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VERSION:2.0
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PRODID:UW-Madison-Physics-Events
BEGIN:VEVENT
SEQUENCE:1
UID:UW-Physics-Event-9049
DTSTART:20250203T170000Z
DTEND:20250203T180000Z
DTSTAMP:20260413T203733Z
LAST-MODIFIED:20250127T153834Z
LOCATION:5310 Chamberlin
SUMMARY:Emergent collective phenomena in macroscopic and mesoscopic sy
 stems\, Atomic Physics Seminar\, Dr. Zhenjie Yan\, Univ. California Be
 rkeley
DESCRIPTION:From the persistent electric currents in superconductors t
 o the synchronized motion of a flock of birds\, emergent collective be
 haviors arise ubiquitously from the interactions between constituents 
 in many-body ensembles. Ultracold atom experiments\, with their precis
 ely tunable interactions and well-controlled initial states\, provide 
 a powerful platform to explore these cooperative phenomena in quantum 
 many-body systems. In this talk\, I will present examples of collectiv
 e effects in both macroscopic and mesoscopic regimes\, drawn from my r
 ecent works.  First\, I will discuss thermal transport in a macroscopi
 c strongly interacting Fermi gas\, a system that poses significant cha
 llenges for existing theoretical and computational methods. The heat t
 ransport reveals a striking signature of a superfluid phase transition
 : while heat propagates diffusively in the normal phase\, it propagate
 s as a wave—known as second sound—below the superfluid transition 
 temperature. Next\, I will introduce recent work on constructing a mes
 oscopic system atom-by-atom using optical tweezers\, with precise cont
 rol over interactions mediated by photon exchange in an optical cavity
 . This platform enables the study of self-organization and symmetry br
 eaking. The atom array reveals distinctive hallmarks of mesoscopic phy
 sics\, such as the dependence of the critical point and the state life
 time on the system size. Finally\, I will briefly outline my future re
 search plans to develop quantum systems that are robust against noise 
 and decoherence using atoms and light for emulating many-body systems 
 and carrying out computational tasks.
URL:https://www.physics.wisc.edu/events/?id=9049
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