Long-wavelength properties of phase-field-crystal models with second-order dynamics

Tutkimustuotos: LehtiartikkeliArticleScientificvertaisarvioitu

5 Sitaatiot (Scopus)
153 Lataukset (Pure)

Abstrakti

The phase-field-crystal (PFC) approach extends the notion of phase-field models by describing the topology of the microscopic structure of a crystalline material. One of the consequences is that local variation of the interatomic distance creates an elastic excitation. The dynamics of these excitations poses a challenge: pure diffusive dynamics cannot describe relaxation of elastic stresses that happen through phonon emission. To this end, several different models with fast dynamics have been proposed. In this article we use the amplitude expansion of the PFC model to compare the recently proposed hydrodynamic PFC amplitude model with two simpler models with fast dynamics. We compare these different models analytically and numerically. The results suggest that in order to have proper relaxation of elastic excitations, the full hydrodynamical description of the PFC amplitudes is required.

AlkuperäiskieliEnglanti
Artikkeli053002
Sivut1-9
JulkaisuPhysical Review E
Vuosikerta93
Numero5
DOI - pysyväislinkit
TilaJulkaistu - 9 toukokuuta 2016
OKM-julkaisutyyppiA1 Julkaistu artikkeli, soviteltu

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