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Transport in serial spinful multiple-dot systems: The role of electron-electron interactions and coherences.

Goldozian, Bahareh LU ; Damtie, Fikeraddis LU ; Kirsanskas, Gediminas LU and Wacker, Andreas LU (2016) In Scientific Reports 6.
Abstract
Quantum dots are nanoscopic systems, where carriers are confined in all three spatial directions. Such nanoscopic systems are suitable for fundamental studies of quantum mechanics and are candidates for applications such as quantum information processing. It was also proposed that linear arrangements of quantum dots could be used as quantum cascade laser. In this work we study the impact of electron-electron interactions on transport in a spinful serial triple quantum dot system weakly coupled to two leads. We find that due to electron-electron scattering processes the transport is enabled beyond the common single-particle transmission channels. This shows that the scenario in the serial quantum dots intrinsically deviates from layered... (More)
Quantum dots are nanoscopic systems, where carriers are confined in all three spatial directions. Such nanoscopic systems are suitable for fundamental studies of quantum mechanics and are candidates for applications such as quantum information processing. It was also proposed that linear arrangements of quantum dots could be used as quantum cascade laser. In this work we study the impact of electron-electron interactions on transport in a spinful serial triple quantum dot system weakly coupled to two leads. We find that due to electron-electron scattering processes the transport is enabled beyond the common single-particle transmission channels. This shows that the scenario in the serial quantum dots intrinsically deviates from layered structures such as quantum cascade lasers, where the presence of well-defined single-particle resonances between neighboring levels are crucial for device operation. Additionally, we check the validity of the Pauli master equation by comparing it with the first-order von Neumann approach. Here we demonstrate that coherences are of relevance if the energy spacing of the eigenstates is smaller than the lead transition rate multiplied by ħ. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Scientific Reports
volume
6
publisher
Nature Publishing Group
external identifiers
  • pmid:26948933
  • scopus:84960423234
  • wos:000371463600001
ISSN
2045-2322
DOI
10.1038/srep22761
language
English
LU publication?
yes
id
5dae1656-e8b0-47a4-bd04-6aacd7eb0a30 (old id 8856033)
date added to LUP
2016-03-21 09:29:17
date last changed
2017-11-05 04:08:18
@article{5dae1656-e8b0-47a4-bd04-6aacd7eb0a30,
  abstract     = {Quantum dots are nanoscopic systems, where carriers are confined in all three spatial directions. Such nanoscopic systems are suitable for fundamental studies of quantum mechanics and are candidates for applications such as quantum information processing. It was also proposed that linear arrangements of quantum dots could be used as quantum cascade laser. In this work we study the impact of electron-electron interactions on transport in a spinful serial triple quantum dot system weakly coupled to two leads. We find that due to electron-electron scattering processes the transport is enabled beyond the common single-particle transmission channels. This shows that the scenario in the serial quantum dots intrinsically deviates from layered structures such as quantum cascade lasers, where the presence of well-defined single-particle resonances between neighboring levels are crucial for device operation. Additionally, we check the validity of the Pauli master equation by comparing it with the first-order von Neumann approach. Here we demonstrate that coherences are of relevance if the energy spacing of the eigenstates is smaller than the lead transition rate multiplied by ħ.},
  articleno    = {22761},
  author       = {Goldozian, Bahareh and Damtie, Fikeraddis and Kirsanskas, Gediminas and Wacker, Andreas},
  issn         = {2045-2322},
  language     = {eng},
  publisher    = {Nature Publishing Group},
  series       = {Scientific Reports},
  title        = {Transport in serial spinful multiple-dot systems: The role of electron-electron interactions and coherences.},
  url          = {http://dx.doi.org/10.1038/srep22761},
  volume       = {6},
  year         = {2016},
}