Exceptional Points in an Optomechanical System

16.03.2017 13:30 - 14:30

Talk by David Mason, Yale University, USA

Exceptional points (EPs) are degeneracies occuring in open systems described by complex eigenvalues.  Near an EP, the system eigenvalues exhibit a topological structure that leads to interesting behavior with respect to closed adiabatic cycles.  Here, I will present our work on exploring EP phenomena in an optomechanical system.  Using nearly-degenerate mechanical modes of a Si3N4 membrane, we demonstrate energy transfer via encircling of an EP, as well as non-reciprocal behavior arising from a breakdown of adiabaticity.  I'll also discuss recent work on achieving the same physics with non-degenerate modes, using a bichromatic drive scheme.

Schrödingerroom, 4th Floor, Boltzmanngasse 5, 1090 Wien