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Phonon hydrodynamics in crystalline GeTe at low temperature

hal.structure.identifierInstitut de Mécanique et d'Ingénierie [I2M]
dc.contributor.authorGHOSH, Kanka
hal.structure.identifierInstitut de Mécanique et d'Ingénierie [I2M]
dc.contributor.authorKUSIAK, Andrzej
IDREF: 084712899
hal.structure.identifierInstitut de Mécanique et d'Ingénierie [I2M]
dc.contributor.authorBATTAGLIA, Jean-Luc
IDREF: 084712562
dc.date.accessioned2021-05-14T09:30:26Z
dc.date.available2021-05-14T09:30:26Z
dc.date.issued2020-09
dc.identifier.issn2469-9950
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/75812
dc.description.abstractEnA first-principles density functional method along with the direct solution of linearized Boltzmann transport equations are employed to systematically analyze the low-temperature thermal transport in crystalline GeTe. The extensive thermal transport simulations, ranging from room temperature to cryogenic temperatures, reveal the emergence of a phonon hydrodynamic regime in GeTe at low temperature. The reduction of grain boundary scattering is found to play a crucial role along with the divergent trend of umklapp and normal scattering at low temperatures in accommodating the hydrodynamic regime. Average scattering rates for normal, umklapp, and other resistive processes are distinguished for a wide range (4–300 K) of temperatures and used for identifying various phonon transport regimes. Therefore, the variations of lattice thermal conductivity, phonon propagation length, and thermal diffusivity with temperature, related to these transport regimes (ballistic, hydrodynamic, and kinetic), have been thoroughly investigated. The modewise decomposition of lattice thermal conductivity and the distinction of thermal diffusivity according to different scattering processes reveal rich information on the dominant phonon modes and phonon scattering processes in GeTe at low temperature. Further, the kinetic-collective model is used to elucidate the hydrodynamic behavior of phonon scattering through the relative study of collective and kinetic contributions to the thermal transport properties. In this context, the Knudsen number is estimated through the characteristic nonlocal length and the grain size, which further quantifies the consistent hydrodynamic behavior of phonon thermal transport for GeTe. Finally, phonon-vacancy scattering for GeTe is realized, and vacancies are found strongly to influence the hydrodynamic window while incorporating the other resistive scattering mechanisms.
dc.language.isoen
dc.publisherAmerican Physical Society
dc.title.enPhonon hydrodynamics in crystalline GeTe at low temperature
dc.typeArticle de revue
dc.identifier.doi10.1103/PhysRevB.102.094311
dc.subject.halSciences de l'ingénieur [physics]
bordeaux.journalPhysical Review B
bordeaux.volume102
bordeaux.hal.laboratoriesInstitut de Mécanique et d’Ingénierie de Bordeaux (I2M) - UMR 5295*
bordeaux.issue9
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionBordeaux INP
bordeaux.institutionCNRS
bordeaux.institutionINRAE
bordeaux.institutionArts et Métiers
bordeaux.peerReviewedoui
hal.identifierhal-03167087
hal.version1
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-03167087v1
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