Spin and valley filtering properties in a ferromagnetic 8-pmmn borophene monolayer

Authorsفاطمه ایمانیان مفردبیدگلی,حسین نیکوفرد,نرگس نیکوفرد,مهدی اسماعیل‌زاده
JournalJournal of Physics and Chemistry of Solids
Page number111933
Volume number188
IF4
Paper TypeFull Paper
Published At2024-02-10
Journal GradeScientific - research
Journal TypeElectronic
Journal CountryIran, Islamic Republic Of
Journal IndexSCOPUS ,JCR

Abstract

We study spin- and valley-dependent transport properties in a n-p–n junction of 8-pmmn borophene monolayer. We show that an exchange magnetic field can generate spin polarization in the system and a gate voltage, as a potential barrier, induces valley polarization. The valley polarization, induced by the gate voltage, is due to the anisotropic and tilted Dirac cones of borophene structure. This property is the advantage of borophene over the other 2D materials with isotropic and non-tilted Dirac cones such as graphene in which a gate potential cannot induce valley polarization. We also show that the proposed device (borophene-based n-p–n junction) can work as perfect spin and perfect valley filters. The spin and valley filters can be controlled by changing the gate voltage and/or Fermi energy. The results of this study show that borophene has a suitable potential to be used in spintronic and valleytronic devices.

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