Please use this identifier to cite or link to this item: https://doi.org/10.1063/1.3457353
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dc.titleMagnetoresistive effect in graphene nanoribbon due to magnetic field induced band gap modulation
dc.contributor.authorKumar, S.B.
dc.contributor.authorJalil, M.B.A.
dc.contributor.authorTan, S.G.
dc.contributor.authorLiang, G.
dc.date.accessioned2014-10-07T04:32:02Z
dc.date.available2014-10-07T04:32:02Z
dc.date.issued2010-08-01
dc.identifier.citationKumar, S.B., Jalil, M.B.A., Tan, S.G., Liang, G. (2010-08-01). Magnetoresistive effect in graphene nanoribbon due to magnetic field induced band gap modulation. Journal of Applied Physics 108 (3) : -. ScholarBank@NUS Repository. https://doi.org/10.1063/1.3457353
dc.identifier.issn00218979
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/82664
dc.description.abstractThe electronic properties of armchair graphene nanoribbons (AGNRs) can be significantly modified from semiconducting to metallic states by applying a uniform perpendicular magnetic field (B-field). Here, we theoretically study the band gap modulation induced by a perpendicular B-field. The applied B-field causes the lowest conduction subband and the topmost valence subband to move closer to one another to form the n=0 Landau level. We exploit this effect to realize a device relevant magnetoresistive (MR) modulation. Unlike in conventional spin-valves, this intrinsic MR effect is realized without the use of any ferromagnetic leads. The AGNRs with number of dimers, Na=3p+1 [p=1,2,3,...] show the most promising behavior for MR applications with large conductance modulation, and hence, high MR ratio at the optimal source-drain bias. However, the MR is suppressed at higher temperature due to the spread of the Fermi function distribution. We also investigate the importance of the source-drain bias in optimizing the MR. Lastly, we show that edge roughness of AGNRs has the unexpected effect of improving the magnetic sensitivity of the device and thus increasing the MR ratio. © 2010 American Institute of Physics.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1063/1.3457353
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentELECTRICAL & COMPUTER ENGINEERING
dc.description.doi10.1063/1.3457353
dc.description.sourcetitleJournal of Applied Physics
dc.description.volume108
dc.description.issue3
dc.description.page-
dc.description.codenJAPIA
dc.identifier.isiut000280941000053
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