Probabilidad de transmisión en cadenas desordenadas de ADN
C. A. Plazas, K. M. Fonseca-Romero y R. R. Rey-González
Departamento de Física, Universidad Nacional de Colombia, Ciudad Universitaria, 11321, Bogotá D.C., Colombia.
Received 14 March 2014; ]]> Accepted 4 August 2014.
Resumen
En los últimos años ha crecido el interés de utilizar los ácidos nucleídos y proteínas en nanodispositivos. Sin embargo, algunas de sus propiedades electrónicas aún no se entienden claramente. Abordamos el problema de la transmisión electrónica a través de un segmento finito de ADN, usando un modelo de cadena lineal dentro del formalismo de enlace fuerte con interacción a primeros vecinos y un orbital por sitio para representar el ADN. Los efectos de hidratación se incluyen como variaciones aleatorias de las autoenergías. La probabilidad de transmisión se calcula a partir del concepto de matriz de transferencia.
Descriptores: ADN; probabilidad de transmisión; desorden.
Abstract
In the last years have grown the interest to use nucleic acids and proteins in nanodevices. However, some their electronic properties remain unclear and there is still much more to be done. We address the problem of charge transport across a finite segment of DNA, using a linear chain model into tight binding framework with nearest neighbors interaction and one orbital per site to represent the DNA. Hydrations effects are taken into account as random variations of the self-energy. Transmission probability is calculated from transfer matrix concept.
Keywords: DNA; transmission probability; disorder.
]]> PACS: 73.22.Pr; 87.14.gk; 73.63.-b; 71.23.An
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Agradecimientos
Los autores agradecen el apoyo financiero del Departamento Administrativo de Ciencia, Tecnología e Innovación COLCIENCIAS, Colombia, Proyecto 110156933525 y a la División de Investigación Sede Bogotá, Universidad Nacional de Colombia, Proyectos 19023 y 19028.
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]]> 48. C. A. Plazas, K. M. Fonseca-Romero, and R. R. Rey-Gonz'alez, To be published. ]]>