报 告 人：邹小龙 清华大学深圳国际研究生院
报告题目：Emergent optical properties of 2D materials
报告时间：2022年4月30日 下午14：00
腾讯会议: 183 969 378
报告人简介
Dr. Xiaolong Zou received his Ph.D. in physics from Tsinghua University, China, in 2011. After working as a research associate at Rice University, Houston, TX, USA, he joined Tsinghua-Berkeley Shenzhen Institute (TBSI), part of Tsinghua Shenzhen International Graduate School, Tsinghua University, as an Assistant Professor in 2016 and promoted to Accociate Professor in 2019. Dr. Zou's current research focuses on the theoretical description of magnetic and optical properties of 2D materials and their coupling, as well as the growth mechanism of 2D materials. He has published over 90 papers in peer-refereed journals, including 1 Nature, 2 Nature Materials, 6 Nature Communications, 3 Materials Today, 1 Accounts of Chemical Research, 5 Advanced Materials, 8 Nano Letters, 11 ACS Nano. These papers receive total citations over 10000 and an H-index of 40. He has been invited to write book/chapter by several prestigious publishers, including Science Press, and Cambridge University Press.
报告摘要
Two-dimensional (2D) materials are ideal platforms for exploring emerging optical behaviors, at unprecedentedly high temperature and feasible control. Here, we report our systematic study on the effects of different band topologies and moiré superlattices on the optical properties of 2D systems. Different 2D materials with characteristic band topologies can be adopted to achieve various long-sought high-temperature excitonic quantum behaviors, including electron-hole liquid in a new-phase (γ-phase) group IV monochalcogenides (This new phase has been synthesized recently.), excitonic Bose-Einstein Condensation in TiS3, and saddle excitons in β-phase group IV monochalcogenides. By introducing twist in trilayer black phosphorous (TTbP) with strong interlayer coupling and deep 1D moiré potential, we observed remarkably strong moiré optical resonances even at a large twist angle of 19°. Combining twisting, pressure, and electric field, controllable tuning of bandgap, bandwidth, and dimension of moiré bands can be achieved, thus establishing TTbP as an attractive platform to explore strongly correlated moiré electronic and excited states in different dimensions, as well as tunable opto-electronic applications.
计算方法与软件国际中心面向国家对原创科学计算方法和软件的战略需求，瞄准计算科学领域中的重大科技前沿，依托吉林大学物理学院成立于2018年5月。中心发展原创的科学计算方法，研制我国自主产权的科学计算软件系统，为我国培养科学计算领域高端人才，打造世界一流的计算科学研究中心、人才培养中心和学术交流中心。
围绕物理、化学、材料和地学等学科领域对科学计算方法与软件的迫切需求，中心设置如下各具特色、互为支撑的四个研究部: 材料设计方法，第一性原理方法，材料物性模拟，计算电磁学。通过引育优秀人才，中心已凝聚形成一支具有国际视野、科研能力强、育人水平高的师资队伍。目前拥有固定人员12人，包含长江/杰青/万人/优青/海外高层次青年人才7人。
