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Optical Rotation of Linearly Polarized Light Propagating through a nonideal 1D-Superlattice

Materials Sciences and Applications 2010年第1期1卷 32-35页

作者： Vladimir V. Rumyantsev Stanislav A. Fedorov 不详

The problem of finding polariton modes (necessary for calculating gyrotropic characteristics) in space-dispersed superlattices is not yet solved. At the same time the specified quantities can be approximately evaluated if the widths of layers comprising a multilayer material are much bigger then the characteristic scales of space dispersion. In such a case the contribution of individual layers to gyrotropy can be regarded as independed. Thus the corresponding optical quantities can be expressed through the layers' gyrotropic characteristics. This approach is applied to calculate the specific rotation angle of plane of polarization of light propagating through a nonideal 1D-superlattice, which varies in composition as well as in layers' width.

关键词： Light Propagation nonideal 1D-Superlattice Specific Rotation Angle

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Crystalline order and disorder in dusty plasmas investigated by nonequilibrium molecular dynamics simulations

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Chinese Physics B 2019年第5期28卷 181-188页

作者： Aamir Shahzad Maogang He Sheeba Ghani Muhammad Kashif Tariq Munir Fang Yang Molecular Modeling and Simulation Laboratory Department of Physics Government College University Faisalabad (GCUF) Key Laboratory of Thermo-Fluid Science and Engineering of Ministry of Education Xi’an Jiaotong University Department of Physics University of Engineering and Technology (UET) Lahore College of Physics Civil Aviation University of China

The particle structure of a complex system has been explored through a unique Evans' s homogenous nonequilibrium molecular dynamics(HNEMD) simulation technique. The crystalline order–disorder structures(OD-structures) and the corresponding energies of three-dimensional(3 D) nonideal complex systems(NICSs) have been measured over a wide range of plasma states(■, κ) for a body-centered cubic(BCC) structure. The projected technique provides accurate ODstructures with fast convergence and applicable to very small size effect for different temperatures(≡ 1/■) and constant force field(F~*) values. The OD-structure obtained through HNEMD approach is found to be reasonable agreement and more reliable than those earlier identified by simulation approaches and experimental data of NICSs. New simulations of OD-structures show that dusty plasma remains in crystalline(strongly coupled) state at lower temperature and constant F*values, for the whole simulation runs. Our investigations show that the crystalline structure is changed and the particle structure switches from intermediate to disorder(nonideal gaseous) state with an increase of the system's temperature. It has been shown that the long range order shifts toward lower temperature with increasing κ. The presented technique exhibits that the potential energy has a maximum value when the dusty plasma remains in crystalline states(low temperatures),which confirms earlier 3 D simulation results.

关键词： nonequilibrium molecular dynamics crystalline structures nonideal complex systems dusty plasmas strongly coupled regime

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