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arXiv 0908.3722cond-mat.supr-concond-mat.str-el
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超导涡旋晶格态Bogoliubov-de Gennes方程的研究方法

Method of studying the Bogoliubov-de Gennes equations for the superconducting vortex lattice state

Qiang Han

摘要:

本文提出了一种构造二维正方形晶格中垂直均匀磁场中运动的正常态电子的本征空间的方法,该磁场对磁单胞中的波函数施加了(准)周期边界条件。提出了一种精确的么正变换,将二维电子的离散本征矢量与Harper方程的本征矢量关联起来。与哈珀方程相关联的循环三对角矩阵,然后通过另一个酉变换三对角化。利用所得到的本征基展开超导涡旋晶格态的Bogoliubov-de Gennes方程,显示了该方法在研究大尺度系统时的优点.为了测试我们的方法,我们应用我们的结果来研究s波超导体的涡旋晶格态。

英文摘要:

In this paper, we present a method to construct the eigenspace of the normal-state electrons moving in a 2D square lattice in presence of a perpendicular uniform magnetic field which imposes (quasi)-periodic boundary conditions for the wave functions in the magnetic unit cell. An exact unitary transformations are put forward to correlate the discrete eigenvectors of the 2D electrons with those of the Harper's equation. The cyclic-tridiagonal matrix associated with the Harper's equation is then tridiagonalized by another unitary transformation. The obtained eigenbasis is utilized to expand the Bogoliubov-de Gennes equations for the superconducting vortex lattice state, which showing the merit of our method in studying the large-sized system. To test our method, we have applied our results to study the vortex lattice state of an s-wave superconductor.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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