Dynamical Evolution of Anisotropic Response in Black Phosphorus under Ultrafast Photoexcitation

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• 作者：Shaofeng Ge ; Chaokai Li ; Zhiming Zhang ; Chenglong Zhang ; Yudao Zhang ; Jun Qiu ; Qinsheng Wang ; Junku Liu ; Shuang Jia ; Ji Feng ; Dong Sun
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：July 8, 2015
• 年：2015
• 卷：15
• 期：7
• 页码：4650-4656
• 全文大小：453K
• ISSN：1530-6992

文摘

Black phosphorus has recently emerged as a promising material for high-performance electronic and optoelectronic device for its high mobility, tunable mid-infrared bandgap, and anisotropic electronic properties. Dynamical evolution of photoexcited carriers and the induced transient change of electronic properties are critical for materials鈥?high-field performance but remain to be explored for black phosphorus. In this work, we perform angle-resolved transient reflection spectroscopy to study the dynamical evolution of anisotropic properties of black phosphorus under photoexcitation. We find that the anisotropy of reflectivity is enhanced in the pump-induced quasi-equilibrium state, suggesting an extraordinary enhancement of the anisotropy in dynamical conductivity in hot carrier dominated regime. These results raise attractive possibilities of creating high-field, angle-sensitive electronic, optoelectronic, and remote sensing devices exploiting the dynamical electronic anisotropy with black phosphorus.