KEMUNGKINAN WATAK KETIDAKSTABILAN SUPERKONDUKTIVITAS ANTAR LEMBARAN GRAPHENE DENGAN UNTIRAN; POSSIBILITY OF SUPERCONDUCTIVITY INSTABILITIES IN TWISTED GRAPHENE LAYERS

MUHAMAD NASRUDDIN MANAF, Iman Santoso

2014 | Disertasi | PROGRAM STUDI S2 ILMU FISIKA

We discuss the possibility of superconductivity in twisted Graphene layers. Twisted Bilayer Graphene is used for this model with commensurate rotation ? ?1,160 , in which the van-Hove singularites arise 6 meV from the Fermi level. BCS standard formula which included Density of States (DOS) are used to calculate the critical temperature. Based on our calculation we predict that superconductivity never arise in Pristine Twisted Bilayer Graphene. Dirac Fermions do not interact each other. Superconducitvity may arise when the Fermi level is shifted towards the van-Hove singularites using gate voltage. Based on this calculation, we predict the superconducting critical temperature between 0,04 K until 0,12 K. The low critical temperature caused by highly energetic of in plane phonon vibration, reducing the effective electron-phonon coupling. We conclude that Twisted Bilayer Graphene is candidate for Dirac Fermion superconductor

Kata Kunci : WATAK; KETIDAKSTABILAN; SUPERKONDUKTIVITAS; LEMBARAN GRAPHENE; UNTIRAN