Transient spin dynamics in semiconductors
Autor(a) principal: | |
---|---|
Data de Publicação: | 2006 |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Brazilian Journal of Physics |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332006000600014 |
Resumo: | We investigate the spin-resolved dynamics of spin-polarized carriers injected via a ferromagnetic scanning-tunnelling-microscope tip (STM tip) into uniformly and non-uniformly n-doped bulk semiconductor - externally driven by a current source. We propagate the injected spin packets (assumed gaussian in space at t = 0) by considering a spin hydrodynamic approach based on balance equations directly derived from a spin-dependent Boltzmann equation. We determine the spin-polarization landscapes (time and position) of the carrier population $(n_(\uparrow}-n_{\downarrow})/(n_{\uparrow}+n_{\downarrow}$ and the current density $(j_{\uparrow}-j_{\downarrow})/(j_{\uparrow}+j_{\downarrow})$. While in the uniformly-doped system the carrier spin-polarization has a slow decay, in the non-uniformly doped system it shows a drastic fall down in the interface. In contrast the current spin-polarization exhibits an enhancement for both of the systems particularly in the interface. |
id |
SBF-2_bcc75cdf83f099173ed8ef402ddfac42 |
---|---|
oai_identifier_str |
oai:scielo:S0103-97332006000600014 |
network_acronym_str |
SBF-2 |
network_name_str |
Brazilian Journal of Physics |
repository_id_str |
|
spelling |
Transient spin dynamics in semiconductorsSpin polarized transportSemiconductorsInterfacesElectrical injectionWe investigate the spin-resolved dynamics of spin-polarized carriers injected via a ferromagnetic scanning-tunnelling-microscope tip (STM tip) into uniformly and non-uniformly n-doped bulk semiconductor - externally driven by a current source. We propagate the injected spin packets (assumed gaussian in space at t = 0) by considering a spin hydrodynamic approach based on balance equations directly derived from a spin-dependent Boltzmann equation. We determine the spin-polarization landscapes (time and position) of the carrier population $(n_(\uparrow}-n_{\downarrow})/(n_{\uparrow}+n_{\downarrow}$ and the current density $(j_{\uparrow}-j_{\downarrow})/(j_{\uparrow}+j_{\downarrow})$. While in the uniformly-doped system the carrier spin-polarization has a slow decay, in the non-uniformly doped system it shows a drastic fall down in the interface. In contrast the current spin-polarization exhibits an enhancement for both of the systems particularly in the interface.Sociedade Brasileira de Física2006-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332006000600014Brazilian Journal of Physics v.36 n.3b 2006reponame:Brazilian Journal of Physicsinstname:Sociedade Brasileira de Física (SBF)instacron:SBF10.1590/S0103-97332006000600014info:eu-repo/semantics/openAccessVillegas-Lelovsky,L.eng2006-11-29T00:00:00Zoai:scielo:S0103-97332006000600014Revistahttp://www.sbfisica.org.br/v1/home/index.php/pt/ONGhttps://old.scielo.br/oai/scielo-oai.phpsbfisica@sbfisica.org.br||sbfisica@sbfisica.org.br1678-44480103-9733opendoar:2006-11-29T00:00Brazilian Journal of Physics - Sociedade Brasileira de Física (SBF)false |
dc.title.none.fl_str_mv |
Transient spin dynamics in semiconductors |
title |
Transient spin dynamics in semiconductors |
spellingShingle |
Transient spin dynamics in semiconductors Villegas-Lelovsky,L. Spin polarized transport Semiconductors Interfaces Electrical injection |
title_short |
Transient spin dynamics in semiconductors |
title_full |
Transient spin dynamics in semiconductors |
title_fullStr |
Transient spin dynamics in semiconductors |
title_full_unstemmed |
Transient spin dynamics in semiconductors |
title_sort |
Transient spin dynamics in semiconductors |
author |
Villegas-Lelovsky,L. |
author_facet |
Villegas-Lelovsky,L. |
author_role |
author |
dc.contributor.author.fl_str_mv |
Villegas-Lelovsky,L. |
dc.subject.por.fl_str_mv |
Spin polarized transport Semiconductors Interfaces Electrical injection |
topic |
Spin polarized transport Semiconductors Interfaces Electrical injection |
description |
We investigate the spin-resolved dynamics of spin-polarized carriers injected via a ferromagnetic scanning-tunnelling-microscope tip (STM tip) into uniformly and non-uniformly n-doped bulk semiconductor - externally driven by a current source. We propagate the injected spin packets (assumed gaussian in space at t = 0) by considering a spin hydrodynamic approach based on balance equations directly derived from a spin-dependent Boltzmann equation. We determine the spin-polarization landscapes (time and position) of the carrier population $(n_(\uparrow}-n_{\downarrow})/(n_{\uparrow}+n_{\downarrow}$ and the current density $(j_{\uparrow}-j_{\downarrow})/(j_{\uparrow}+j_{\downarrow})$. While in the uniformly-doped system the carrier spin-polarization has a slow decay, in the non-uniformly doped system it shows a drastic fall down in the interface. In contrast the current spin-polarization exhibits an enhancement for both of the systems particularly in the interface. |
publishDate |
2006 |
dc.date.none.fl_str_mv |
2006-09-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332006000600014 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332006000600014 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0103-97332006000600014 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Física |
publisher.none.fl_str_mv |
Sociedade Brasileira de Física |
dc.source.none.fl_str_mv |
Brazilian Journal of Physics v.36 n.3b 2006 reponame:Brazilian Journal of Physics instname:Sociedade Brasileira de Física (SBF) instacron:SBF |
instname_str |
Sociedade Brasileira de Física (SBF) |
instacron_str |
SBF |
institution |
SBF |
reponame_str |
Brazilian Journal of Physics |
collection |
Brazilian Journal of Physics |
repository.name.fl_str_mv |
Brazilian Journal of Physics - Sociedade Brasileira de Física (SBF) |
repository.mail.fl_str_mv |
sbfisica@sbfisica.org.br||sbfisica@sbfisica.org.br |
_version_ |
1754734863316942848 |