Interband optical transitions in DNA-like systems
The underlying band structure of the uniform DNA suggests the allowance of interband optical transitions. We consider such transitions in the uniform synthetic DNA, such as the poly(G)-poly(C) DNA, within a simple tight-binding model with a minimum set of parameters. We demonstrate that the helical...
| Autores: | ; ; |
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| Tipo de documento: | Artigo |
| Data de publicação: | 2007 |
| País: | España |
| Recursos: | Universidad Complutense de Madrid (UCM) |
| Repositório: | Docta Complutense |
| Idioma: | Inglês |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/51244 |
| Acesso em linha: | https://hdl.handle.net/20.500.14352/51244 |
| Nível de acesso: | Acesso aberto |
| Palavra-chave: | 538.9 Electrical-Transport Double-Strand Electronic Transport Molecules Conduction Sequence Localization Model Films Física de materiales |
| Resumo: | The underlying band structure of the uniform DNA suggests the allowance of interband optical transitions. We consider such transitions in the uniform synthetic DNA, such as the poly(G)-poly(C) DNA, within a simple tight-binding model with a minimum set of parameters. We demonstrate that the helical conformation of the DNA strands results in unusual interband optical transitions all of which appear to be indirect in k space although the system has a direct band gap energy structure. Simple relationships of the optical gap and absorption linewidth to tight-binding model parameters are found. We study also the effect of disorder in base levels (relevant for the wet form of the DNA) on interband optical transitions. |
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