Journal
PHYSICA B-CONDENSED MATTER
Volume 613, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physb.2021.412976
Keywords
Molecular electronics; Quantum transport; STM-Theory
Categories
Funding
- Federal University of Pernambuco (Brazil)
- Portuguese Foundation for Science and Technology (FCT) [UIDB/04650/2020, POCI010145FEDER028108]
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In this work, the charge transport through a nanostructure composed by a double quantum dot was theoretically studied in two different ways: as a single junction (SJ) and a double junction (DJ). Despite starting with different general formulae for transmission, the results obtained with SJ and DJ treatment were shown to be identical for a minimum two-level model system. Finally, a minimal model for a biphenyl system was analyzed in terms of a SJ point of view using both treatments.
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.
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