Perfect switching of the spin polarization in a ferromagnetic gapless graphene/superconducting gapped graphene junction

With the fabrication of gapped graphene, interest in the tunneling spectroscopy in graphene-based FG/SG junctions in which one side consists of a gapless ferro-magnetic graphene (FG) and the other side, of a gapped superconducting graphene (SG) has arisen. The carriers in the gapless (gapped) graphe...

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Main Authors: Bumned Soodchomshom, บำเหน็จ สุดชมโฉม, Tang, I.-M., Rassmidara Hoonsawat, รัศมีดารา หุ่นสวัสดิ์
Other Authors: Mahidol University International College.
Format: Article
Language:English
Published: 2015
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Online Access:https://repository.li.mahidol.ac.th/handle/123456789/40247
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spelling th-mahidol.402472023-04-12T15:27:47Z Perfect switching of the spin polarization in a ferromagnetic gapless graphene/superconducting gapped graphene junction Bumned Soodchomshom บำเหน็จ สุดชมโฉม Tang, I.-M. Rassmidara Hoonsawat รัศมีดารา หุ่นสวัสดิ์ Mahidol University International College. Ferromagnet/superconductor junction Gapped graphene Massive Dirac electron Specular Andreev reflection Spin transport With the fabrication of gapped graphene, interest in the tunneling spectroscopy in graphene-based FG/SG junctions in which one side consists of a gapless ferro-magnetic graphene (FG) and the other side, of a gapped superconducting graphene (SG) has arisen. The carriers in the gapless (gapped) graphene are 2D relativistic particles having an energy spectrum given by E = sqrt( 2 vF 2 k2 +(mvF 2)2) (where mvF 2 is the gap and vF is the Fermi velocity). The spin currents in this FG/SG junction are obtained within the framework of the extended Blonder-Tinkham-Klapwijk (BTK) formalism. The effects of the superconducting energy gap in SG, of the gap mvF 2 which opened in the superconducting graphene, of the exchange field in FG, of the spin-dependent specular Andreev reflection, of the effective Fermi energy (EFF) of FG and of the bias voltage across the junction (V) are simulated. It is seen that by adjusting EFF or V, the spin polarization (defined as SP(%) = 100% × (G↑ - G↓)/(G↑ + G↓)) can be switched from a pure spin up (SP = +100%) state to pure spin down (SP = -100%) state. 2015-08-03T09:35:59Z 2018-12-25T09:12:10Z 2015-08-03T09:35:59Z 2018-12-25T09:12:10Z 2015 2010 Article Physica C: Superconductivity and its Applications. Vol. 470, No.1 (2010), 31-36. https://repository.li.mahidol.ac.th/handle/123456789/40247 eng Mahidol University ScienceDirect
institution Mahidol University
building Mahidol University Library
continent Asia
country Thailand
Thailand
content_provider Mahidol University Library
collection Mahidol University Institutional Repository
language English
topic Ferromagnet/superconductor junction
Gapped graphene
Massive Dirac electron
Specular Andreev reflection
Spin transport
spellingShingle Ferromagnet/superconductor junction
Gapped graphene
Massive Dirac electron
Specular Andreev reflection
Spin transport
Bumned Soodchomshom
บำเหน็จ สุดชมโฉม
Tang, I.-M.
Rassmidara Hoonsawat
รัศมีดารา หุ่นสวัสดิ์
Perfect switching of the spin polarization in a ferromagnetic gapless graphene/superconducting gapped graphene junction
description With the fabrication of gapped graphene, interest in the tunneling spectroscopy in graphene-based FG/SG junctions in which one side consists of a gapless ferro-magnetic graphene (FG) and the other side, of a gapped superconducting graphene (SG) has arisen. The carriers in the gapless (gapped) graphene are 2D relativistic particles having an energy spectrum given by E = sqrt( 2 vF 2 k2 +(mvF 2)2) (where mvF 2 is the gap and vF is the Fermi velocity). The spin currents in this FG/SG junction are obtained within the framework of the extended Blonder-Tinkham-Klapwijk (BTK) formalism. The effects of the superconducting energy gap in SG, of the gap mvF 2 which opened in the superconducting graphene, of the exchange field in FG, of the spin-dependent specular Andreev reflection, of the effective Fermi energy (EFF) of FG and of the bias voltage across the junction (V) are simulated. It is seen that by adjusting EFF or V, the spin polarization (defined as SP(%) = 100% × (G↑ - G↓)/(G↑ + G↓)) can be switched from a pure spin up (SP = +100%) state to pure spin down (SP = -100%) state.
author2 Mahidol University International College.
author_facet Mahidol University International College.
Bumned Soodchomshom
บำเหน็จ สุดชมโฉม
Tang, I.-M.
Rassmidara Hoonsawat
รัศมีดารา หุ่นสวัสดิ์
format Article
author Bumned Soodchomshom
บำเหน็จ สุดชมโฉม
Tang, I.-M.
Rassmidara Hoonsawat
รัศมีดารา หุ่นสวัสดิ์
author_sort Bumned Soodchomshom
title Perfect switching of the spin polarization in a ferromagnetic gapless graphene/superconducting gapped graphene junction
title_short Perfect switching of the spin polarization in a ferromagnetic gapless graphene/superconducting gapped graphene junction
title_full Perfect switching of the spin polarization in a ferromagnetic gapless graphene/superconducting gapped graphene junction
title_fullStr Perfect switching of the spin polarization in a ferromagnetic gapless graphene/superconducting gapped graphene junction
title_full_unstemmed Perfect switching of the spin polarization in a ferromagnetic gapless graphene/superconducting gapped graphene junction
title_sort perfect switching of the spin polarization in a ferromagnetic gapless graphene/superconducting gapped graphene junction
publishDate 2015
url https://repository.li.mahidol.ac.th/handle/123456789/40247
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