Novel low-temperature behavior in classical many-particle systems

Robert D. Batten, Frank H. Stillinger, Salvatore Torquato

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


We show that classical many-particle systems interacting with certain soft pair interactions in two dimensions exhibit novel low-temperature behaviors. Ground states span from disordered to crystalline. At some densities, a large fraction of normal-mode frequencies vanish. Lattice ground-state configurations have more vanishing frequencies than disordered ground states at the same density and exhibit vanishing shear moduli. For the melting transition from a crystal, the thermal expansion coefficient is negative. These unusual results are attributed to the topography of the energy landscape.

Original languageEnglish (US)
Article number050602
JournalPhysical review letters
Issue number5
StatePublished - Aug 6 2009

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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