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Mattis, Daniel C. | Theory of glass dynamics: the low-lying modes of anharmonic materials | We study the lowest-lying excited states of arbitrary anharmonic solids (crystalline, glassy, or amorphous). Defining the harmonic ("skeleton") lattice underlying any such anharmonic medium, we find that its spectrum of elementary excitations provides a rigorous upper bound to that of the anharmonic... | Spectrum; Arbitrary; Lattices | 1987 |
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