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Singapore University of Technology and Design

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(a) The energy band structure illustrating the thermionic emission process of electrons in graphene at different energy states; (b) Low-energy band structure of graphene under the Dirac cone approximation; (c) More general energy band structure of graphene covering both low and high energy regime; (d) Large discrepancy between the electronic density of states predicted by the band structure theory in (b) and in (c).

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SUTD

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