Experimental signatures of a Kitaev quantum spin liquid in α-RuCl3
Date :
Thursday, July 16th, 2020 10:30 am - 12:00 pm
Place :
https://sites.google.com/view/cevis2020/registration (We will send the zoom link to the registered participants)
Lecturer : Takasada Shibauchi Affiliation : University of Tokyo Committee Chair : Masaki Oshikawa (ex.63275)
e-mail: oshikawa@issp.u-tokyo.ac.jp
e-mail: oshikawa@issp.u-tokyo.ac.jp
In this presentation I will show our recent results of thermal conductivity and specific heat measurements in the high-field paramagnetic state of Kitaev material α-RuCl3. The field dependence of thermal Hall conductivity shows a plateau behavior with the value close to one half of quantized thermal Hall effect of electron systems [1], whose sign changes with field angle as expected from the Chern number in the Kitaev model [2]. The most recent specific heat measurements provide thermodynamic evidence for field-angle dependent Majorana gap, which demonstrates the bulk-edge correspondence in a Kitaev quantum spin liquid.
[1] Y. Kasahara et al., Nature 559, 227-231 (2018).
[2] T. Yokoi et al., arXiv:2001.01899.
Chair: Yuki Motome
Note : 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
(Published on: Monday July 13th, 2020)