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SUMMARY:Few-fermion quantum systems: How may are many? - Selim Jochim (Hei
 delberg University)
DTSTART:20121001T143000Z
DTEND:20121001T160000Z
UID:TALK40260@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:In our experiments we deterministically prepare ultracold ense
 mbles of 1-10\nfermionic Lithium-6 atoms in two different spin states. We 
 tune the\ninterparticle interaction using Feshbach resonances and trap the
  atoms in a\nquasi 1-dimensional optical potential.\nIn my talk I will pre
 sent results obtained with a strongly imbalanced\nsample\, for which we pr
 epare a mixture of one single minority spin down\nparticle embedded in a s
 ample of 1-5 majority spin up atoms\, and measure the\ninteraction energy 
 as a function of particle number and repulsive\ninteraction strength. We o
 bserve that this energy very quickly converges to\nthe many particle limit
  in one dimension.\nIf we tune the repulsion beyond infinity we find ferro
 magnetic correlations\,\nand thus realize the Stoner model of itinerant fe
 rromagnetism in a finite\nsystem.\n\n
LOCATION:Rutherford building\, Seminar Room B
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