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Mostrando ítems 31-40 de 52
Artículo
Nonequivalence of phonon modes in the sine-Gordon equation
(2001)
We study the resonances in the sine-Gordon equation driven by an ac force using a linear perturbation theory. We show that resonances take place when the driving frequency d is equal to half of the phonon modes’ frequencies ...
Artículo
Exact stationary solutions of the parametrically driven and damped nonlinear Dirac equation
(AIP Publishing, 2019)
Two exact stationary soliton solutions are found in the parametrically driven and damped nonlinear Dirac equation. The parametric force considered is a complex ac force. The solutions appear when their frequencies are ...
Artículo
Internal Mode Mechanism for Collective Energy Transport in Extended Systems
(2003)
We study directed energy transport in homogeneous nonlinear extended systems in the presence of homogeneous ac forces and dissipation. We show that the mechanism responsible for unidirectional motion of topological excitations ...
Artículo
Kink ratchet induced by a time-dependent symmetric field potential
(American Physical Society, 2016)
The ratchet effect of a sine-Gordon kink is investigated in the absence of any external force while the symmetry of the field potential at every time instant is maintained. The directed motion appears by a time shift of ...
Artículo
Soliton ratchets in homogeneous nonlinear Klein-Gordon systems
(2006)
We study in detail the ratchetlike dynamics of topological solitons in homogeneous nonlinear Klein-Gordon systems driven by a biharmonic force. By using a collective coordinate approach with two degrees of freedom, namely ...
Artículo
A linear polar molecule in a two-color cw laser field: a symmetry analysis
(American Physical Society, 2020-08)
A theoretical study of the rotational dynamics of a linear polar molecule in a two-color nonresonant cw laser field is presented. By systematically considering the interactions of this field with the electric dipole moment, ...
Artículo
Nonsinusoidal current and current reversals in a gating ratchet
(American Physical Society, 2015)
In this work, the ratchet dynamics of Brownian particles driven by an external sinusoidal (harmonic) force is investigated. The gating ratchet effect is observed when another harmonic is used to modulate the spatially symmetric ...
Artículo
Overdamped sine-Gordon kink in a thermal bath
(1999)
We study sine-Gordon kink diffusion at finite temperature in the overdamped limit. By means of a general perturbative approach, we calculate the first- and second-order ~ in temperature ! contributions to the ...
Artículo
Stability of solitary waves in the nonlinear Dirac equation with arbitrary nonlinearity
(American Physical Society, 2014)
We consider the nonlinear Dirac equation in 1 + 1 dimension with scalar-scalar self interaction g2κ+1(Ψ¯¯¯Ψ)κ+1 and with mass m. Using the exact analytic form for rest frame solitary waves of the form Ψ(x,t)=ψ(x)e−iωt for ...
Artículo
Nonlinear Schrödinger equation with spatiotemporal perturbations
(2010)
We investigate the dynamics of solitons of the cubic nonlinear Schrödinger equation (NLSE) with the following perturbations: nonparametric spatiotemporal driving of the form f(x,t)=a exp[iK(t)x], damping, and a linear term ...