Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session R41: Spin Dynamics II
8:00 AM–11:00 AM,
Thursday, March 7, 2019
BCEC
Room: 209
Sponsoring
Units:
GMAG DMP
Chair: Victor Brar, University of Wisconsin-Madison
Abstract: R41.00013 : Berry curvature and topological edge modes for coupled waves between magnons and electromagnetic waves*
10:24 AM–10:36 AM
Presenter:
Akihiro Okamoto
(Physics, Tokyo Institute of Technology)
Authors:
Akihiro Okamoto
(Physics, Tokyo Institute of Technology)
Shuichi Murakami
(Physics, Tokyo Institute of Technology)
Ryuichi Shindou
(School of Physics, Peking University)
In this presentation, we consider coupled waves between magnons and electromagnetic waves in a ferromagnet. The Berry curvature is enhanced at the crossing point of dispersions, as is the case for other coupled waves such as magnons with the dipolar hybridization and magnetoelastic waves. The Chern number, i.e. the integral of the Berry curvature for the coupled waves between the magnon and the electromagnetic wave is quantized. We find that the hybridization gap in this case is topological. Therefore, there exist topological chiral edge modes inside this gap. We also present an emergence of edge modes at an interface between two topologically different regions.
*This work was partly supported by a Grant-in-Aid for Scientific Research on Innovative Area, “Nano Spin Conversion Science” (Grant No. 26100006).
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