“School of Physic”
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| Paper IPM / Physic / 13874 |
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| Abstract: | |||||
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The two-sublattice nature of graphene lattice in conjunction with three-fold rotational
symmetry, allows for the p-wave hybridization of the impurity state with the Bloch states of
carbon atoms. Such an opportunity is not available in normal metals where the wave function
is scalar. The p-wave hybridization function V(→k) appears when dealing with vacancies,
substitutional adatoms and the hollow site impurities while the s-wave mixing on graphene
lattice pertains only to the top site impurities. In this work, we compare the local moment
formation in these two cases and find that the local moments formed by p-wave mixing
compared to the s-wave one are robust against the changes in the parameters of the model.
Furthermore, we investigate the stability of the local moments in the above cases. We find that
the quantum fluctuations can destroy the local moments in the case of s-wave hybridization,
while the local moments formed by p-wave hybridization survive the quantum fluctuations.
Based on these findings, we propose vacancies, substitutional adatoms, and hollow site
adatoms as possible candidates to produce stable local moments in graphene.
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