Invest Ligations of Electronic and Phonon Mediated Superconductivity of (Rb, K) Doped Graphene
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Date
2013-06
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Addis Ababa University
Abstract
We performed ab-initio calculations on a novel class of superconductors,
which comprise of alkali doped graphene. The graphene is doped wit h the potassium
and rubidium atoms. We theoretically studied lattice dynamics by performing
density functional perturbation t heory based simulations for studying doping effects
on graphene's phonon modes. Spectra of electronic and phonon density of states
are compared in between undoped and K and Rb doped graphene. Besides,
the study of electron-phonon int eractions is also performed and the signifi cant
amount of electron-phonon coupling is found to be present among the K and Rb
doped graphene. That is attributed as one of the reasons for as-found induced
superconductivity at certain crystal symmetry points of interest in Brillouin zone
of this material, specifically, at the (r and K) points. The higher values of electronphonon
coupli ngs of 0.3679 and 0.1907 correspondingly for the potassium and
rubidium doped graphene are found to be responsible for the superconductivity.
Nevertheless, during our calculations the el-ph coupling strengths for pristine
graphene is always found to be zero at various special points. In addi tion , the
prospects of the phenomena of su perconducti vi ty amongst the alkali doped graphene
are discussed in detail.
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Invest Ligations of Electronic