Splashing transients of 2D plasmons launched by swift electrons

Lin, Xiao and Kaminer, Ido and Shi, Xihang and Gao, Fei and Yang, Zhaoju and Gao, Zhen and Buljan, Hrvoje and Joannopoulos, John D. and Soljačić, Marin and Chen, Hongsheng and Zhang, Baile (2017) Splashing transients of 2D plasmons launched by swift electrons. Science Advances, 3 (1). e1601192-6. ISSN 2375-2548

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Abstract

Launching of plasmons by swift electrons has long been used in electron energy–loss spectroscopy (EELS) to investigate the plasmonic properties of ultrathin, or two-dimensional (2D), electron systems. However, the question of how a swift electron generates plasmons in space and time has never been answered. We address this issue by calculating and demonstrating the spatial-temporal dynamics of 2D plasmon generation in graphene. We predict a jet-like rise of excessive charge concentration that delays the generation of 2D plasmons in EELS, exhibiting an analog to the hydrodynamic Rayleigh jet in a splashing phenomenon before the launching of ripples. The photon radiation, analogous to the splashing sound, accompanies the plasmon emission and can be understood as being shaken off by the Rayleigh jet–like charge concentration. Considering this newly revealed process, we argue that previous estimates on the yields of graphene plasmons in EELS need to be reevaluated.

Item Type: Article
Keywords: 2D plasmons, transition radiation, EELS, Reyleigh jet, splashing, formation zone, formation time, graphene
Date: 2017
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright © 2017, The Authors. This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license, which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited. This work was sponsored by the National Natural Science Foundation of China (grant nos. 61625502, 61574127, 61601408, and 61550110245), the Zhejiang Natural Science Foundation (grant no. LY17F010008), the Postdoctoral Science Foundation of China (grant no. 2015M581930), the Top-Notch Young Talents Program of China, the Innovation Joint Research Center for Cyber-Physical-Society System, the Nanyang Technological University for Nanyang Assistant Professorship Start-Up Grant, the Singapore Ministry of Education (grant nos. MOE2015-T2-1-070 and MOE2011-T3-1-005), the U.S. Army Research Laboratory and the U.S. Army Research Office through the Institute for Soldier Nanotechnologies (contract no. W911NF-13-D-0001), the Massachusetts Institute of Technology S3TEC Energy Frontier Research Center of the Department of Energy (grant no. de-sc0001299), the QuantiXLie Center of Excellence, and the Chinese Scholarship Council (CSC 201506320075).
Divisions: Faculty of Science > Department of Physics
Publisher: American Association for the Advancement of Science
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 13 Nov 2017 20:58
Last Modified: 13 Nov 2017 20:58
URI: http://digre.pmf.unizg.hr/id/eprint/5695

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