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Title: Effects of Aperiodicity and Roughness on Coherent Heat Conduction in Superlattices

Abstract

Coherent phonon heat conduction has recently been confirmed experimentally in superlattice structures. Such traveling coherent phonon waves in superlattices lead to a linear increase in thermal conductivity as the number of periods increases. For applications such as thermal insulation or thermoelectrics, minimization of the phonon coherent effect is desirable. In this paper, we use molecular dynamics simulations to study how to control coherent heat conduction in superlattices (SLs). It is found that either aperiodic SLs or SLs with rough interfaces can significantly disrupt coherent heat conduction when the interface densities are high. For sample thickness less than 125 nm, aperiodic SLs with perfect interfaces are found to have the lowest thermal conductivity. We use the atomic Green’s function method to examine the phonon dynamics. The impact of either aperiodicity or interface roughness is attributed to reduced transmittance. Such impact diminishes as the interface density reduces.

Authors:
 [1];  [1];  [2]
  1. Massachusetts Inst. of Technology, Cambridge, MA (United States). Dept. of Mechanical Engineering
  2. Virginia Tech, Blacksburg, VA (United States). Dept. of Mechanical Engineering
Publication Date:
Research Org.:
Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1370984
Grant/Contract Number:  
SC0001299; FG02-09ER46577
Resource Type:
Accepted Manuscript
Journal Name:
Nanoscale and Microscale Thermophysical Engineering
Additional Journal Information:
Journal Volume: 19; Journal Issue: 4; Related Information: S3TEC partners with Massachusetts Institute of Technology (lead); Boston College; Oak Ridge National Laboratory; Rensselaer Polytechnic Institute; Journal ID: ISSN 1556-7265
Publisher:
Taylor & Francis
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; solar (photovoltaic); solar (thermal); solid state lighting; phonons; thermal conductivity; thermoelectric; defects; mechanical behavior; charge transport; spin dynamics; materials and chemistry by design; optics; synthesis (novel materials); synthesis (self-assembly); synthesis (scalable processing); superlattice; molecular dynamics; atomic green's function

Citation Formats

Qiu, Bo, Chen, Gang, and Tian, Zhiting. Effects of Aperiodicity and Roughness on Coherent Heat Conduction in Superlattices. United States: N. p., 2015. Web. https://doi.org/10.1080/15567265.2015.1102186.
Qiu, Bo, Chen, Gang, & Tian, Zhiting. Effects of Aperiodicity and Roughness on Coherent Heat Conduction in Superlattices. United States. https://doi.org/10.1080/15567265.2015.1102186
Qiu, Bo, Chen, Gang, and Tian, Zhiting. Tue . "Effects of Aperiodicity and Roughness on Coherent Heat Conduction in Superlattices". United States. https://doi.org/10.1080/15567265.2015.1102186. https://www.osti.gov/servlets/purl/1370984.
@article{osti_1370984,
title = {Effects of Aperiodicity and Roughness on Coherent Heat Conduction in Superlattices},
author = {Qiu, Bo and Chen, Gang and Tian, Zhiting},
abstractNote = {Coherent phonon heat conduction has recently been confirmed experimentally in superlattice structures. Such traveling coherent phonon waves in superlattices lead to a linear increase in thermal conductivity as the number of periods increases. For applications such as thermal insulation or thermoelectrics, minimization of the phonon coherent effect is desirable. In this paper, we use molecular dynamics simulations to study how to control coherent heat conduction in superlattices (SLs). It is found that either aperiodic SLs or SLs with rough interfaces can significantly disrupt coherent heat conduction when the interface densities are high. For sample thickness less than 125 nm, aperiodic SLs with perfect interfaces are found to have the lowest thermal conductivity. We use the atomic Green’s function method to examine the phonon dynamics. The impact of either aperiodicity or interface roughness is attributed to reduced transmittance. Such impact diminishes as the interface density reduces.},
doi = {10.1080/15567265.2015.1102186},
journal = {Nanoscale and Microscale Thermophysical Engineering},
number = 4,
volume = 19,
place = {United States},
year = {2015},
month = {12}
}

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Cited by: 23 works
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