The 14th QLC seminar

Speaker：Prof. Eun-Gook Moon (Korea Advanced Institute of Science and Technology (KAIST), Korea)
Date & Time : Thursday, January 30, 2020.　13:30～
Place：room 614, Science Hall, Nagoya University
Title：Exotic phenomena in superconductors : topological superconductivity and unconventional nematicity

Abstract：
Superconducting material may host exotic behaviors of physical quantities. For example, recent experiments in cuprates such as YBCO and Hg1201 show unconventional nematicity behaviors. In the first part of the seminar, we consider a topological superconductor with Fermi surfaces of Bogoliubov quasi-particles, so-called Bogoliubov Fermi surfaces, and discuss its instability. Implication to correlated systems such as FeSe and Sr2RuO4 is pointed out. In the second part, we discuss nematicity of Fe-based superconducting material with tetragonal symmetry, Ba1−xRbxFe2As2, by using a microscopic model with two orbitals. Limitation of a conventional phenomenological theory is emphasized, and plausible theories for the exotic nematicity are introduced.

Committee Chair：Hiroshi KONTANI（Nagoya University）