Young-Chul Leem, Zhenyao Fang, Yun-Kyung Lee, Na-Yeong Kim, Arvin Kakekhani, Wenjing Liu, Sung-Pyo Cho, Cheolsu Kim, Yuhui Wang, Zhurun Ji, Abhirup Patra, Leeor Kronik, Andrew M Rappe, Sang-Youp Yim, Ritesh Agarwal
The ultrahigh surface area of two-dimensional materials can drive multimodal coupling between optical, electrical, and mechanical properties that leads to emergent dynamical responses not possible in three-dimensional systems. We observed that optical excitation of the WS2 monolayer above the exciton energy creates symmetrically patterned mechanical protrusions which can be controlled by laser intensity and wavelength. This observed photostrictive behavior is attributed to lattice expansion due to the formation of polarons, which are charge carriers dressed by lattice vibrations...
April 24, 2024: Nano Letters