报告题目：Solving intriguingproblems of condensed matter physics using epitaxial stress and inelasticspectroscopy

报告人：Ambrose Seo

Department of Physics andAstronomyUniversity of Kentucky

Abstract:Spectroscopic investigations are essential to understand intriguingphenomena in many areas of physics. Inparticular, recent advanced spectroscopic tools such as resonant inelasticx-ray scattering and photoemission spectroscopy play an important role in condensedmatter physics.While research on epitaxialthin-films is expected to reveal hidden novel physical properties, previous inelasticspectroscopic investigations have been unable to detect these properties due tothe small cross-section.

In this seminar, I will discuss advanced inelastic light scattering (Raman spectroscopic)studies of two-magnon dynamics in Sr₂IrO₄thin-films asfunctions of epitaxial stress and temperature.Recent experimental studies of Sr₂IrO₄thin-filmshave contradicted the widely-accepted Glazer description of octahedral tiltingand rotation in perovskite oxides. However,our experimental observations and density functional theory calculations show thatthe multi-orbital nature of theJ_eff= ½ state is crucial to understanding the magnetic and electronic properties of5dtransition-metal oxides. This study demonstrates how advanced spectroscopictools combined with epitaxially stressed samples can improve ourfundamentalunderstanding of stronglycorrelated, spin-orbit coupled electrons, enabling us to explore the novelphase diagrams of these systems.

时间：2019年5月22日（周三）上午10:00

地点：前卫南区唐敖庆楼C区603报告厅

举办单位：超硬材料国家重点实验室

物理学院

尊龙凯时省物理学会

中国物理学会高压物理专业委员会