Unlocking mechanism in the ac dynamics of the Frenkel-Kontorova model
- Instituto de Ciencia de Materiales de Aragon, Consejo Superior de Investigaciones Cientificas, Universidad de Zaragoza, 50009 Zaragoza (Spain)
The dissipative dynamics of commensurate structures of the one-dimensional Frenkel-Kontorova model submitted to dc and ac forces is studied. The average velocity varies with the average external force as a staircase (dynamical mode locking). We characterize the unlocking transition as a transition from temporal periodicity to quasiperiodicity by using standard tools of the theory of dynamical systems. This transition is phenomenologically described as the generation of coherent, time-localized, and regularly-distributed increases of the particle velocities (instantons), which carry out a topological charge, the origin of which is the discrete character of the symmetry group of transformations of the locked steady state.
- OSTI ID:
- 6023376
- Journal Information:
- Physical Review, B: Condensed Matter; (United States), Vol. 48:10; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
Similar Records
Lattice vibrations in the Frenkel-Kontorova model. I. Phonon dispersion, number density, and energy
Twist map, the extended Frenkel-Kontorova model and the devil's staircase
Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CRYSTAL MODELS
DYNAMICS
COMPUTERIZED SIMULATION
INSTANTONS
JOSEPHSON JUNCTIONS
ONE-DIMENSIONAL CALCULATIONS
TYPE-II SUPERCONDUCTORS
JUNCTIONS
MATHEMATICAL MODELS
MECHANICS
QUASI PARTICLES
SIMULATION
SUPERCONDUCTING JUNCTIONS
SUPERCONDUCTORS
665000* - Physics of Condensed Matter- (1992-)