منابع مشابه
Soliton ratchets out of point-like inhomogeneities
– We introduce and study a novel design for a ratchet potential for soliton excitations. The potential is implemented by means of an array of point-like (delta) inhomogeneities in an otherwise homogeneous potential. We develop a collective coordinate theory that predicts that the effective potential acting on the soliton is periodic but asymmetric and gives rise to the ratchet effect. Numerical...
متن کاملEnergy flow for soliton ratchets
– We study the mechanism of directed energy transport for soliton ratchets. The energy flow appears due to the progressive motion of a soliton (kink) which is an energy carrier. However, the energy current formed by internal system deformations (the total field momentum) is zero. We show that the energy flow is realized via an inhomogeneous energy exchange between the system and the external ac...
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Recently Phys. Rev. Lett. 88, 184101 (2002)]] used a symmetry analysis to predict the appearance of directed energy current in homogeneously spatially extended systems coupled to a heat bath in the presence of an external ac field E (t). Their symmetry analysis allowed them to make the right choice of E (t) so as to obtain symmetry breaking which causes directed energy transport for systems wit...
متن کاملSoliton ratchets in homogeneous nonlinear Klein-Gordon systems.
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 the center of the soliton, X(t), and its width, l(t), we show, first, that energy is inhomogeneously pumped into the system, generating as result a directed motion; and, secon...
متن کاملAn Inverse Problem for Point Inhomogeneities
We study quantum scattering theory off n point inhomogeneities (n ∈ N) in three dimensions. The inhomogeneities (or generalized point interactions) positioned at {ξ1, . . . , ξn} ⊂ R3 are modeled in terms of the n2 (real) parameter family of self-adjoint extensions of−∆ ∣∣ C∞ 0 (R3\{ξ1,...,ξn}) in L2(R3). The Green’s function, the scattering solutions and the scattering amplitude for this model...
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ژورنال
عنوان ژورنال: The European Physical Journal B - Condensed Matter
سال: 2003
ISSN: 1434-6028,1434-6036
DOI: 10.1140/epjb/e2004-00031-3