报告题目：Ferromagnetic resonance as a novel probe for non-Fermi liquids and infinite critical boson non-Fermi liquids

报告人：张啸天博士  中国科学院大学

报告时间：2023年5月24日（周三）15:00

报告地点：理六栋302会议室         邀请人：朱起忠

报告内容：

Landau’s Fermi liquid theory is the foundation of modern condensed matter physics. Strong correlation mediated by critical bosons renders Landau’s quasiparticle picture broken down which amounts to a non-Fermi liquid (NFL) metal. Distinct types of NFLs can be classified according to the momentum carried by the critical boson. This leads to the ferromagnetic/anti-ferromagnetic quantum criticality and the NFL state in the associated quantum critical regime. In the first part of the talk, I will introduce a novel type of NFL induced by infinite many bosons that simultaneously become critical on a continuous manifold. This constitutes the scenario of infinity scatter infinity which is studied by complementary theoretical frameworks. The physical consequence for the infinite critical boson NFL is demonstrated in both three and two spatial dimensions.In the second part, I turn to the investigation of using ferromagnetic resonance (FMR) as a new probe for the strongly correlated phases of matter without quasiparticles. Properties of the NFL metallic phase can be read off from the modulations on the FMR. The characteristic frequency and temperature dependence of the FMR modulations is analytically derived for the Ising-nematic quantum criticality-induced NFL.

专家简介：

About the speaker: Dr. Xiao-Tian Zhang graduated from the School of Gifted Young at the University of Science and Technology of China in 2013. He received his Ph.D degree from the International Center for Quantum Materials at Peking University in 2019 under the supervision of Prof. Ryuichi Shindou. During 2019-2022, he worked in the group of Prof. Gang Chen at the University of Hong Kong as a postdoc. Starting in 2023, he joined the Kavli Institute for Theoretical Sciences, UCAS with a director’s postdoctoral fellowship.