Journal
PHYSICS LETTERS A
Volume 377, Issue 9, Pages 721-726Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.physleta.2013.01.013
Keywords
Graphene; Phonon transport; Energy inversion; Localized phonon excitation; Static heat source
Categories
Funding
- National Science Foundation [CBET-0931290, CMMI-1029072, CBET-0932573, CMMI-0926704]
- National Science Foundation of China [51176106]
- Eastern Scholar Program of Shanghai, China
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0931290] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0932573] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0926704] Funding Source: National Science Foundation
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This work reports on the phonon energy inversion in graphene nanoribbons: after initial localized thermal excitation, the energy of initial cold phonons (flexural mode: FM) becomes higher than that of local hot phonons (longitudinal and transverse modes: LM/TM). Such energy inversion holds for about 50 picoseconds. Two physical factors combine together to give rise of this phenomenon: one is the much faster heat conduction by FM phonons than that by LM/TM phonons, and the other factor is the strongly temperature-dependent energy exchange rate between FM and LM/TM phonons: 3.7 x 10(10) s(-1) at 84 K to 20.3 x 10(10) s(-1) at around 510 K. (c) 2013 Elsevier B.V. All rights reserved.
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