Browsing by Author "Swain R."
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Item The tight-binding model study of the role of electron occupancy on the ferromagnetic gap in graphene-on-substrate(2019) Swain R.; Sahu S.; Rout G.C.We propose here a theoretical model for graphene in its ferromagnetic phase. The Hamiltonian describes electron hoppings up-to-third-nearest neighbours for graphene-on-substrate. The sub-lattice coulomb interactions within mean-field approach involve the total electron occupancy and ferromagnetic magnetisations (FMs). The temperature dependent ferromagnetic magnetisation and hence, the ferromagnetic gap are derived from the electron Green�s functions and are solved self-consistently. The result shows that the magnitude of the ferromagnetic gap and the critical coulomb interaction strongly depend on total electron occupancy. The critical coulomb interaction decreases with increase of electron occupancy and the vice-versa. Copyright � 2019 Inderscience Enterprises Ltd.Item Tight-Binding Theoretical Study of the Tunneling Conductance in Ferromagnetically Ordered Graphene-on-Substrate(2018) Swain R.; Sahu S.; Rout G.C.We report here a tight-binding theoretical study of the tunneling conductance and temperature dependent specific heat of graphene-on-substrate. The Hamiltonian consists of the electron hoppings up to third nearest neighbors in the presence of doping and on-site Coulomb interactions at two sub-lattices of honey-comb lattice. The total Hamiltonian is solved by Zubarev Green�s functions technique. Then, the sub-lattice magnetizations, tunneling conductance, and specific heat are calculated from the Green�s functions and are computed numerically. The effect of impurity, substrate induced gap, and repulsive Coulomb potential on tunneling conductance is discussed. The anomaly in specific heat at low temperatures is described. � 2017, Springer Science+Business Media, LLC, part of Springer Nature.