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PRODID:UW-Madison-Physics-Events
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SEQUENCE:0
UID:UW-Physics-Event-2824
DTSTART:20130314T150000Z
DURATION:PT1H0M0S
DTSTAMP:20260412T150839Z
LAST-MODIFIED:20130308T135312Z
LOCATION:5310 Chamberlin
SUMMARY:Non-equilibrium many-body dynamics with cold atoms in optical 
 lattices\, R. G. Herb Condensed Matter Seminar\, Andrew Daley\, Univer
 sity of Pittsburgh
DESCRIPTION:Over the last ten years\, experimental advances with ultra
 cold quantum gases in optical lattices have made possible the study of
  various interesting many-body phenomena that are difficult to observe
  in solid-state systems. Not only do these systems allow the investiga
 tion of interesting quantum phases\, but they offer unique opportuniti
 es for the study of non-equilibrium dynamics\, addressing fundamental 
 questions such as the mechanisms behind thermalization in closed quant
 um systems or the behavior of a system after a quantum quench. I will 
 discuss our recent work in coherent and dissipative many-body dynamics
 \, focused around these ideas as well as the key challenge in experime
 nts of producing many-body states with low temperature and entropy. In
  this context it is important to characterize and control the competin
 g heating mechanisms in the experiment\, which can arise from various 
 sources\, including incoherent scattering of the lattice light (sponta
 neous emissions)\, and typically have effects that depend strongly on 
 the detailed characteristics of the many-body state. Spontaneous emiss
 ions tend to localize atoms on particular lattice sites\, in that sens
 e acting as a type of local quantum quench. Computing dynamics describ
 ed by a many-body master equation\, we investigate such quenches for b
 osons moving in 1D in the lattice system. We identify both regimes in 
 which simple observables relax rapidly to a thermal distribution at hi
 gher temperature\, and other regimes where the system settles on a sho
 rt timescale to a non-thermal state. I will also discuss adiabatic sta
 te preparation techniques\, and how they could be useful in preparing 
 many-body states in a variety of systems\, including crystalline state
 s of Rydberg atoms. 
URL:https://www.physics.wisc.edu/events/?id=2824
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