Mechanical properties graphene nanoribbons

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Hi
In calculation the mechanical properties of graphene nanoribbons by tight binding methods should band structure graphene calculated by the DFT and tight binding methods fitted to calculate b parameter. In the tight binding methods hopping parameter changes as follow:
t'_{ppsigma}=t_{ppsigma} exp(-b{l/a0 - 1)) .
Can help me for calculate b??
 

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