University of Minnesota
School of Physics & Astronomy

Condensed Matter Seminar

Wednesday, May 1st 2019
1:25 pm:
Speaker: Jack Harris, Yale University
Subject: A pedagogical introduction to the emergence of topology in non-Hermitian dynamics

A collection of coupled linear oscillators is widely regarded as a trivial physical system. Nevertheless, in recent years it has become evident that weak loss (or gain) in these systems can result in a variety of qualitative surprises - even in the purely linear regime. Effects that have attracted considerable attention include: PT symmetry breaking, exceptional points, non reciprocity, and topological control. I will describe a simple framework that unites these "non-Hermitian" effects and explains why topology emerges generically in damped coupled linear oscillators. I will discuss the application of these concepts in classical systems and in quantum systems. Lastly, I will describe an optomechanical experiment that offers a natural way to realize generic non-Hermiticity.

Faculty Host: Paul Crowell

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