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SUMMARY:Symmetry breaking and bifurcations of exciton-polariton condensate
 s - Prof. Yuri Rubo
DTSTART:20161025T140000Z
DTEND:20161025T150000Z
UID:TALK68503@talks.cam.ac.uk
CONTACT:Dr Hamid Ohadi
DESCRIPTION:Symmetry breaking play a key role in equilibrium phase transit
 ions\, where low symmetry phases appear with lowering the temperature. Les
 s is understood for driven-dissipative systems out of equilibrium\, where 
 the formations of symmetry broken states can be sometimes counterintuitive
 . First\, this effect is illustrated for two Huygens pendulum clocks in th
 e presence of strong nonlinearity. In this system\, the synchronized motio
 n of the oscillators at low driving regime is expected to bifurcate into s
 ymmetry broken dynamics\, with the amplitude of one oscillator being large
 r than the amplitude of the other. Then\, I will show that similar physics
  can take place for coupled condensates of non-equilibrium bosons or in dr
 iven dissipative lasing systems\, in particular for condensates of exciton
 -polaritons\, where the strong interactions lead to formation of specific 
 many-body states. In particular\, this results in period doubling\, reduce
 d symmetry of the condensate state with respect to the underlying potentia
 l\, and to appearance of spontaneous currents.  Finally\, I will discuss t
 he recent experimental observations of the symmetry breaking bifurcations 
 in one-dimensional superlattices of exciton-polaritons and in polarization
  degree of freedom for trapped exciton-polariton condensates.
LOCATION:Kapitza Building Seminar Room (16)\, Cavendish Laboratory\, Depar
 tment of Physics
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