周蔚，九江学院理学院，教授，俄亥俄州立大学物理学博士，主持或参与国家级省级厅级等项目多项，在权威核心期刊《Advanced Materials》等SCI杂志上以第一作者或通讯身份发表学术论文10余篇。

报告题目：《激光光谱学和光电流研究》； 时间：2023年6月14日 16：00；地点：文友楼312室。

报告摘要：

    We propose to investigate the photoresponse of anisotropic two dimensional (2D) materials by using laser spectroscopy and low energy and linearly polarized lights. We will first mechanically exfoliate anisotropic two 2D material flakes and characterize their anisotropic crystallinity by laser spectroscopy including Raman, reflection and photoluminescence. We then observe novel phenomena such as WTe2 anomalous negative photocurrents under three steady-state light irradiations: visible (514.5 nm), mid and far infrared (3.8 and 10.6 μm) lasers at room temperature. Our work will explore that linearly polarized light irradiation is an effective approach to tune anisotropic flake surface electronic structure and may induces large anomalous anisotropic photocurrents. Furthermore, the resultant large and anisotropic photoresponse demonstrates an advantage in designing infrared light detectors even at room temperature.