中文摘要：

研究外磁场中二维荷电费密气体的磁学性质,引入Lande因子g度量顺磁效应的强度.结果表明随着g的增大,系统发生由抗磁性向顺磁性的转变,并讨论了发生抗磁与顺磁转变时Lande因子的临界值gc对温度的依赖行为.得到的关于二维荷电费密气体的磁学性质与三维荷电费密气体的相应结果相似.

英文摘要：

Magnetic properties of two-dimensional charged Fermi gas was studied by mean-field theory. The paramagnetic effect was evaluated by Lande-factor g. With increasing g, the system presented a transition from diamagnetism to paramagnetism. The critical value of g-factor, go, which separates diamagnetic from paramagnetic regions, was also discussed, especially the dependence of gc on temperature. Our results showed that two-dimensional Fermi gases presented magnetic properties similar to three-dimensional systems.