Results 31 to 40 of about 11,578,760 (276)
A phase-field-crystal model for liquid crystals [PDF]
Journal of Physics: Condensed Matter, 2010 Based on static and dynamical density functional theory, a phase-field-crystal model is derived which involves both the translational density and the orientational degree of ordering as well as a local director field. The model exhibits stable isotropic, nematic, smectic A, columnar, plastic crystalline and orientationally ordered crystalline phases ...
openaire +3 more sources
Phase Field Theory of Heterogeneous Crystal Nucleation [PDF]
Physical Review Letters, 2007 A phase eld approach is developed to model wetting and heterogeneous crystal nucleation of an undercooled pure liquid in contact with a sharp wall. We discuss various choices for the boundary condition at the wall and determine the properties of critical nuclei, including their free energy of formation and the contact angle as a function of ...
Gránásy, László +3 more
openaire +4 more sources
Scientific Reports, 2023 The highly-nonlinear chalcopyrite crystal family has experienced remarkable success as source crystals in the mid-infrared spectral range, such that these crystals are primary candidates for producing high terahertz frequency (i.e., $$\gtrsim$$ ≳ 10 THz)
B. N. Carnio +5 more
doaj +1 more source
Molecules, 2021 In this paper, a simple and powerful method to control the induced handedness of helical nanofilaments (HNFs) is presented. The nanofilaments are formed by achiral bent-core liquid crystal molecules employing a cholesteric liquid crystal field obtained ...
Ju-Yong Kim +4 more
doaj +1 more source
A phase-field-crystal approach to critical nuclei [PDF]
Journal of Physics: Condensed Matter, 2010 We investigate a phase-field-crystal model for homogeneous nucleation. Instead of solving the time evolution of a density field towards equilibrium we use a String Method to identify saddle points in phase space. The saddle points allow to obtain the nucleation barrier and the critical nucleus.
Backofen, Rainer, Voigt, Axel
openaire +3 more sources
Consistent Hydrodynamics for Phase Field Crystals
Physical Review Letters, 2016 We use the amplitude expansion in the phase field crystal framework to formulate an approach where the fields describing the microscopic structure of the material are coupled to a hydrodynamic velocity field. The model is shown to reduce to the well known macroscopic theories in appropriate limits, including compressible Navier-Stokes and wave ...
Heinonen, V. +6 more
openaire +8 more sources
Noise-Induced Defects in Honeycomb Lattice Structure: A Phase-Field Crystal Study
Crystals, 2023 One of the classes of the kinetic phase-field model in the form of the two-mode hyperbolic phase-field crystal model (modified PFC model) is used for the study of the noise effect of the crystalline structure.
Vladimir Ankudinov, Peter K. Galenko
doaj +1 more source
Stability of liquid crystalline phases in the phase-field-crystal model [PDF]
Physical Review E, 2011 The phase-field-crystal model for liquid crystals is solved numerically in two spatial dimensions. This model is formulated with three position-dependent order parameters, namely the reduced translational density, the local nematic order parameter, and the mean local direction of the orientations.
Cristian Vasile Achim +2 more
openaire +4 more sources
Thermal fluctuations and phase diagrams of the phase-field crystal model with pinning [PDF]
Physical Review E, 2008 8 pages, 9 figures, to appear in Phys.
Ramos, J.A.P. +5 more
openaire +4 more sources
Microscopic patterns in the 2D phase-field-crystal model
Nonlinearity, 2022 Abstract Using the recently developed theory of rigorously validated numerics, we address the phase-field-crystal model at the microscopic (atomistic) level. We show the existence of critical points and local minimizers associated with ‘classical’ candidates, grain boundaries, and localized patterns.
Gabriel Martine-La Boissonière +2 more
openaire +4 more sources