PT-symmetry in macroscopic magnetic structures

Autor:	Lee, J. M., Kottos, T., Shapiro, B.
Rok vydání:	2014
Předmět:	Condensed Matter - Mesoscale and Nanoscale Physics Mathematical Physics Nonlinear Sciences - Chaotic Dynamics
Druh dokumentu:	Working Paper
Popis:	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. Comment: a supplement (containing 3 figures) which explains how one can introduce experimentally amplification in a ferromagnetic film is also included
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1408.3285 Zobrazit plný text záznamu View this record from Arxiv