What is moving in silica at 1 K? A computer study of the low-temperature anomalies

Details What is moving in silica at 1 K? A computer study of the low-temperature anomalies What is moving in silica at 1 K? A computer study of the low-temperature anomalies

2005-08-31

arxiv.org/abs/cond-mat/0508770v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevLett.95.155502

Though the existence of two-level systems (TLS) is widely accepted to explain low temperature anomalies in many physical observables, knowledge about their properties is very rare. For silica which is one of the prototype glass-forming systems we elucidate the properties of the TLS via computer simulations by applying a systematic search algorithm. We get specific information in the configuration space, i.e. about relevant energy scales, the absolute number of TLS and electric dipole moments. Furthermore important insight about the real-space realization of the TLS can be obtained. Comparison with experimental observations is included.

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