Dynamic Approach to the Ground State of a Vortex System with Random Pinning

• 来源期刊: 中国物理快报（英文版）
• 学科: 物理学
• 年，卷（期）: 2001,（4）
• 所属期刊栏目: CONDENSED MATTER：ELECTRONIC STRUCTURE，ELECTRICAL
• 页码范围: 584-586
• 页数: 3页
• 分类号: O4
• 语种: 英文

摘要

We study the ground state of a two-dimensional vortex system with random pinnings by cooling the vortex systemto zero temperature. The peak of structure factor S(k) of vortices increases with vortex density B but decreaseswith pin density Bφ, indicating that the vortex lattice becomes better and better ordered with increasing B.When B ＞ Bφ, the triangular vortex lattice is observed away from the pins. Repulsive vortex interactionsdestroy the Mott insulator phase which is predicted to occur at B = Bφ. The crossover line between the strongBose glass and the weak Bos glass is nearly independent of Bφ for small Bφ.