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• W2077854655 endingPage "1660" @default.
• W2077854655 startingPage "1648" @default.
• W2077854655 abstract "A general formulation is given for studies of the vibrational properties of systems which have two-dimensional periodicity and one or two surfaces. Although layered structures and other systems with interfaces fall within the scope of this formulation, the principal motivation is to provide a framework for calculating and interpreting vibrational surface properties. No assumption is made concerning crystal structure, surface orientation, the interaction between particles, or the number of particles per unit cell. Also, the treatment is applicable to reconstructed surfaces, surfaces with adsorbed impurity particles, etc., as well as unreconstructed clean surfaces, provided that the two-dimensional periodicity is preserved. A discussion is given of the properties of the vibrational modes: In general, the displacement ellipse for a given mode can have any orientation. For surfaces with axial-inversion symmetry, however, one axis of the ellipse is always normal to the surface. If the surface has complete reflection symmetry with respect to a given plane, then for any two-dimensional wave vector parallel to the plane the modes will separate into two classes: one-third of the modes will be pure shear-horizontal (SH) modes, and the other two-thirds will be polarized strictly in the sagittal plane. It is possible for surface modes of one class to lie within the bulk subbands of the other class. If the crystal has either axial-inversion symmetry or a three-dimensional center of inversion, then the complex dynamical matrix can be reduced to a real, symmetric matrix of the same size. If both symmetries are present, as is the case for many surfaces of interest, then a further reduction is possible. Finally, notations are suggested for distinguishing two-dimensional vectors and for labeling symmetry points in the two-dimensional Brillouin zone associated with a surface." @default.
• W2077854655 created "2016-06-24" @default.
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• W2077854655 date "1971-09-15" @default.
• W2077854655 modified "2023-09-26" @default.
• W2077854655 title "Studies of Vibrational Surface Modes. I. General Formulation" @default.
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• W2077854655 doi "https://doi.org/10.1103/physrevb.4.1648" @default.
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