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- 저자 : Bahniman Ghosh (검색결과 4 건)
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Akshaykumar Salimath,Bahniman Ghosh 한국물리학회 2014 Current Applied Physics Vol.14 No.3
In this article, we employ the semiclassical Monte Carlo approach to study the spin polarized electron transport in single layer graphene channel. The Monte Carlo method can treat non-equilibrium carrier transport and effects of external electric and magnetic fields on carrier transport can be incorporated in the formalism. Graphene is the ideal material for spintronics application due to very low Spin Orbit Interaction. Spin relaxation in graphene is caused by D’yakonov-Perel (DP) relaxation and Elliott-Yafet (EY) relaxation. We study effect of electron electron scattering, temperature, magnetic field and driving electric field on spin relaxation length in single layer graphene. We have considered injection polarization along z-direction which is perpendicular to the plane of graphene and the magnitude of ensemble averaged spin variation is studied along the x-direction which is the transport direction. This theoretical investigation is particularly important in order to identify the factors responsible for experimentally observed spin relaxation length in graphene.
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Akshaykumar Salimath,Bahniman Ghosh 한국물리학회 2014 Current Applied Physics Vol.14 No.11
In this article we study the effect of external magnetic field and electric field on spin transport in bilayer armchair graphene nanoribbons (GNR) by employing semiclassical Monte Carlo approach. We include D'yakonov-Perel' (DP) relaxation due to structural inversion asymmetry (Rashba spin-orbit coupling) and Elliott-Yafet (EY) relaxation to model spin dephasing. In the model we neglect the effect of local magnetic moments due to adatoms and vacancies. We have considered injection polarization along z-direction perpendicular to the plane of graphene and the magnitude of ensemble averaged spin variation is studied along the x-direction which is the transport direction. To the best of our knowledge there has been no theoretical investigation of the effects of external magnetic field on spin transport in graphene nanoribbons. This theoretical investigation is important in order to identify the factors responsible for experimentally observed spin relaxation length in graphene GNRs.
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EFFECT OF ELECTRIC FIELD, TEMPERATURE AND CORE DIMENSIONS IN III – V COMPOUND CORE – SHELL NANOWIRES
ASHWANI VERMA,Bahniman Ghosh,AKSHAY KUMAR SALIMATH 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.4
In this paper, we have used semiclassical Monte Carlo method to show the dependence of spinrelaxation length in III – V compound semiconductor core – shell nanowires on di®erent parameterssuch as lateral electric ¯eld, temperature and core dimensions. We have reported the simulationresults for electric ¯eld in the range of 0.5 – 10 kV/cm, temperature in the range of 77 – 300 K andcore length ranging from 2 nm to 8 nm. The spin relaxation mechanisms used in III – V compoundsemiconductor core – shell nanowire are D'yakonov – Perel (DP) relaxation and Elliott – Yafet (EY)relaxation. Depending upon the choice of materials for core and shell, nanowire forms two types ofband structures. We have used InSb – GaSb core – shell nanowire and InSb – GaAs core – shellnanowire and nanowire formed by swapping the core and shell materials to show all the results.
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Monte Carlo simulation of spin relaxation in core-shell nanowires of dilute magnetic semiconductors
S. Sabiq Chishti,Bahniman Ghosh,Bhupesh Bishnoi 한국물리학회 2013 Current Applied Physics Vol.13 No.9
Spin transport behaviour in stand-alone and core-shell nanowire (NW) structure composed of dilutemagnetic semiconductor (DMS) has been analysed using Semi-classical Monte Carlo approach. Inspiredby recent attempts on exploring various factors instrumental in determining the spin dynamics, we haveemployed four DMS materials, namely, CdMnS, CdMnSe, ZnMnSe and CdMnTe for our study. Dominantmechanisms for spin relaxation, D’yakonov-Perel and Elliot-Yafet, have been actively employed in ourheuristic model to simulate the spin transport. The dependence of spin relaxation length (SRL) on thediameter of the core has been observed and explained. The first order calculations used to develop themodel shows the superiority of the core-shell structure over stand-alone nanowire (NW) structure interms of spin transport.
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