Electron Transport in Carbon Nanotubes with Adsorbed Chromium Impurities
We employ Green’s function method for describing multiband models with magnetic impurities and apply the formalism to the problem of chromium impurities adsorbed onto a carbon nanotube. Density functional theory is used to determine the bandstructure, which is then fit to a tight-binding m...
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doaj-6f12005bc0694ea6aca9f826aca7261d2020-11-24T22:15:45ZengMDPI AGMaterials1996-19442019-02-0112352410.3390/ma12030524ma12030524Electron Transport in Carbon Nanotubes with Adsorbed Chromium ImpuritiesStanislav Repetsky0Iryna Vyshyvana1Yasuhiro Nakazawa2Sergei Kruchinin3Stefano Bellucci4Institute of High Technologies, Taras Shevchenko Kyiv National University, 02033 Kyiv, UkraineInstitute of High Technologies, Taras Shevchenko Kyiv National University, 02033 Kyiv, UkraineDepartment of Chemistry, Graduate School of Science, Osaka University, 560-0043 Osaka, JapanBogolyubov Institute for Theoretical Physics, 03143 Kyiv, UkraineINFN-Laboratori Nazionali di Frascati, Via E. Fermi 40, 00044 Frascati, ItalyWe employ Green’s function method for describing multiband models with magnetic impurities and apply the formalism to the problem of chromium impurities adsorbed onto a carbon nanotube. Density functional theory is used to determine the bandstructure, which is then fit to a tight-binding model to allow for the subsequent Green’s function description. Electron⁻electron interactions, electron⁻phonon coupling, and disorder scattering are all taken into account (perturbatively) with a theory that involves a cluster extension of the coherent potential approximation. We show how increasing the cluster size produces more accurate results and how the final calculations converge as a function of the cluster size. We examine the spin-polarized electrical current on the nanotube generated by the magnetic impurities adsorbed onto the nanotube surface. The spin polarization increases with both increasing concentration of chromium impurities and with increasing magnetic field. Its origin arises from the strong electron correlations generated by the Cr impurities.https://www.mdpi.com/1996-1944/12/3/524carbon nanotubeschromium impuritiesspin-depended transportGreen’s functionmultiband Hamiltonianelectron correlation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Stanislav Repetsky Iryna Vyshyvana Yasuhiro Nakazawa Sergei Kruchinin Stefano Bellucci |
spellingShingle |
Stanislav Repetsky Iryna Vyshyvana Yasuhiro Nakazawa Sergei Kruchinin Stefano Bellucci Electron Transport in Carbon Nanotubes with Adsorbed Chromium Impurities Materials carbon nanotubes chromium impurities spin-depended transport Green’s function multiband Hamiltonian electron correlation |
author_facet |
Stanislav Repetsky Iryna Vyshyvana Yasuhiro Nakazawa Sergei Kruchinin Stefano Bellucci |
author_sort |
Stanislav Repetsky |
title |
Electron Transport in Carbon Nanotubes with Adsorbed Chromium Impurities |
title_short |
Electron Transport in Carbon Nanotubes with Adsorbed Chromium Impurities |
title_full |
Electron Transport in Carbon Nanotubes with Adsorbed Chromium Impurities |
title_fullStr |
Electron Transport in Carbon Nanotubes with Adsorbed Chromium Impurities |
title_full_unstemmed |
Electron Transport in Carbon Nanotubes with Adsorbed Chromium Impurities |
title_sort |
electron transport in carbon nanotubes with adsorbed chromium impurities |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2019-02-01 |
description |
We employ Green’s function method for describing multiband models with magnetic impurities and apply the formalism to the problem of chromium impurities adsorbed onto a carbon nanotube. Density functional theory is used to determine the bandstructure, which is then fit to a tight-binding model to allow for the subsequent Green’s function description. Electron⁻electron interactions, electron⁻phonon coupling, and disorder scattering are all taken into account (perturbatively) with a theory that involves a cluster extension of the coherent potential approximation. We show how increasing the cluster size produces more accurate results and how the final calculations converge as a function of the cluster size. We examine the spin-polarized electrical current on the nanotube generated by the magnetic impurities adsorbed onto the nanotube surface. The spin polarization increases with both increasing concentration of chromium impurities and with increasing magnetic field. Its origin arises from the strong electron correlations generated by the Cr impurities. |
topic |
carbon nanotubes chromium impurities spin-depended transport Green’s function multiband Hamiltonian electron correlation |
url |
https://www.mdpi.com/1996-1944/12/3/524 |
work_keys_str_mv |
AT stanislavrepetsky electrontransportincarbonnanotubeswithadsorbedchromiumimpurities AT irynavyshyvana electrontransportincarbonnanotubeswithadsorbedchromiumimpurities AT yasuhironakazawa electrontransportincarbonnanotubeswithadsorbedchromiumimpurities AT sergeikruchinin electrontransportincarbonnanotubeswithadsorbedchromiumimpurities AT stefanobellucci electrontransportincarbonnanotubeswithadsorbedchromiumimpurities |
_version_ |
1725793319970144256 |