Home >  研究会等 > Asymmetric magnetic scattering and transport phenomena in chiral magnets

Asymmetric magnetic scattering and transport phenomena in chiral magnets

日程 : 2020年11月11日(水) 10:30 am - 12:00 pm 場所 : https://sites.google.com/view/cevis2020/registration (We will send the zoom link to the registered participants) 講師 : Hiroaki Ishizuka 所属 : Tokyo Institute of Technology 世話人 : 押川正毅 (ex.63275)
e-mail: oshikawa@issp.u-tokyo.ac.jp

Magnetism has a significant effect on electron transport phenomena. A classic example is the anomalous Hall effect, where the magnetism produces a Hall current proportional to the ferromagnetic moment. The studies on magnetism-related transport phenomena have mostly focused on two cases. The first is the low-temperature magnetically-ordered phase, in which the deformation of the electronic band and electron-magnon scattering are dominant. Another is the high-temperature paramagnetic phase, where the effect of magnetic moments is well described as the scattering by a single magnetic impurity. In contrast, recent experiments find unique transport phenomena at an intermediate temperature comparable to the magnetic transition temperature. In this talk, I discuss the magnetic scattering by two- and three-spin clusters, which gives the leading order correction to the magnetic scattering theory in the high-temperature limit. These corrections contribute to the electron transport in the intermediate temperature where the short-range magnetic correlation develops. We find that the spin correlation in the spin cluster brings about various asymmetric scattering. The asymmetric scatterings produce various transport phenomena such as extrinsic-type anomalous Hall effect and nonreciprocal current. These results are consistent with recent experiments and suggest a new direction in realizing a large anomalous Hall effect and nonreciprocal response.

Chair: Gil Young Cho

This event is jointly organized by the Korea Institute for Advanced Study and the University of Tokyo. “Correlated Electrons Virtual International Seminars (CEVIS)” https://sites.google.com/view/cevis2020/home

 


(公開日: 2020年11月06日)