Utilize este identificador para referenciar este registo:
https://hdl.handle.net/1822/78404
Título: | Double versus single junction: from tunneling to contact regime in a double quantum dot molecule system |
Autor(es): | Moreira, A. C. L. Marques, L. |
Palavras-chave: | Molecular electronics Quantum transport STM-Theory |
Data: | 27-Mar-2021 |
Editora: | Elsevier 1 |
Revista: | Physica B: Condensed Matter |
Resumo(s): | In this work a theoretical study of the charge transport through a nanostructure composed by a double quantum dot was made by treating the system in two different ways: as single junction (SJ) within the scanning tunneling microscopy theory and a double junction (DJ) within the usual non equilibrium Green's function theory approach. In the first case (SJ), the three blocks - contact-device-contact - is treated as a single junction by 'breaking' the nanostructure into two parts and considering each one as belonging to an 'extended contact'. In the DJ case, the usual treatment with two contacts-related broadening and the exact Green's function describing the propagation inside the system was made. Proceeding in this way, for a minimum two-level model system, we show that the results obtained with the SJ and DJ treatment are identical despite they start with a different general formulae for transmission. Finally, both treatments were used with a minimal model for a biphenyl system in an asymmetric sample-biphenyl-tip configuration and analyzed in terms of a SJ point of view bringing another perspective to the main features of this system. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/78404 |
DOI: | 10.1016/j.physb.2021.412976 |
ISSN: | 0921-4526 |
Versão da editora: | https://www.sciencedirect.com/science/article/pii/S0921452621001757?via%3Dihub |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CDF - FCT - Artigos/Papers (with refereeing) |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Double versus Single junction approaches for nanoscale transport.pdf | 1,19 MB | Adobe PDF | Ver/Abrir |