Vortex charges in high-temperature superconductors.
Vortex charges in high-temperature superconductors.
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DOI：
10.1103/physrevlett.89.217001
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发表时间：
2002-06
影响因子：
8.6
通讯作者：
Yan Chen;Z. Wang;Jian-Xin Zhu;C. Ting
中科院分区：
文献类型：
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作者：
Yan Chen;Z. Wang;Jian-Xin Zhu;C. Ting
基于反铁磁（AF）和d波超导相互作用的模型哈密顿量，通过求解Bogoliubov-de Gennes方程研究了涡旋电荷。结果表明，当涡旋核心内部产生足够强度的AF阶时，涡旋电荷为负；否则，它是正的。通过调整现场库仑斥力U或掺杂参数delta，可以发生正、负涡旋电荷之间的转换。研究了最优掺杂时涡旋电荷随磁场的变化规律。最近的核磁共振和霍尔效应实验可以根据目前的结果来理解。
Based on a model Hamiltonian with competing antiferromagnetic (AF) and d-wave superconductivity interactions, the vortex charge is investigated by solving the Bogoliubov-de Gennes equations. We found that the vortex charge is negative when a sufficient strength of AF order is induced inside the vortex core; otherwise, it is positive. By tuning the on-site Coulomb repulsion U or the doping parameter delta, a transition between the positive and negative vortex charges may occur. The vortex charge at optimal doping has also been studied as a function of magnetic field. Recent NMR and Hall effect experiments may be understood in terms of the present results.