Ruhr-University Bochum, Germany

报告摘要：

Recently discovered high-T_c superconductivity in pressurized bilayer nickelate bulk crystals La₃Ni₂O₇ (La-327) and their thin films under compressive strain are believed to be driven by the non-phononic repulsive interaction. Depending on the strength of the interlayer repulsion, the symmetry of the superconducting order parameter is expected to be either d-wave or sign-changing bonding-antibonding s±-wave order parameter, respectively. In my presentation I will analyze the peculiar features of the electronic structure of these systems and the interplay of multiple orbitals in the normal and the superconducting states. Discussing various superconducting states we show that the bilayer structure of the spin response allows to elucidate the role of the interlayer interaction and the nature of the Cooper-pairing in a very efficient way. We further analyze the sensitivity of the obtained results with respect to the potential electronic structure modification and applied pressure.

报告人简介：

Ilya M. Eremin graduated from Kazan State University in 1996 and received his Ph.D. degree in Physics from the Kazan State University in 1999. He was an Alexander von Humboldt Research fellow at the Free University of Berlin, and become a Junior-Professor (2005-2010) at the Max-Planck Institute of Physics of Complex Systems, a University Professor (2010-2019) and then a Chair Professor (2020-present) at the Ruhr-University Bochum, Germany. His interests lie in general field of quantum many-body theory and its application in condensed matter with confined geometries and related systems, mostly focusing on the strongly correlated electron systems and unconventional superconductors.

报告地点：M236会议室

联系人：罗会仟 研究员