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임국형 ( Gukhyung Ihm ) 충남대학교 기초과학연구원 2018 충남과학연구지 Vol.35 No.1
We present the thermal expansion coefficient of Fermi gas in graphene. We use the Sommerfeld expansion method to obtain the heat capacity and the relation between chemical potential and electron density, which are crucial in determining the thermal expansion coefficient. As a result, in contrast to ordinary two dimensional electron systems, the compressibility of graphene has been shown to have non-linear temperature dependence. The possibility of negative thermal expansion coefficient are also discussed in accordance with recent experiments.