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The continuous tuning of the emission (absorption) spectra of the excitons in graphene field-effect transistors by the gate (drain) voltage is of great technological significance. And its physical mechanism still remains to be unraveled. A new physical model of the electric field dependent exciton energy and its impacts on the emission (absorption) spectra is proposed based on the ambipolar transport...
The characteristics of field-emission current of a graphene nanoribbon along the direction without finite size effect in the graphene sheet have been theoretically studied. After the work function of graphene nanoribbon is assumed not to change with its width, numerical calculations show that field-emission current density at a given external field decreases with decreasing width of nanoribbon. Such...
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