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This Week at Physics

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Event Number 4804

  Thursday, April 12th, 2018

R. G. Herb Condensed Matter Seminar
Photonic analogues of topological superconductors
Time: 10:00 am
Place: 5310 Chamberlin
Speaker: Aashish Clerk, McGill University
Abstract:
Interest continues to grow in photonic and phononic analogues of topological electronic phases. In most cases, these systems are non-interacting, and have the same band structure and edge state structure as their fermionic counterparts. In this talk, I’ll discuss recent theory work in my group showing how parametric “two-photon” driving can be used to realize a new class of photonic topological systems that superficially resemble topological superconductors. Unlike standard particle-number conserving models of non-interacting topological phases, these new systems exhibit crucial differences between their bosonic and fermionic versions. Further, one can realize a situation where all bulk states are stable, but where edge states are guaranteed to be unstable. Such a system can form the basis of a useful device: a topologically-protected amplifier which operates close to the fundamental limits set by quantum mechanics. I’ll discuss how these ideas could be realized in a variety of different experimental platforms, including superconducting quantum circuits and optomechanics.
Host: Vavilov
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