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Thermal rectification in mass-graded next-nearest-neighbor Fermi-Pasta-Ulam lattices

Abstract: We study the thermal rectification efficiency, i.e., quantification of asymmetric heat flow, of a one-dimensional mass-graded anharmonic oscillator Fermi-Pasta-Ulam lattice both with nearest-neighbor (NN) and next-nearestneighbor (NNN) interactions. The system presents a maximum rectification efficiency for a very precise value of the parameter that controls the coupling strength of the NNN interactions, which also optimizes the rectification figure when its dependence on mass asymmetry and temperature differences is considered. The origin of the enhanced rectification is the asymmetric local heat flow response as the heat reservoirs are swapped when a finely tuned NNN contribution is taken into account. A simple theoretical analysis gives an estimate of the optimal NNN coupling in excellent agreement with our simulation results.

 Fuente: Physical Review E 95, 032146 (2017)

Editorial: American Physical Society

 Fecha de publicación: 01/03/2017

Nº de páginas: 6

Tipo de publicación: Artículo de Revista

 DOI: 10.1103/PhysRevE.95.032146

ISSN: 1539-3755,1550-2376,2470-0045,2470-0053

Proyecto español: FIS2014-59462-P

Url de la publicación: https://doi.org/10.1103/PhysRevE.95.032146

Autores/as

ROMERO BASTIDA, MAURICIO

MIRANDA PEÑA, JORGE ORLANDO