期刊
PHYSICAL REVIEW B
卷 79, 期 23, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.233402
关键词
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资金
- NAS of Ukraine
- Department of Energy [DOE-DEFG02-]
In this Brief Report, we analyze the superconducting properties of doped single-and double-layer graphene systems by taking into account the fluctuations of the superconducting order parameter. Our analysis is rather general, and corresponds to a phenomenological electron-electron (hole-hole) attraction defined by its strength and range, and is independent of the origin of attraction. We show that in this model, similar to the case of two-dimensional doped metal, the thermal fluctuations of the order-parameter result in a significant reduction in the Berezinskii-Kosterlitz-Thouless critical temperature T-c comparing to the mean-field temperature T-c(MF), and there is a pseudogap phase with a suppressed density of states at temperature range T-c < T < T-c(MF). At low doping n(f), the critical temperature is proportional to n(f) in the double-layer case, and it is exponentially suppressed in the case of a single layer.
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