Energy landscape and rigidity
摘要
The effects of floppy modes in the thermodynamical properties of a system are studied. From thermodynamical arguments, we deduce that floppy modes are not at zero frequency and thus a modified Debye model is used to take into account this effect. The model predicts a deviation from the Debye law at low temperatures. Then, the connection between the topography of the energy landscape, the topology of the phase space and the rigidity of a glass is explored. As a result, we relate the number of constraints and floppy modes with the statistics of the landscape. We apply these ideas to a simple model for which we provide an approximate expression for the number of energy basins as a function of the rigidity. This allows to understand certains features of the glass transition, like the jump in the specific heat or the reversible window observed in chalcogenide glasses.
引用
@article{arxiv.cond-mat/0410484,
title = {Energy landscape and rigidity},
author = {Gerardo G. Naumis},
journal= {arXiv preprint arXiv:cond-mat/0410484},
year = {2015}
}
备注
1 text+3 eps figures