NDLI: Spin Transport in Bilayer Graphene Armchair Nanoribbon: A Monte Carlo Simulation Study

Content Provider	IEEE Xplore Digital Library
Author	Salimath, A. Ghosh, B.
Copyright Year	1963
Abstract	In this paper, we study the spin relaxation in bilayer armchair graphene nanoribbons (acGNRs) by employing the semiclassical Monte Carlo approach. D'yakonov-Perel relaxation due to structural inversion asymmetry (Rashba spin-orbit coupling) and Elliott-Yafet relaxation cause spin dephasing in bilayer GNRs. We investigate the spin relaxation in bilayer α-, β-, and γ-acGNRs with varying their width and the temperature. We consider injection polarization along the z-direction, which is perpendicular to the plane of grapheme, and study the magnitude of ensemble-averaged spin variation along the x-direction which is the transport direction. To the best of our knowledge, there has been no Monte Carlo simulation performed on spin transport in acGNRs. We investigate the role of various scattering events in spin relaxation in bilayer acGNRs. We find that the spin relaxation length in the α-acGNR is 6.5% higher than in β-acGNR and 10.8% higher than in γ-acGNR at 300 K. We also report the results of the variation of spin relaxation length with varying temperatures. We find that the spin relaxation length decreases by 9% in α-acGNR, by 10.5% in β-acGNR, and 11% in γ-ac GNR at 300 K compared to 4 K. The decrease in spin relaxation length at the higher temperature is due to the increase in phonon and spin-flip scattering rates at the higher temperature. This theoretical investigation is particularly important to identify the factors responsible for the experimentally observed spin relaxation length in GNRs.
Sponsorship	IEEE Electron Devices Society
Starting Page	3734
Ending Page	3740
Page Count	7
File Size	922675
File Format	PDF
ISSN	00189383
Volume Number	60
Issue Number	11
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Scattering Graphene Vectors Monte Carlo methods Phonons Photonic band gap Temperature spin transport Bilayer armchair graphene nanoribbon Monte Carlo method scattering spin relaxation lengths
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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