北京大学量子材料科学中心学术报告视频--Sufei Shi

题目： Revealing the Excitonic Complexes in BNEncapsulated Monolayer WSe2

报告人：Sufei Shi

单位：Rensselaer Polytechnic Institute

报告地点：北京大学物理楼

扫码观看本次报告视频

报告摘要

Single layer transition metal dichalcogenides (TMDs) represent a new class of atomically thin semiconductors with superior optical and optoelectronic properties. The two-dimensional nature of single-layer TMDs results in reduced screening and enhanced Coulomb interaction, giving rise to excitonic complexes such as exciton, trion, and biexciton with binding energy orders of magnitude larger than that of conventional semiconductors such as GaAs. The excitonic complexes also possess valley degree of freedom and can be accessed selectively through circularly polarized light. Here we show that by encapsulating the monolayer WSe2 with BN, we can construct devices with high-quality optical spectra which helps to identify fine features of excitonic complexes. The BN encapsulated monolayer WSe2 thus provides an exciting playground for the strong light-matter interaction in 2D.

个人简介

Sufei Shi is currently an Assiatant Professor in the Chemical and Biological Engineering Department of Rensselaer Polytechnic Institute（RPI）. His group is focused on the optoelectronics study of two-dimensional（2D）materials and related van der waals（vdw）heterostructures. He worked with Prof. Dan Ralph at Cornell Univ. And obtained Ph. D. in Physics in 2012, working on nanoscale electrical transport and photocurrent study at low temperature. He then did his postdoc research with Prof.Feng Wang at UC Berkeley, with a focus on ultrafast and broadband optical spectroscopy. He joined RPI since 2015 and is leading an ultrafast nanoscale optoelectronics group studying devices made of 2D vdw heterostructures. He also holds a joint position with the Electrical, computer and Systems Engineering Department at RPI.

往期点击排行榜

END

为满足更多科研工作者的需求，蔻享学术陆续开通了关于物理，化学，天文，材料，工程，管理等领域的微信交流群。如有需要请先添加微信号AugsburgSui 或长按下方二维码，备注信息请标明研究方向或科研领域，通过审核之后我们将您拉入相应科研领域微信交流群。

扫码添加

更多精彩视频登陆网站

https://www.am-stc.com/

未经书面许可，禁止转载本页内容

转载授权请联系：

[e-mail]