Abstract
We study a possible superconducting phase transition, both in a graphene bilayer and in graphite, by assuming an on-site attractive interaction between the electrons. We consider a stack of graphene layers with hopping between adjacent sheets, derive an expression for the free-energy (effective potential) of this system and determine the superconducting critical temperature as a function of the chemical potential. This presents a dome-shaped curve characteristic of several layered materials. We show that the hopping between adjacent layers increases the critical temperature (Tc) for small values of the chemical potential (μ) and produces a finite Tc at μ=0. Physically, this can be ascribed to the formation of a Fermi surface for a finite interlayer hopping. We then extend our results to a minimal model for graphite and show that the transition temperature is higher than that for the graphene bilayer for small values of chemical potential. This might explain why intrinsic superconductivity is observed in graphite.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
