TY - JOUR
T1 - Nonreciprocal magnons in noncentrosymmetric magnets
AU - Sato, Taku J.
AU - Matan, Kittiwit
N1 - Funding Information:
Acknowledgments The authors thank T. Arima for guiding us to this intriguing topic, T. Hong and Y. Zhao for continuous support in neutron experiments, Y. Motome for fruitful discussions, P. Piyawongwatthana for checking the spinwave calculations, and all our collaborators, D. Okuyama, A. Kikkawa, Y. Taguchi, Y. Tokura, G. Gitgeatpong, Y. Qiu, L. W. Harriger, and N. P. Butch, for various contributions. We also thank Y. Onose, S. Seki, and S. V. Gregoriev for their kind permissions to reproduce the figures. This work at IMRAM was partly supported by Grants-in-Aid for Scientific Research (Nos. 24224009 and 17K18744) from Japan Society for the Promotion of Science and by the research program “Dynamic alliance for open innovation bridging human, environment, and materials”. KM is partly supported by the Thailand Research Fund Grant Number RSA6180081 and the Thailand Center of Excellence in Physics (ThEP). The stay of KM at IMRAM, Tohoku University, was supported by the “JSPS Invitational Fellowships for Research in Japan”.
Publisher Copyright:
© 2019 The Physical Society of Japan
PY - 2019
Y1 - 2019
N2 - In a noncentrosymmetric crystalline material, the propagation of particles or quasiparticles can be nonreciprocal, i.e., the left-moving and right-moving (quasi)particles become inequivalent. In a noncentrosymmetric magnet, such nonreciprocity is expected for magnons, the quantized collective spin fluctuations that propagate as a wave in a magnetically ordered phase. Even though the nonreciprocal propagation of the magnons was theoretically proposed decades ago, experimentally, little attention has been given to the phenomenon, partly because of its putative subtleness originating from the weak relativistic spin–orbit coupling. The situation has markedly changed recently, as the possibility of measuring and controlling a magnon spin current in noncentrosymmetric magnets begins to gain wider recognition. In this article, we will review recent progress in the detection of the nonreciprocal magnons in noncentrosymmetric magnets. Particular emphasis will be placed on the neutron scattering studies where the magnon dispersion is directly measured in a microscopic length scale.
AB - In a noncentrosymmetric crystalline material, the propagation of particles or quasiparticles can be nonreciprocal, i.e., the left-moving and right-moving (quasi)particles become inequivalent. In a noncentrosymmetric magnet, such nonreciprocity is expected for magnons, the quantized collective spin fluctuations that propagate as a wave in a magnetically ordered phase. Even though the nonreciprocal propagation of the magnons was theoretically proposed decades ago, experimentally, little attention has been given to the phenomenon, partly because of its putative subtleness originating from the weak relativistic spin–orbit coupling. The situation has markedly changed recently, as the possibility of measuring and controlling a magnon spin current in noncentrosymmetric magnets begins to gain wider recognition. In this article, we will review recent progress in the detection of the nonreciprocal magnons in noncentrosymmetric magnets. Particular emphasis will be placed on the neutron scattering studies where the magnon dispersion is directly measured in a microscopic length scale.
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U2 - 10.7566/JPSJ.88.081007
DO - 10.7566/JPSJ.88.081007
M3 - Article
AN - SCOPUS:85068667862
VL - 88
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
SN - 0031-9015
IS - 8
M1 - 081007
ER -