Influence of doping on superconducting states of single-layer graphene.
An increase in the number of studies involving graphene has been notable in the recent decades, mainly due its two-dimensional structure and also for the varied applications in technological devices. Superconductivity has been observed in different materials when placed under very-low temperature...
| Autor principal: | Pinto, Yan Matheus Colares |
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| Outros Autores: | http://lattes.cnpq.br/0587684254993109 |
| Grau: | Dissertação |
| Idioma: | eng |
| Publicado em: |
Universidade Federal do Amazonas
2022
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| Assuntos: | |
| Acesso em linha: |
https://tede.ufam.edu.br/handle/tede/8866 |
| Resumo: |
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An increase in the number of studies involving graphene has been notable in the recent
decades, mainly due its two-dimensional structure and also for the varied applications in technological
devices. Superconductivity has been observed in different materials when placed under
very-low temperatures, which motivated us to the study the different phases of the superconducting
states in the honeycomb lattice structure of graphene.
In this work we consider pure two-dimensional single-layer graphene on a honeycomb lattice.
A tight-binding model of the electrons and their energy bands in the first Brillouin zone
described by the linear dispersion of the Dirac fermions is used to describe the graphene in its
pure form. We study the superconducting phases of the graphene using a mean field theory to
calculate the temperature dependencies of the order parameters and also the specific heat of
the system below the critical temperature.
Conciling this states of matter applied to graphene and considering doping effects we analized
the phases states for attractive electron-electron interactions energies.
We get in addition to the usual s-wave, an exotic possibility appears in the form of a
symmetric p+ip wave due to the symmetry structure around the Dirac points. The coexistence
of the above two phases has been of utmost importance for our study. Hence the characteristic
graphs of the order parameter and specific heat in the variation of the chemical potential are
studied. |