Perfect switching of the spin polarization in a ferromagnetic gapless graphene/superconducting gapped graphene junction
Issued Date
2010
Resource Type
Language
eng
Rights
Mahidol University
Rights Holder(s)
ScienceDirect
Bibliographic Citation
Physica C: Superconductivity and its Applications. Vol. 470, No.1 (2010), 31-36.
Suggested Citation
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. Physica C: Superconductivity and its Applications. Vol. 470, No.1 (2010), 31-36.. Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/40247
Title
Perfect switching of the spin polarization in a ferromagnetic gapless graphene/superconducting gapped graphene junction
Other Contributor(s)
Abstract
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.