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Wednesday, April 18 2018

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Macroscopic phase coherence is one of the most remarkable manifestations of quantum mechanics, yet it seems to be theinevitable ground state of interacting many-body systems. In the last two decades, the familiar examples of superfluid He and conventional superconductors have been joined by exotic and high temperature superconductors, ultra-cold atomic gases, both bosonic and fermionic, and recently systems of excitons, magnons, and exciton-photon superpositions called polaritons, the subject of this talk.