Impact of the regularization parameter in the mean free path reconstruction method : Nanoscale heat transport and beyond
Sanchez Martinez, Miguel Ángel (Institut Català de Nanociència i Nanotecnologia)
Alzina, Francesc (Institut Català de Nanociència i Nanotecnologia)
Oyarzo, Juan (Pontificia Universidad Católica de Valparaíso. Instituto de Química)
Sotomayor Torres, Clivia M. (Institut Català de Nanociència i Nanotecnologia)
Chávez Ángel, Emigdio (Institut Català de Nanociència i Nanotecnologia)

Date:	2019
Abstract:	The understanding of the mean free path (MFP) distribution of the energy carriers in materials (e. g. , electrons, phonons, magnons, etc. ) provides a key physical insight into their transport properties. In this context, MFP spectroscopy has become an important tool to describe the contribution of carriers with different MFP to the total transport phenomenon. In this work, we revise the MFP reconstruction technique and present a study on the impact of the regularization parameter on the MFP distribution of the energy carriers. By using the L-curve criterion, we calculate the optimal mathematical value of the regularization parameter. The effect of the change from the optimal value in the MFP distribution is analyzed in three case studies of heat transport by phonons. These results demonstrate that the choice of the regularization parameter has a large impact on the physical information obtained from the reconstructed accumulation function, and thus cannot be chosen arbitrarily. The approach can be applied to various transport phenomena at the nanoscale involving carriers of different physical nature and behavior.
Grants:	European Commission 604668 Ministerio de Economía y Competitividad FIS2015-70862-P Ministerio de Economía y Competitividad BES2015-075920 Ministerio de Economía y Competitividad SEV-2017-0706
Note:	Altres ajuts: CERCA Programme/Generalitat de Catalunya
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Mean free path reconstruction ; Mean free path distribution of phonons ; Thermal conductivity distribution
Published in:	Nanomaterials, Vol. 9, Issue 3 (March 2019) , art. 414, ISSN 2079-4991

DOI: 10.3390/nano9030414
PMID: 30862077

10 p, 2.0 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Catalan Institute of Nanoscience and Nanotechnology (ICN2)
Articles > Research articles
Articles > Published articles