光电流
光电探测器
光电效应
材料科学
光电子学
Weyl半金属
圆极化
极化(电化学)
Berry连接和曲率
反常光电效应
凝聚态物理
光学
半金属
光伏系统
物理
化学
带隙
物理化学
电介质
微带线
几何相位
生物
铁电性
生态学
作者
Albert Mathew,Vijith K. Pulikodan,Manoj A. G. Namboothiry
摘要
Topological effects in a Weyl semimetal are explored in developing self-powered photodetectors at room temperature. The observed photocurrent is attributed to a combined effect of photothermoelectric effect and bulk photovoltaic phenomenon and is found to be a non-linear optical effect that converts light into electrical current. The self-powered photoresponse at 640 nm excitation wavelength reveals the presence of a diverging Berry curvature of tungsten ditelluride (Td-WTe2) at room temperature. The different perspective of polarization dependent photocurrent spectroscopy is used to separate the photothermal current from the shift current and the circular photo galvanic response from the linear photo galvanic response.
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