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SUMMARY:A phase microscope for quantum gases - Prof Christof Weitenberg\, 
 TU Dortmund
DTSTART:20250923T130000Z
DTEND:20250923T140000Z
UID:TALK236131@talks.cam.ac.uk
CONTACT:Dr Ulrich Schneider
DESCRIPTION:Coherence properties are central to quantum systems and are at
  the heart of phenomena such as superconductivity. Here we study coherence
  properties of an ultracold Bose gas in a two-dimensional optical lattice 
 across the thermal phase transition [1]. To infer the phase coherence and 
 phase fluctuation profile\, we use direct matter-wave imaging [2] of highe
 r Talbot revivals as well as a new phase microscope based on a site-resolv
 ed mapping of phase fluctuations to density fluctuations during matter-wav
 e imaging. We observe the algebraic decay of the phase correlations in the
  superfluid phase and a linear temperature increase of the exponent. These
  techniques will also allow studying coherence properties in strongly-corr
 elated quantum systems with full spatial resolution.\n\n[1] J. C. Brüggen
 jürgen\, M. S. Fischer\, C. Weitenberg\, A phase microscope for quantum g
 ases\, arXiv:2410.10611 (2024).\n[2] L. Asteria\, H. P. Zahn\, M. N. Kosch
 \, K. Sengstock\, C. Weitenberg\, Quantum gas magnifier for sub-lattice-re
 solved imaging of 3D quantum systems\, Nature 599\, 571–575 (2021).\n\n
LOCATION:Ray Dolby Centre\, 2nd floor seminar room\, PHY-RDC B2.002 
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