PT-symmetry in macroscopic magnetic structures
Mesoscale and Nanoscale Physics
2014-08-22 v1 Mathematical Physics
math.MP
Chaotic Dynamics
Abstract
We introduce the notion of PT-symmetry in magnetic nanostructures and show that they can support a new type of non-Hermitian dynamics. Using the simplest possible set-up consisting of two coupled ferromagnetic films, one with loss and another one with a balanced amount of gain, we demonstrate the existence of a spontaneous PT-symmetry breaking point where both the eigenfrequencies and eigenvectors are degenerate. Below this point the frequency spectrum is real indicating stable dynamics while above this point it is complex signaling unstable dynamics.
Cite
@article{arxiv.1408.3285,
title = {PT-symmetry in macroscopic magnetic structures},
author = {J. M. Lee and T. Kottos and B. Shapiro},
journal= {arXiv preprint arXiv:1408.3285},
year = {2014}
}
Comments
a supplement (containing 3 figures) which explains how one can introduce experimentally amplification in a ferromagnetic film is also included