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[期刊论文]

Crossover between different universality classes: Scaling for thermal transport in one dimension

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author:

Xiong, Daxing (Xiong, Daxing.) [1]

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Scopus SCIE

Abstract:

For thermal transport in one-dimensional (1D) systems, recent studies have suggested that employing different theoretical models and different numerical simulations under different system's parameter regimes might lead to different universality classes of the scaling exponents. In order to well understand the universality class(es), here we perform a direct dynamics simulation for two archetype 1D oscillator systems with quite different phonon dispersions under various system's parameters and find that there is a crossover between the different universality classes. We show that by varying anharmonicity and temperatures, the space-time scaling exponents for the systems with different dispersions can be feasibly tuned in different ways. The underlying picture is suggested to be understood by phonons performing various kinds of continuous-time random walks (in most cases, be the Levy walks but not always), probably induced by the peculiar phonon dispersions along with nonlinearity. The results and suggested mechanisms may provide insights into controlling the transport of heat in some 1D materials. Copyright (C) EPLA, 2016

Community:

  • [ 1 ] [Xiong, Daxing]Fuzhou Univ, Dept Phys, Fuzhou 350108, Fujian, Peoples R China

Reprint 's Address:

  • 熊大兴

    [Xiong, Daxing]Fuzhou Univ, Dept Phys, Fuzhou 350108, Fujian, Peoples R China

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Source :

EPL

ISSN: 0295-5075

Year: 2016

Issue: 1

Volume: 113

1 . 9 5 7

JCR@2016

1 . 8 0 0

JCR@2023

ESI Discipline: PHYSICS;

ESI HC Threshold:186

JCR Journal Grade:2

CAS Journal Grade:2

Cited Count:

WoS CC Cited Count: 18

SCOPUS Cited Count: 18

30 Days PV: 0

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