Magnetic generation of normal pseudo-spin polarization in disordered graphene

Abstract Spin to pseudo-spin conversion by which the non-equilibrium normal sublattice pseudo-spin polarization could be achieved by magnetic field has been proposed in graphene. Calculations have been performed within the Kubo approach for both pure and disordered graphene including vertex correcti...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	R. Baghran, M. M. Tehranchi, A. Phirouznia
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/f99cfad2bbc34bd88716aea649149ce6
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:f99cfad2bbc34bd88716aea649149ce6
record_format	dspace
spelling	oai:doaj.org-article:f99cfad2bbc34bd88716aea649149ce62021-12-02T17:55:13ZMagnetic generation of normal pseudo-spin polarization in disordered graphene10.1038/s41598-021-94218-02045-2322https://doaj.org/article/f99cfad2bbc34bd88716aea649149ce62021-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-94218-0https://doaj.org/toc/2045-2322Abstract Spin to pseudo-spin conversion by which the non-equilibrium normal sublattice pseudo-spin polarization could be achieved by magnetic field has been proposed in graphene. Calculations have been performed within the Kubo approach for both pure and disordered graphene including vertex corrections of impurities. Results indicate that the normal magnetic field $$B_z$$ B z produces pseudo-spin polarization in graphene regardless of whether the contribution of vertex corrections has been taken into account or not. This is because of non-vanishing correlation between the $$\sigma _z$$ σ z and $$\tau _z$$ τ z provided by the co-existence of extrinsic Rashba and intrinsic spin–orbit interactions which combines normal spin and pseudo-spin. For the case of pure graphene, valley-symmetric spin to pseudo-spin response function is obtained. Meanwhile, by taking into account the vertex corrections of impurities the obtained response function is weakened by several orders of magnitude with non-identical contributions of different valleys. This valley-asymmetry originates from the inversion symmetry breaking generated by the scattering matrix. Finally, spin to pseudo-spin conversion in graphene could be realized as a practical technique for both generation and manipulation of normal sublattice pseudo-spin polarization by an accessible magnetic field in a easy way. This novel proposed effect not only offers the opportunity to selective manipulation of carrier densities on different sublattice but also could be employed in data transfer technology. The normal pseudo-spin polarization which manifests it self as electron population imbalance of different sublattices can be detected by optical spectroscopy measurements.R. BaghranM. M. TehranchiA. PhirouzniaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q R. Baghran M. M. Tehranchi A. Phirouznia Magnetic generation of normal pseudo-spin polarization in disordered graphene
description	Abstract Spin to pseudo-spin conversion by which the non-equilibrium normal sublattice pseudo-spin polarization could be achieved by magnetic field has been proposed in graphene. Calculations have been performed within the Kubo approach for both pure and disordered graphene including vertex corrections of impurities. Results indicate that the normal magnetic field $$B_z$$ B z produces pseudo-spin polarization in graphene regardless of whether the contribution of vertex corrections has been taken into account or not. This is because of non-vanishing correlation between the $$\sigma _z$$ σ z and $$\tau _z$$ τ z provided by the co-existence of extrinsic Rashba and intrinsic spin–orbit interactions which combines normal spin and pseudo-spin. For the case of pure graphene, valley-symmetric spin to pseudo-spin response function is obtained. Meanwhile, by taking into account the vertex corrections of impurities the obtained response function is weakened by several orders of magnitude with non-identical contributions of different valleys. This valley-asymmetry originates from the inversion symmetry breaking generated by the scattering matrix. Finally, spin to pseudo-spin conversion in graphene could be realized as a practical technique for both generation and manipulation of normal sublattice pseudo-spin polarization by an accessible magnetic field in a easy way. This novel proposed effect not only offers the opportunity to selective manipulation of carrier densities on different sublattice but also could be employed in data transfer technology. The normal pseudo-spin polarization which manifests it self as electron population imbalance of different sublattices can be detected by optical spectroscopy measurements.
format	article
author	R. Baghran M. M. Tehranchi A. Phirouznia
author_facet	R. Baghran M. M. Tehranchi A. Phirouznia
author_sort	R. Baghran
title	Magnetic generation of normal pseudo-spin polarization in disordered graphene
title_short	Magnetic generation of normal pseudo-spin polarization in disordered graphene
title_full	Magnetic generation of normal pseudo-spin polarization in disordered graphene
title_fullStr	Magnetic generation of normal pseudo-spin polarization in disordered graphene
title_full_unstemmed	Magnetic generation of normal pseudo-spin polarization in disordered graphene
title_sort	magnetic generation of normal pseudo-spin polarization in disordered graphene
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/f99cfad2bbc34bd88716aea649149ce6
work_keys_str_mv	AT rbaghran magneticgenerationofnormalpseudospinpolarizationindisorderedgraphene AT mmtehranchi magneticgenerationofnormalpseudospinpolarizationindisorderedgraphene AT aphirouznia magneticgenerationofnormalpseudospinpolarizationindisorderedgraphene
_version_	1718379145699786752

Magnetic generation of normal pseudo-spin polarization in disordered graphene

Ejemplares similares