Vortices of mesoscopic rings in an external magnetic field: Phenomenological Ginzburg-Landau theory

Vortices of mesoscopic rings in an external magnetic field: Phenomenological Ginzburg-Landau theory
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外部磁场中介观环的涡旋:唯象金兹堡-朗道理论

DOI:
10.1103/physrevb.79.184518
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发表时间:
2009-05
期刊:
影响因子:
3.7
通讯作者:
Shi, Liang-Ma
Shi, Liang-Ma
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Meng, Hao;Zhang, Ling-Feng;Zhou, Shi-Ping;Zha, Guo-Qiao;Zhao, Hong-Wei;Shi, Liang-Ma

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在存在外部施加磁场的情况下,通过唯象金兹堡-朗道理论研究了介观超导环中的涡旋态。我们通过求解特征值问题并最小化系统自由能获得圆柱对称巨涡态(GVS)。随着系统尺寸和磁场的变化,会发现 GVS 和多涡旋态之间的基态转变。揭示了与量子尺寸效应和邻近效应相关的亚稳态和负通量跳跃。此外,我们发现随着外场的增加,超导态和常态可以交替出现。
Vortex states in mesoscopic superconducting rings are investigated by the phenomenological Ginzburg-Landau theory in the presence of an externally applied magnetic field. We obtain the cylindrical symmetric giant vortex states (GVS) by solving an eigenvalue problem and minimizing the system free energy. Ground state transitions between GVS and multivortex states are found as system dimensions and magnetic field vary. Metastability and negative flux jump associated with quantum size effect and proximity effect are revealed. Also, We find that the superconducting state and the normal state can alternately appear with external field increasing.
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