Electron Scattering In Graphene By Electric And Magnetic Dipole

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The two-dimensional form of graphite (graphene) has been obtained only very re-rncently, and immediately attracted great deal of attention. Electrons in graphene,rnobeying linear dispersion relation, behave like massless relativistic particles. It is be-rnlieved that graphene can replace silicon in electronics world. But the biggest obstaclernis that graphene itself does not have a band gap. This property makes graphenernalways conducting and conduction can not be completely turned o . One of thernmost challenging task is to learn how to control the electron behavior using electricrn elds in this two-dimensional layer. In this work we wanted to learn (and to proposernmechanisms) "How to control the electron motion in graphene using magnetic dipolernand electric dipole?". The second idea was to investigate if it is possible to use mag-rnnetic elds of large suspended nanomagnet to open a gap in the energy spectrum ofrngraphene.rnThe elastic electron scattering by impurities with electric and magnetic dipoles inrngraphene is studied with the help of Born approximation. Both types of scatterersrngive the nonzero cross section of backscattering. The scattering by the impurities withrnelectric dipoles is more efcient even comparing to the scattering by the nanomagnetsrnwith anomalous magnetic moments. A comparison of the electron scattering transportrncross sections by charged impurities and impurities with electric dipole momentsrnshows that they can be comparable. The scattering by the impurities electric dipolesrncan be important in limiting the electron mobility in graphene along with the Coulombrnscattering.rnxiirnxiiirnThe elastic electron scattering by a nonuniform magnetic eld of a remote nano-rnmagnets in the graphene is also considered with the help of the modied Born ap-rnproximation. The nanomagnets are modeled by point like magnetic dipoles orientedrntransversally and parallel to the graphene plane. They can form rather high magneticrnelds without any damage of the graphene plane. The electron scattering cross sectionsrnare obtained in the closed form and analyzed numerically. It is shown that this mech-rnanism of scattering has nonzero backscattering cross section and can considerablyrna ect the graphene conductivity

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Electron Scattering In Graphene By Electric And Magnetic Dipole

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