INVESTIGADORES
PASTAWSKI Horacio Miguel
artículos
Título:
Dynamical phase transition in vibrational surface modes
Autor/es:
HERNAN L. CALVO; HORACIO M. PASTAWSKI
Revista:
BRAZILIAN JOURNAL OF PHYSICS
Editorial:
Sociedad Brasileira de Física
Referencias:
Año: 2006 vol. 36 p. 963 - 967
ISSN:
0103-9733
Resumen:
Dynamical Phase Transition in Vibrational Surface Modes,H. L. Calvo and H. M. Pastawski, Brazilian Journal of Physics, vol. 36, no. 3B, September, 2006 963 963 Dynamical Phase Transition in Vibrational Surface Modes,H. L. Calvo and H. M. Pastawski, Brazilian Journal of Physics, vol. 36, no. 3B, September, 2006 963 963 We consider the dynamical properties of a simple model of vibrational surface modes. We obtain the exact spectrum of surface excitations and discuss their dynamical features. In addition to the usually discussed localized and oscillatory regimes we also find a second phase transition where surface mode frequency becomes purely imaginary and describes an overdamped regime. Noticeably, this transition has an exact correspondence to the oscillatory - overdamped transition of the standard oscillator with a frictional force proportional to velocity.
