Abstract:
We discuss the connections between Brownian ratchets (BR) and stochastic resonance (SR). We consider a periodic potential energy landscape with no left-right symmetry that is driven by an external force which can be derived from a potential that is periodic both in time and space. We show that this system presents two thermal enhancements within two different windows of the temperature. One is associated with a "coherent diffusion" by which particles jump back and forth between the minima of the periodic potential in synchrony with the external driving. The other is instead associated with a "coherent directional transport" by which particles hop synchronically from one minimum of the ratchet to the next. We calculate the current and the diffusion coefficients and show how transport undergoes a resonant enhancement. While the former is always present, the second only appears when left-right symmetry is broken. © 2005 Elsevier B.V. All rights reserved.
Registro:
Documento: |
Artículo
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Título: | Stochastic resonance and Brownian ratchets |
Autor: | Fendrik, A.J.; Romanelli, L.; Perazzo, R.P.J. |
Filiación: | Departamento de Física J.J.Giambiagi, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, 1428 Buenos Aires, Argentina Instituto de Ciencias, Universidad de General Sarmiento, J.M.Gutierrez 1150, 1613 Los Polvorines, Buenos Aires, Argentina Departamento de Investigación y Desarrollo, Instituto Tecnológico de Buenos Aires, Avda. Madero 399, 1106 Buenos Aires, Argentina
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Palabras clave: | Brownian motors; Coherent transport; Diffusion; Thermal enhancement; Transport phenomena; Diffusion; Potential energy; Resonance; Transport properties; Brownian motors; Coherent transport; Thermal enhancement; Statistical mechanics |
Año: | 2006
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Volumen: | 359
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Número: | 1-4
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Página de inicio: | 75
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Página de fin: | 84
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DOI: |
http://dx.doi.org/10.1016/j.physa.2005.04.035 |
Título revista: | Physica A: Statistical Mechanics and its Applications
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Título revista abreviado: | Phys A Stat Mech Appl
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ISSN: | 03784371
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CODEN: | PHYAD
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Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03784371_v359_n1-4_p75_Fendrik |
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Citas:
---------- APA ----------
Fendrik, A.J., Romanelli, L. & Perazzo, R.P.J.
(2006)
. Stochastic resonance and Brownian ratchets. Physica A: Statistical Mechanics and its Applications, 359(1-4), 75-84.
http://dx.doi.org/10.1016/j.physa.2005.04.035---------- CHICAGO ----------
Fendrik, A.J., Romanelli, L., Perazzo, R.P.J.
"Stochastic resonance and Brownian ratchets"
. Physica A: Statistical Mechanics and its Applications 359, no. 1-4
(2006) : 75-84.
http://dx.doi.org/10.1016/j.physa.2005.04.035---------- MLA ----------
Fendrik, A.J., Romanelli, L., Perazzo, R.P.J.
"Stochastic resonance and Brownian ratchets"
. Physica A: Statistical Mechanics and its Applications, vol. 359, no. 1-4, 2006, pp. 75-84.
http://dx.doi.org/10.1016/j.physa.2005.04.035---------- VANCOUVER ----------
Fendrik, A.J., Romanelli, L., Perazzo, R.P.J. Stochastic resonance and Brownian ratchets. Phys A Stat Mech Appl. 2006;359(1-4):75-84.
http://dx.doi.org/10.1016/j.physa.2005.04.035