학술논문
Visualizing moir\'e ferroelectricity via plasmons and nano-photocurrent in graphene/twisted-WSe2 structures
Document Type
Working Paper
Author
Zhang, Shuai; Liu, Yang; Sun, Zhiyuan; Chen, Xinzhong; Li, Baichang; Moore, S. L.; Liu, Song; Wang, Zhiying; Rossi, S. E.; Jing, Ran; Fonseca, Jordan; Yang, Birui; Shao, Yinming; Huang, Chun-Ying; Handa, Taketo; Xiong, Lin; Fu, Matthew; Pan, Tsai-Chun; Halbertal, Dorri; Xu, Xinyi; Zheng, Wenjun; Schuck, P. J.; Pasupathy, A. N.; Dean, C. R.; Zhu, Xiaoyang; Cobden, David H.; Xu, Xiaodong; Liu, Mengkun; Fogler, M. M.; Hone, James C.; Basov, D. N.
Source
Nature Communications 14, 6200 (2023)
Subject
Language
Abstract
Ferroelectricity, a spontaneous and reversible electric polarization, is found in certain classes of van der Waals (vdW) material heterostructures. The discovery of ferroelectricity in twisted vdW layers provides new opportunities to engineer spatially dependent electric and optical properties associated with the configuration of moir\'e superlattice domains and the network of domain walls. Here, we employ near-field infrared nano-imaging and nano-photocurrent measurements to study ferroelectricity in minimally twisted WSe2. The ferroelectric domains are visualized through the imaging of the plasmonic response in a graphene monolayer adjacent to the moir\'e WSe2 bilayers. Specifically, we find that the ferroelectric polarization in moir\'e domains is imprinted on the plasmonic response of the graphene. Complementary nano-photocurrent measurements demonstrate that the optoelectronic properties of graphene are also modulated by the proximal ferroelectric domains. Our approach represents an alternative strategy for studying moir\'e ferroelectricity at native length scales and opens promising prospects for (opto)electronic devices.
Comment: 19 pages, 3 figures
Comment: 19 pages, 3 figures