Interaction of longitudinal phonons with discrete breather in strained graphene

Iman Evazzade, Mahmood Rezaee Roknabadi (), Mohammad Behdani, Fatemeh Moosavi, Daxing Xiong, Kun Zhou and Sergey V. Dmitriev
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Iman Evazzade: Faculty of Science, Ferdowsi University of Mashhad
Mahmood Rezaee Roknabadi: Faculty of Science, Ferdowsi University of Mashhad
Mohammad Behdani: Faculty of Science, Ferdowsi University of Mashhad
Fatemeh Moosavi: Faculty of Science, Ferdowsi University of Mashhad
Daxing Xiong: Fuzhou University
Kun Zhou: School of Mechanical and Aerospace Engineering, Nanyang Technological University
Sergey V. Dmitriev: Institute for Metals Superplasticity Problems, Russian Academy of Sciences

The European Physical Journal B: Condensed Matter and Complex Systems, 2018, vol. 91, issue 7, 1-7

Abstract: Abstract We numerically analyze the interaction of small-amplitude phonon waves with standing gap discrete breather (DB) in strained graphene. To make the system support gap DB, strain is applied to create a gap in the phonon spectrum. We only focus on the in-plane phonons and DB, so the issue is investigated under a quasi-one-dimensional setup. It is found that, for the longitudinal sound waves having frequencies below 6 THz, DB is transparent and thus no radiation of energy from DB takes place; whereas for those sound waves with higher frequencies within the acoustic (optical) phonon band, phonon is mainly transmitted (reflected) by DB, and concomitantly, DB radiates its energy when interacting with phonons. The latter case is supported by the fact that, the sum of the transmitted and reflected phonon energy densities is noticeably higher than that of the incident wave. Our results here may provide insight into energy transport in graphene when the spatially localized nonlinear vibration modes are presented.

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1140/epjb/e2018-90055-3

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