Tight binding for graphene pz orbital

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Avinash Vikat
Can anyone explain what is tight binding method . I don't understand much .for solids mostly for graphene with one atom per site
 

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Tight binding is the term solid state physicists use to call what chemists call LCAO method. In the case of graphene, if they only consider the pz, this is equivalent to the Hueckel method, or, if some correlation is taken into account, the Pariser Parr Pople method (PPP), which they tend to call the Hubbard model.
 

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