Transport through an interacting system connected to leads
Keldysh formalism is used to find the current-voltage characteristics of a small system of interacting electrons described by a Hubbard model coupled to metallic wires. The numerical procedure is checked and the well known results for an Anderson impurity are found. When larger interacting regions a...
Guardado en:
| Publicado: |
2003
|
|---|---|
| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09538984_v15_n50_p8805_Chiappe http://hdl.handle.net/20.500.12110/paper_09538984_v15_n50_p8805_Chiappe |
| Aporte de: |
| id |
paper:paper_09538984_v15_n50_p8805_Chiappe |
|---|---|
| record_format |
dspace |
| spelling |
paper:paper_09538984_v15_n50_p8805_Chiappe2023-06-08T15:55:35Z Transport through an interacting system connected to leads Current voltage characteristics Electric currents Electric potential Electrochemistry Electrons Electrostatics Energy gap Numerical methods Semiconductor quantum wires Electrochemical potential Mesoscopic systems Electrodes Keldysh formalism is used to find the current-voltage characteristics of a small system of interacting electrons described by a Hubbard model coupled to metallic wires. The numerical procedure is checked and the well known results for an Anderson impurity are found. When larger interacting regions are considered, quite different results are obtained depending on whether the Hubbard part is half-filled or not. At half-filling, the existence of an energy gap for charge excitations manifests itself by making the current exponentially small as a function both of the number of interacting sites and the value of U. The behaviour changes at large voltages above the gap energy when activated charge transport takes place. In contrast, for filling factors other than half, the current goes through the interacting system and suffers just a small amount of scattering at both connections. Conductance depends slightly on U and much more on the filling factor but not on the length of the interacting region. 2003 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09538984_v15_n50_p8805_Chiappe http://hdl.handle.net/20.500.12110/paper_09538984_v15_n50_p8805_Chiappe |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Current voltage characteristics Electric currents Electric potential Electrochemistry Electrons Electrostatics Energy gap Numerical methods Semiconductor quantum wires Electrochemical potential Mesoscopic systems Electrodes |
| spellingShingle |
Current voltage characteristics Electric currents Electric potential Electrochemistry Electrons Electrostatics Energy gap Numerical methods Semiconductor quantum wires Electrochemical potential Mesoscopic systems Electrodes Transport through an interacting system connected to leads |
| topic_facet |
Current voltage characteristics Electric currents Electric potential Electrochemistry Electrons Electrostatics Energy gap Numerical methods Semiconductor quantum wires Electrochemical potential Mesoscopic systems Electrodes |
| description |
Keldysh formalism is used to find the current-voltage characteristics of a small system of interacting electrons described by a Hubbard model coupled to metallic wires. The numerical procedure is checked and the well known results for an Anderson impurity are found. When larger interacting regions are considered, quite different results are obtained depending on whether the Hubbard part is half-filled or not. At half-filling, the existence of an energy gap for charge excitations manifests itself by making the current exponentially small as a function both of the number of interacting sites and the value of U. The behaviour changes at large voltages above the gap energy when activated charge transport takes place. In contrast, for filling factors other than half, the current goes through the interacting system and suffers just a small amount of scattering at both connections. Conductance depends slightly on U and much more on the filling factor but not on the length of the interacting region. |
| title |
Transport through an interacting system connected to leads |
| title_short |
Transport through an interacting system connected to leads |
| title_full |
Transport through an interacting system connected to leads |
| title_fullStr |
Transport through an interacting system connected to leads |
| title_full_unstemmed |
Transport through an interacting system connected to leads |
| title_sort |
transport through an interacting system connected to leads |
| publishDate |
2003 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09538984_v15_n50_p8805_Chiappe http://hdl.handle.net/20.500.12110/paper_09538984_v15_n50_p8805_Chiappe |
| _version_ |
1768543571052331008 |