What is relation between the graphene chemical potential and external bias voltage in THz spectrum?

01 January 1970 0 2K Report

According to my searches, I found a relation between graphene gate voltage and chemical potential as I have attached here in a picture.

uc = h' * Vf * sqrt( pi*e0*er* Vg/ eh)

My issue is that I can not set constance. Which value with which unit can satisfy the above equation? Or is that equation right?

Looking for help.

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