Orbital electronic heat capacity of hydrogenated monolayer and bilayer graphene

doi:10.1088/1674-1056/26/2/026502

Abstract The tight-binding Harrison model and Green's function approach have been utilized in order to investigate the contribution of hybridized orbitals in the electronic density of states (DOS) and electronic heat capacity (EHC) for four hydrogenated structures, including monolayer chair-like, table-like, bilayer AA- and finally AB-stacked graphene. After hydrogenation, monolayer graphene and bilayer graphene are behave as semiconducting systems owning a wide direct band gap and this means that all orbitals have several states around the Fermi level. The energy gap in DOS and Schottky anomaly in EHC curves of these structures are compared together illustrating the maximum and minimum band gaps are appear for monolayer chair-like and bilayer AA-stacked graphane, respectively. In spite of these, our findings show that the maximum and minimum values of Schottky anomaly appear for hydrogenated bilayer AA-stacked and monolayer table-like configurations, respectively.

Keywords: hydrogenated monolayer and bilayer graphene Harrison model electronic heat capacity density of states Green's function

Received: 12 October 2016
Revised: 11 November 2016
Accepted manuscript online:

PACS:	65.40.Ba	(Heat capacity)
	73.22.Pr	(Electronic structure of graphene)
	65.80.Ck	(Thermal properties of graphene)
	74.20.Pq	(Electronic structure calculations)

Corresponding Authors: Mohsen Yarmohammadi
E-mail: m.yarmohammadi69@gmail.com

Cite this article:

Mohsen Yarmohammadi Orbital electronic heat capacity of hydrogenated monolayer and bilayer graphene 2017 Chin. Phys. B 26 026502

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Orbital electronic heat capacity of hydrogenated monolayer and bilayer graphene

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