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Physics Colloquium: Jack Harris, "Topological physics with coupled oscillators: beyond Berry's phase via exceptional points"

Physics Colloquium: Jack Harris, "Topological physics with coupled oscillators: beyond Berry's phase via exceptional points"
When Sep 12, 2018
from 04:00 PM to 05:00 PM
Where MR418
Contact Name
Contact Phone 212-650-7443
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Jack Harris

Associate Professor, Yale University Departments of Physics and Applied Physics

 

TITLE: Topological physics with coupled oscillators: beyond Berry's phase via exceptional points

ABSTRACT: A small number of linearly coupled, classical simple harmonic oscillators is often considered to be a trivial physical system. Thus it was a remarkable surprise when Berry and others showed that the phases of such oscillators possess robust geometric and topological features. More recently it has been appreciated that adding dissipation to such a system opens an entirely new form of topological control. This "non-Hermitian" control has a novel feature: it operates on the oscillators' energy (rather than their phase). In this talk I will describe how it is that dissipation (which is usually a disadvantage) results in a qualitatively new form of topological control. I will also describe the realization of these effects in a simple optomechanical system.