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Título:
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The Boson peak and the phonons in glasses
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Autores:
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Ciliberti, S. ;
Grigera, T.S. ;
Martín Mayor, Víctor ;
Parisi, G. ;
Verrocchio, P.
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Tipo de documento:
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texto impreso
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Editorial:
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American Institute of Physics, 2004-06
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Física-Modelos matemáticos
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Tipo = Artículo
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Resumen:
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Despite the presence of topological disorder, phonons seem to exist also in glasses at very high frequencies (THz) and they remarkably persist into the supercooled liquid. A universal feature of such a systems is the Boson peak, an excess of states over the standard Debye contribution at the vibrational density of states. Exploiting the euclidean random matrix theory of vibrations in amorphous systems, we show that this peak is the signature of a phase transition in the space of the stationary points of the energy, from a minima-dominated phase (with phonons) at low energy to a saddle-point dominated phase (without phonons). The theoretical predictions are checked by means of numeric simulations.
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En línea:
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https://eprints.ucm.es/46428/1/Mart%C3%ADnMayorV%20LIBRE%2018.pdf
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