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SUMMARY:High spin at low temperatures - Dr Christoph Becker\, Institut fü
 r Laserphysik\, University of Hamburg
DTSTART:20140425T140000Z
DTEND:20140425T150000Z
UID:TALK52103@talks.cam.ac.uk
CONTACT:Leona Hope-Coles
DESCRIPTION:A fundamental question in many-body physics is how the collect
 ive behavior of many microscopically interacting particles gives rise to m
 acroscopic properties such as superconductivity\, giant magnetoresistance\
 , or superfluidity. \nUltracold quantum gases are ideal candidates to addr
 ess these questions because they offer excellent control over many crucial
  experimental parameters\, such as the interaction strength\, the dimensio
 nality of the system and also the spin of the individual particles. \nIn m
 y talk I will present a detailed survey of the physics of quantum degenera
 te Fermions with a large internal spin of F=9/2.\nStarting with an experim
 ental introduction to spin changing dynamics on the two-particle level I w
 ill present how a macroscopically large Fermi sea can behave as a single e
 ntity in spin space undergoing coherent collective oscillations in the spi
 n degree of freedom.\nI will discuss the influence of finite temperature \
 nas well as higher order collisional processes which counteract the system
 s tendency to evolve coherently and can lead to the occurrence of meta-sta
 ble spin configurations.\nFurthermore large spin quantum gases can be util
 ized to explore new aspects of the relaxation dynamics of a many-body syst
 em far from equilibrium.\nWe have performed measurements that reveal sever
 al collisional processes occurring on distinct time scales \nand moreover 
 show that by tuning the magnetic field the character of an initial subset 
 of spin states can be tuned from an open to a closed system.\n
LOCATION:Pippard Lecture Theatre\, Cavendish Laboratory\, Department of Ph
 ysics
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