High efficiency spin-valve and spin-filter in a doped rhombic graphene quantum dot device

P. V. Silva; A. Saraiva-Souza; D. W. Maia; F. M. Souza; A. G.Souza Filho; V. Meunier; E. C. Girão

doi:10.1016/j.jmmm.2017.11.089

High efficiency spin-valve and spin-filter in a doped rhombic graphene quantum dot device

P. V. Silva, A. Saraiva-Souza, D. W. Maia, F. M. Souza, A. G.Souza Filho, V. Meunier, E. C. Girão

Engineering Science and Mechanics

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

Spin-polarized transport through a rhombic graphene quantum dot (rGQD) attached to armchair graphene nanoribbon (AGNR) electrodes is investigated by means of the Green's function technique combined with single-band tight-binding (TB) approach including a Hubbard-like term. The Hubbard repulsion was included within the mean-field approximation. Compared to anti-ferromagnetic (AFM), we show that the ferromagnetic (FM) ordering of the rGQD corresponds to a smaller bandgap, thus resulting in an efficient spin injector. As a consequence, the electron transport spectrum reveals a spin valve effect, which is controlled by doping with B/N atoms creating a p-n-type junction. The calculations point out that such systems can be used as spin-filter devices with efficiency close to a 100%.

Original language	English (US)
Pages (from-to)	532-539
Number of pages	8
Journal	Journal of Magnetism and Magnetic Materials
Volume	451
DOIs	https://doi.org/10.1016/j.jmmm.2017.11.089
State	Published - Apr 1 2018

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1016/j.jmmm.2017.11.089

Cite this

@article{2cffc618caf047bc81b82c17e6426499,

title = "High efficiency spin-valve and spin-filter in a doped rhombic graphene quantum dot device",

abstract = "Spin-polarized transport through a rhombic graphene quantum dot (rGQD) attached to armchair graphene nanoribbon (AGNR) electrodes is investigated by means of the Green's function technique combined with single-band tight-binding (TB) approach including a Hubbard-like term. The Hubbard repulsion was included within the mean-field approximation. Compared to anti-ferromagnetic (AFM), we show that the ferromagnetic (FM) ordering of the rGQD corresponds to a smaller bandgap, thus resulting in an efficient spin injector. As a consequence, the electron transport spectrum reveals a spin valve effect, which is controlled by doping with B/N atoms creating a p-n-type junction. The calculations point out that such systems can be used as spin-filter devices with efficiency close to a 100%.",

author = "Silva, {P. V.} and A. Saraiva-Souza and Maia, {D. W.} and Souza, {F. M.} and Filho, {A. G.Souza} and V. Meunier and Gir{\~a}o, {E. C.}",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier B.V.",

year = "2018",

month = apr,

day = "1",

doi = "10.1016/j.jmmm.2017.11.089",

language = "English (US)",

volume = "451",

pages = "532--539",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier B.V.",

}

TY - JOUR

T1 - High efficiency spin-valve and spin-filter in a doped rhombic graphene quantum dot device

AU - Silva, P. V.

AU - Saraiva-Souza, A.

AU - Maia, D. W.

AU - Souza, F. M.

AU - Filho, A. G.Souza

AU - Meunier, V.

AU - Girão, E. C.

PY - 2018/4/1

Y1 - 2018/4/1

N2 - Spin-polarized transport through a rhombic graphene quantum dot (rGQD) attached to armchair graphene nanoribbon (AGNR) electrodes is investigated by means of the Green's function technique combined with single-band tight-binding (TB) approach including a Hubbard-like term. The Hubbard repulsion was included within the mean-field approximation. Compared to anti-ferromagnetic (AFM), we show that the ferromagnetic (FM) ordering of the rGQD corresponds to a smaller bandgap, thus resulting in an efficient spin injector. As a consequence, the electron transport spectrum reveals a spin valve effect, which is controlled by doping with B/N atoms creating a p-n-type junction. The calculations point out that such systems can be used as spin-filter devices with efficiency close to a 100%.

AB - Spin-polarized transport through a rhombic graphene quantum dot (rGQD) attached to armchair graphene nanoribbon (AGNR) electrodes is investigated by means of the Green's function technique combined with single-band tight-binding (TB) approach including a Hubbard-like term. The Hubbard repulsion was included within the mean-field approximation. Compared to anti-ferromagnetic (AFM), we show that the ferromagnetic (FM) ordering of the rGQD corresponds to a smaller bandgap, thus resulting in an efficient spin injector. As a consequence, the electron transport spectrum reveals a spin valve effect, which is controlled by doping with B/N atoms creating a p-n-type junction. The calculations point out that such systems can be used as spin-filter devices with efficiency close to a 100%.

UR - http://www.scopus.com/inward/record.url?scp=85035757511&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85035757511&partnerID=8YFLogxK

U2 - 10.1016/j.jmmm.2017.11.089

DO - 10.1016/j.jmmm.2017.11.089

M3 - Article

AN - SCOPUS:85035757511

SN - 0304-8853

VL - 451

SP - 532

EP - 539

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

ER -

High efficiency spin-valve and spin-filter in a doped rhombic graphene quantum dot device

Abstract

All Science Journal Classification (ASJC) codes

Access to Document

Other files and links

Fingerprint

Cite this