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SUMMARY:Unitary Fermi gas\, unitary Bose gas: theory and experiments - Fel
 ix Werner\, Laboratoire Kastler Brossel\, ENS Paris
DTSTART:20140606T131500Z
DTEND:20140606T144500Z
UID:TALK51523@talks.cam.ac.uk
CONTACT:Dr G Moller
DESCRIPTION:By "unitary gas"\, we mean a quantum N-body problem with inter
 actions having a vanishing range and an infinite scattering length\, in 3 
 space dimensions.\nThis fundamental model is relevant for nuclear physics 
 at a quanlitative level\, and for ultracold atomic gases at a Feshbach res
 onance at a high-precision level. \nFirst\, I will review Efimov's analyti
 cal solution of the unitary three-body problem\, and the resulting dramati
 c differences between the bosonic and fermionic cases (due to the occurenc
 e or non-occurence of the Efimov effect). \nThen\, I will discuss recent w
 ork about the unitary Fermi gas\, using a "bold diagrammatic Monte Carlo" 
 approach [1\,2\,3]\, and about the unitary Bose gas\, using Efimov's ansat
 z for the 3-body problem [4\,5].\n\n======= references =======\n\n[1] K. V
 an Houcke\, F. Werner\, E. Kozik\, N. Prokofev\, B. Svistunov\, M. J. H. K
 u\, A. T. Sommer\, L. W. Cheuk\, A. Schirotzek\, M. W. Zwierlein\, "Feynma
 n diagrams versus Fermi-gas Feynman emulator"\, Nature Phys. 8\, 366 (2012
 )\n\n[2] K. Van Houcke\, F. Werner\, E. Kozik\, N. Prokof'ev\, B. Svistuno
 v\, "Contact and Momentum Distribution of the Unitary Fermi Gas by Bold Di
 agrammatic Monte Carlo"\, arXiv:1303.6245 \n\n[3] K. Van Houcke\, F. Werne
 r\, N. Prokof'ev\, B. Svistunov\, "Bold diagrammatic Monte Carlo for the r
 esonant Fermi gas"\, arXiv:1305.3901\n\n[4] B. S. Rem\, A. T. Grier\, I. F
 errier-Barbut\, U. Eismann\, T. Langen\, N. Navon\, L. Khaykovich\, F. Wer
 ner\, D. S. Petrov\, F. Chevy\, C. Salomon\, "Lifetime of the Bose Gas wit
 h Resonant Interactions"\, Phys. Rev. Lett. 110\, 163202 (2013)\n\n[5] Y. 
 Castin\, F. Werner\, "Third virial coefficient of the unitary Bose gas"\, 
 Canadian Journal of Physics 91 (2013) 382\n\n\n
LOCATION:TCM Seminar Room (530)\, Cavendish Laboratory
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