Electron band structure in a two-dimensional periodic magnetic field.
Electron band structure in a two-dimensional periodic magnetic field.
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DOI：
10.1103/physrevb.50.10843
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发表时间：
1994-10
期刊：
影响因子：
--
通讯作者：
Chang;Niu
中科院分区：
文献类型：
--
作者：
Chang;Niu
本文研究了二维周期磁场中二维电子气的能谱。同时考虑了正方形磁性晶格和三角形磁性晶格。我们考虑单胞中磁场可以是任何形状的一般情况。能带结构的一个一般特征是带宽振荡作为朗道指数的函数。二维EG上的三角形磁性晶格可以通过覆盖在异质结上的超导薄膜的涡旋晶格来实现。我们的计算表明了一种将二维EG的能谱与涡旋结构联系起来的方法。我们还导出了弱磁调制的效应，无论是周期性的还是非周期性的，都可以通过电势调制再现的条件，反之亦然。
In this paper we study the energy spectrum of a two-dimensional electron gas (2DEG) in a two-dimensional periodic magnetic field. Both a square magnetic lattice and a triangular one are considered. We consider the general case where the magnetic field in a cell can be of any shape. A general feature of the band structure is bandwidth oscillation as a function of the Landau index. A triangular magnetic lattice on a 2DEG can be realized by the vortex lattice of a superconductor film coated on top of a heterojunction. Our calculation indicates a way of relating the energy spectrum of the 2DEG to the vortex structure. We have also derived conditions under which the effects of a weak magnetic modulation, periodic or not, may be reproduced by an electric potential modulation, and vice versa.