Nelinearna dinamika u okviru Frenkel-Kontorova modela pod dejstvom spoljašnjih periodičnih sila

Abstract

Ispitivan je generalisani Frenkel-Kontorova model pod dejstvom spoljašnjih periodičnih sila, i njihov uticaj na Šapiro stepenike. Deformacija substratnog potencijala prouzrokuje pojavu velikih polucelih i drugih subharmonijskih stepenika u sistemu. Rezultati dobijeni u radu su od značaja u talasima i spinovima gustine naboja kao i u Džozefsonovim spojevima.

Properties of the Shapiro steps in dierent commensurate structures of the ac + dc driven Frenkel-Kontorova model with dierent generalized substrate potential have been examined. Deviation from the sinusoidal potential produces appearance of large subharmonic steps. Presented results could be of great importance for thestudies of all real systems closely related to the dissipative dynamics of the FK model such as studies of the charge- or spin-density wave systems and the systems of Josephson-junction arrays.