Thermodynamics Properties and Optical Conductivity of Bipolaron in Graphene Nanoribbon Under Laser Irradiation

In this work, we are studying thermodynamics properties and optical absorption of bipolaron in graphene under a laser field using the variational method. We obtain the ground and first excited states of the bipolaron which strongly depend on laser parameter and graphene characteristics. It is seen that the optical absorption of a bipolaron in graphene depends strongly on the laser parameter. We observed that laser reduces the absorption of photons by laser. The latter also reinforces the electron–electron bound state in graphene leading to its strong energy storage capabilities. Our results show that the electron–electron interaction and laser parameters are important to control the disorder of the system. Due to its intensity and frequency, laser contribution is highest on the entropy, internal energy and specific heat, while the contribution of phonon modes is minimum on these thermodynamics properties suggesting the importance of laser on graphene structures. The results obtained are efficient because bipolaron is well formed and stable in graphene. This investigation may enlighten the understanding of the charge transport mechanism in graphene nanomaterials.