Nonclassical correlations in two-dimensional graphene lattices

Abstract

We investigate the nonclassical correlations via negativity (N), local quantum uncertainty (LQU) and local quantum Fisher information (LQFI) for the two-dimensional Graphene lattices. The explicitly analytical expressions of the negativity, LQU and LQFI are given. The close forms of the LQU and LQFI confirm the inequality between the quantum Fisher information and skew information, where the LQFI is always greater than or equal to the LQU, and both of them show very similar behavior with different amplitudes. Moreover, the effects of the different system parameters on the quantified quantum correlation are analyzed. The LQFI reveals more nonclassical correlations than LQU in a two-dimensional Graphene lattice system.