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SUMMARY:Lattice modulation of a two-dimensional superfluid: could it be…
 the Higgs particle? - Prof. Lode Pollet\, LMU München
DTSTART:20130509T131500Z
DTEND:20130509T141500Z
UID:TALK44144@talks.cam.ac.uk
CONTACT:Dr G Moller
DESCRIPTION:We present solid evidence for the existence of a Higgs boson i
 n two-dimensional relativistic field theories based on analytically contin
 ued results from quantum Monte Carlo simulations of the Bose-Hubbard model
  in the vicinity of the superfluid-Mott insulator quantum critical point\,
  featuring emergent particle-hole symmetry and Lorentz-invariance. The Hig
 gs boson\, seen as a well-defined low-frequency resonance in the spectral 
 density\, is quickly pushed to high energies in the superfluid phase and d
 isappears by merging with the broad secondary peak at the characteristic i
 nteraction scale. Simulations of a trapped system of ultra-cold Rb-87 atom
 s demonstrate that the low-frequency resonance feature is lost for typical
  experimental parameters\, while the characteristic frequency for the onse
 t of strong response is preserved. \n\nRef: Phys. Rev. Lett. 109\, 010401 
 (2012) and arXiv:1301.3139
LOCATION:TCM Seminar Room\, Cavendish Laboratory
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