Tunneling current and noise of entangled electrons in correlated double quantum dot

Abstract We developed general approach for the analysis of tunneling current and its zero frequency noise for a wide class of systems where electron transport occurs through the intermediate structure with localized electrons. Proposed approach opens the possibility to study electron transport throu...

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Autores principales:	N. S. Maslova, P. I. Arseyev, V. N. Mantsevich
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9c17a421990542a8afe63494619207db
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spelling	oai:doaj.org-article:9c17a421990542a8afe63494619207db2021-12-02T17:15:33ZTunneling current and noise of entangled electrons in correlated double quantum dot10.1038/s41598-021-88721-72045-2322https://doaj.org/article/9c17a421990542a8afe63494619207db2021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-88721-7https://doaj.org/toc/2045-2322Abstract We developed general approach for the analysis of tunneling current and its zero frequency noise for a wide class of systems where electron transport occurs through the intermediate structure with localized electrons. Proposed approach opens the possibility to study electron transport through multi-electron correlated states and allows to reveal the influence of spatial and spin symmetry of the total system on the electron transport. This approach is based on Keldysh diagram technique in pseudo-particle representation taking into account the operator constraint on the number of pseudo-particles, which gives the possibility to exclude non-physical states. It was shown that spatial and spin symmetry of the total system can block some channels for electron transport through the correlated quantum dots. Moreover, it was demonstrated that the stationary tunneling current and zero frequency noise in correlated coupled quantum dots depend on initial state of the system. In the frame of the proposed approach it was also shown that for the parallel coupling of two correlated quantum dots to the reservoirs tunneling current and its zero frequency noise are suppressed if tunneling occurs through the entangled triplet state with zero total spin projection on the z axis or enhanced for the tunneling through the singlet state in comparison with electron transport through the uncorrelated localized single-electron state. Obtained results demonstrate that two-electron entangled states in correlated quantum dots give the possibility to tune the zero frequency noise amplitude by blocking some channels for electron transport that is very promising in the sense of two-electron entangled states application in quantum communication and logic devices. The obtained nonmonotonic behavior of Fano factor as a function of applied bias is the direct manifestation of the possibility to control the noise to signal ration in correlated quantum dots. We also provide detailed calculations of current and noise for both single type of carriers and two different types of carriers in the presence and in the absence of Coulomb interaction in Supplementary materials.N. S. MaslovaP. I. ArseyevV. N. MantsevichNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-17 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q N. S. Maslova P. I. Arseyev V. N. Mantsevich Tunneling current and noise of entangled electrons in correlated double quantum dot
description	Abstract We developed general approach for the analysis of tunneling current and its zero frequency noise for a wide class of systems where electron transport occurs through the intermediate structure with localized electrons. Proposed approach opens the possibility to study electron transport through multi-electron correlated states and allows to reveal the influence of spatial and spin symmetry of the total system on the electron transport. This approach is based on Keldysh diagram technique in pseudo-particle representation taking into account the operator constraint on the number of pseudo-particles, which gives the possibility to exclude non-physical states. It was shown that spatial and spin symmetry of the total system can block some channels for electron transport through the correlated quantum dots. Moreover, it was demonstrated that the stationary tunneling current and zero frequency noise in correlated coupled quantum dots depend on initial state of the system. In the frame of the proposed approach it was also shown that for the parallel coupling of two correlated quantum dots to the reservoirs tunneling current and its zero frequency noise are suppressed if tunneling occurs through the entangled triplet state with zero total spin projection on the z axis or enhanced for the tunneling through the singlet state in comparison with electron transport through the uncorrelated localized single-electron state. Obtained results demonstrate that two-electron entangled states in correlated quantum dots give the possibility to tune the zero frequency noise amplitude by blocking some channels for electron transport that is very promising in the sense of two-electron entangled states application in quantum communication and logic devices. The obtained nonmonotonic behavior of Fano factor as a function of applied bias is the direct manifestation of the possibility to control the noise to signal ration in correlated quantum dots. We also provide detailed calculations of current and noise for both single type of carriers and two different types of carriers in the presence and in the absence of Coulomb interaction in Supplementary materials.
format	article
author	N. S. Maslova P. I. Arseyev V. N. Mantsevich
author_facet	N. S. Maslova P. I. Arseyev V. N. Mantsevich
author_sort	N. S. Maslova
title	Tunneling current and noise of entangled electrons in correlated double quantum dot
title_short	Tunneling current and noise of entangled electrons in correlated double quantum dot
title_full	Tunneling current and noise of entangled electrons in correlated double quantum dot
title_fullStr	Tunneling current and noise of entangled electrons in correlated double quantum dot
title_full_unstemmed	Tunneling current and noise of entangled electrons in correlated double quantum dot
title_sort	tunneling current and noise of entangled electrons in correlated double quantum dot
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/9c17a421990542a8afe63494619207db
work_keys_str_mv	AT nsmaslova tunnelingcurrentandnoiseofentangledelectronsincorrelateddoublequantumdot AT piarseyev tunnelingcurrentandnoiseofentangledelectronsincorrelateddoublequantumdot AT vnmantsevich tunnelingcurrentandnoiseofentangledelectronsincorrelateddoublequantumdot
_version_	1718381275934359552

Tunneling current and noise of entangled electrons in correlated double quantum dot

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