理論インフォーマルセミナー:Nonequilibrium superfluid spin transport through magnetic insulators
日程 :
2015年4月3日(金) 16:00 - 17:00
場所 :
物性研究所本館6階 第5セミナー室 (A615)
講師 : Dr. So TAKEI 所属 : UCLA Physics & Astronomy 世話人 : 加藤 岳生 (63255)
e-mail: kato@issp.u-tokyo.ac.jp
e-mail: kato@issp.u-tokyo.ac.jp
Theoretical proposals for realizing and detecting superfluid spin transport in anisotropic ferromagnet and antiferromagnet insulators are presented [1, 2]. The central concept of interest is collective, nearly dissipationless transmission of spin, which could in practice be injected and detected through the spin Hall effect. We consider in detail a negative electron-drag experiment that can be used to probe the signatures of spin superfluidity, and quantitative estimates for the experiment are provided. Possible detrimental effects that could destroy the superfluid state are also discussed.
[1] So Takei and Yaroslav Tserkovnyak, Phys. Rev. Lett. 112, 227201 (2014).[2] So Takei, Bertrand Halperin, Amir Yacoby, Yaroslav Tserkovnyak,
Phys. Rev. B 90, 094408 (2014).
(公開日: 2015年03月31日)