniel Cole
DESCRIPTION:"Phys. Rev. Lett. 101\, 050404 (2008) ":http://link.aps.org/do
 i/10.1103/PhysRevLett.101.050404 \n\nWe consider a single spin down atom w
 ithin a Fermi sea of spin up atoms. We elucidate by a full many-body analy
 sis the quite mysterious agreement between Monte Carlo results and approxi
 mate calculations taking only into account single particle-hole excitation
 s. It results from a nearly perfect destructive interference of the contri
 butions of states with more than one particle-hole pair. This is linked to
  the remarkable efficiency of the expansion in powers of hole wave vectors
 \, the lowest order leading to perfect interference. Going up to two parti
 cle-hole pairs gives an essentially perfect agreement with known exact res
 ults. Hence our treatment amounts to an exact solution of this problem.
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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