Abstract-The effect of temperature, defect and strain rate on the mechanical property of multi-layer graphene: coarse-grained molecular dynamics study

Hui Li^a,Hong Zhang^{b, c,} ,Xinlu Cheng^{a, c}

• ^a Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
• ^b College of Physical Science and Technology, Sichuan University, China, Chengdu 610065,China
• ^c Key Laboratory of High Energy Density Physics and Technology of Ministry of Education, Sichuan University, Chengdu, 610064, China

http://www.sciencedirect.com/science/article/pii/S1386947716305173

In this work, we investigate the effect of temperature, defect, and strain rate on the mechanical properties of multi-layer graphene using coarse-grained molecular dynamics (CGMD) simulations. The simulation results reveal that the mechanical properties of multi-layer graphene tend to be less sensitive to temperature as the layer increases, but they are sensitive to the distribution and coverage of Stone-Wales (SW) defects. For the same number of defect, there is less decline in the fracture stress and Young's modulus of graphene when the defects have a regular distribution, in contrast to random distribution. In addition, Young's modulus is less influenced by temperature and defect, compared to fracture stress. Both the fracture stress and Young's modulus have little dependence on strain rate.

Abstract-Photon-drag-induced terahertz emission from graphene

Petr A. Obraztsov1,2,*, Natsuki Kanda3,4, Kuniaki Konishi5, Makoto Kuwata-Gonokami4,5,6, Sergey V. Garnov1, Alexander N. Obraztsov2,7, and Yuri P. Svirko2

• 1A. M. Prokhorov General Physics Institute, Moscow, Russia
• 2Department of Physics and Mathematics, University of Eastern Finland, Joensuu, Finland
• 3Laser Technology Laboratory, RIKEN, Saitama, Japan
• 4Photon Science Center, The University of Tokyo, Tokyo, Japan
• 5Institute for Photon Science and Technology, The University of Tokyo, Tokyo, Japan
• 6Department of Physics, The University of Tokyo, Tokyo, Japan
• 7Department of Physics, M. V. Lomonosov Moscow State University, Moscow, Russia

• *p.obraztsov@gmail.com
• https://journals.aps.org/prb/abstract/10.1103/PhysRevB.90.241416

We report the investigation of a strong interband photon drag effect in multilayer graphene leading to efficient emission of terahertz radiation. The obtained terahertz photoresponse of graphene layers exhibits peculiarities fundamentally predicted for free carrier transport in two-dimensional electronic systems. Owing to significant light absorption in gapless graphene, where each absorbed photon produces an electron-hole pair with the highest possible kinetic energy, the photon drag mechanism provides a possibility to achieve efficient conversion of light into broadband terahertz radiation as well as new ways towards vectorial control of the generated terahertz radiation in graphene-based materials.

DOI: http://dx.doi.org/10.1103/PhysRevB.90.241416

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• Published 29 December 2014
• Received 9 October 2014

©2014 American Physical Society