中文摘要：

从GL（Ginzburg-Landau）自由能出发,在最低朗道能级近似下,用蒙特卡罗的方法模拟了二维无序第二类超导体涡旋态系统。对于纯净的涡旋系统,得到了从涡旋固态到涡旋液态的一级相变,验证了前人的理论。对于无序的涡旋系统,发现低温区域存在Bragg玻璃态。

英文摘要：

Based on the Ginzburg-Landau model,using lowest Landau level approximation,Monte Carlo simulations are performed to investigate the vortex phase in type II two-dimension superconductors.For the clean system,the first order phase transition from vortex solid to vortex liquid is obtained,which is in agreement with previous works in the literature.In contrast,for the weak disorder system,the Bragg glass phase is observed.