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學術報告:Ultrafast Laser Spectroscopy of Two-Dimensional Materials

來源:  發布時間:2019-06-05 17:23:29 點擊次數:

報告題目: Ultrafast Laser Spectroscopy of Two-Dimensional Materials

報告人: 趙輝  (University of Kansas, U.S.)

報告時間:2019614 上午10:00

報告地點:物理學院新樓五樓多功能廳


報告摘要:

In this seminar, recent studied on optical and electronic properties of two-dimensional materials by ultrafast laser spectroscopy will be presented. Two-dimensional materials, such as graphene, MoS2, WS2, and black phosphorus are promising materials for future electronic and optoelectronic applications. As a powerful experimental method with high time resolution, ultrafast laser spectroscopy has been used to study two-dimensional materials by many groups worldwide. Several topics will be discussed in this seminar. First, we will present studies of nonlinear optical properties of two-dimensional materials, such as second harmonic generation and two-photon absorption. The former allows detection of the crystal orientation and symmetry of two-dimensional monolayers while the latter can measure the optical bandgap of exciton binding energy of two-dimensional materials. Second, transient absorption microscopy technique will be discussed, which has been used to study photocarrier and exciton dynamics. Third, all-optical injection of ballistic currents in ReS2 studies of the ballistic charge transport will be introduced. Fourth, by performing transient absorption measurements with polarization resolution, spin and valley dynamics of excitons will be discussed. Finally, by performing transient absorption measurements with layer selectivity, we revealed ultrafast electron transfer in hetero-materials formed by stacking two or more two-dimensional materials together. These ultrafast laser measurements of two-dimensional materials and their heterostructures revealed fundamental electronic and optical properties of these materials that are important for their applications as new forms of functional materials.



報告人簡介:

趙輝教授于1990-2000年就讀于北京交通大學并于2000年獲得博士學位。其后在德國的卡爾斯魯厄大學和美國的愛荷華大學從事博士后研究。2007年起任職美國堪薩斯大學物理與天文學系,2010年獲美國國家科學基金會CAREER獎,2017年晉升為正教授。趙輝教授的研究方向為納米材料的激光光譜學。近年來主要從事二維材料超快激光光譜學的研究,在國際權威刊物發表論文近百篇,研究成果多次被美國國家科學基金會以及多家媒體作為研究亮點報道。最近5年在重要的國際學術會議上做邀請報告20余次,并應邀訪問30余家國際知名的大學及研究機構。擔任包括自然,自然子刊,物理評論快報,先進材料,納米快報等40多種國際權威刊物的審稿人和美國、法國、德國、新加坡等國家科研基金的評審專家。




邀請人: 王倜 研究員


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