Informal Theory Seminar:: Nonequilibrium superfluid spin transport through magnetic insulators
Date :
Friday, April 3rd, 2015 4:00 PM - 5:00 PM
Place :
Seminar Room 5 (A615), 6th Floor, ISSP
Lecturer : Dr. So TAKEI Affiliation : UCLA Physics & Astronomy Committee Chair : Prof. Takeo Kato (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).
(Published on: Tuesday March 31st, 2015)