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SUMMARY:Topology in lattices of semiconductor microcavities - Jacqueline B
 loch (Université Paris-Saclay & CNRS)
DTSTART:20240215T140000Z
DTEND:20240215T150000Z
UID:TALK205048@talks.cam.ac.uk
CONTACT:Bo Peng
DESCRIPTION:Topology is a branch of mathematics\, which enables classifyin
 g geometrical objects according to global properties labels by an integer 
 (genus number). Interestingly topology has appeared as a power tool in phy
 sics\, providing profound new insights into physical phenomena such as the
  quantum Hall effect or the valley Hall effect. The geometrical objects to
  which these mathematical concepts apply in the context of condensed matte
 r physics are the energy bands\, and topological invariants called Chern n
 umbers can be deduced from the eigenstates. Non-zero Chern numbers are res
 ponsible for anomalous velocity\, or for the appearance of robust edge sta
 tes at the border of a finite size system.\n\nWith the development of synt
 hetic platforms\, concepts of topology have been pushed far beyond what ex
 ists in actual material. The exploration of topology in presence of non-li
 nearity\, non hermiticity\, higher dimension an emerging field of research
  with flourishing theoretical proposals to be emulated experimentally.\n\n
 In the present talk\, I will present some of our recent experiments perfor
 med using lattice of driven dissipative non-linear resonator. We use semic
 onductor microcavities operating in the strong exciton-photon regime\, pla
 tform of choice for investigating topological physics. Indeed\, due to the
 ir part-light part-matter character\, exciton polaritons\, the eigenstates
  of the system\, can undergo i) spin-orbit coupling (photon part)\, while 
 simultaneously experiencing ii) non-linearities and time-reversal symmetry
  breaking as a consequence of their susceptibility to magnetic fields (exc
 iton part).\n\nI will show how we can realize a full tomography of Bloch e
 igensates and experimentally retrieve Berry curvature and Chern numbers. U
 sing the driven dissipative nature of the sytem\, exotic non-linear steady
  states can be stabilized with novel emerging topological properties. We w
 ill discuss the physics of topological solitons and propose an interaction
  induced topological pump will.
LOCATION:TCM Seminar Room
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