Computer investigation of the energy landscape of amorphous silica

Details Computer investigation of the energy landscape of amorphous silica Computer investigation of the energy landscape of amorphous silica

1999-07-29

arxiv.org/abs/cond-mat/9907455v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

5 pages; accepted for publication in PRL

Scientific paper

10.1103/PhysRevLett.83.2210

The multidimensional topography of the collective potential energy function of a so-called strong glass former (silica) is analyzed by means of classical molecular dynamics calculations. Features qualitatively similar to those of fragile glasses are recovered at high temperatures : in particular an intrinsic characteristic temperature $T_c\simeq 3500$K is evidenced above which the system starts to investigate non-harmonic potential energy basins. It is shown that the anharmonicities are essentially characterized by a roughness appearing in the potential energy valleys explored by the system for temperatures above $T_c$.

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