论文标题
在二维材料中有效的绑定电子对的有效质量，带有间隙带谱
Effective Mass of Bound Electron Pairs in Two-Dimensional Materials with a Gapped Band Spectrum
论文作者
论文摘要
由于晶体中电子的特征性的特征性而形成的绑定电子对引起了极大的关注，因为即使在没有带电导率的情况下，它们也可以携带电荷和旋转。然而，由于有效质量的界限，这是一个重要的结合对参数。我们对电子孔对称情况中的Bernevig-Hughes-Zhang模型描述的材料进行了这项研究，并在静止时找到了有效质量与结合对的能量之间的明确关系。质量对能量的依赖性对每种对成对的一种具有特定形式，但是一个共同的特征是当能量通过带间隙的中间时，质量标志的变化。当能量位于间隙的下半部分时，符号为负，并且上半部分为正。
Bound electron pairs formed due to the peculiarities of the band dispersion of electrons in crystals attract much interest because they can carry charge and spin even in the absence of band conductivity. However, such an important parameter of bound pairs as the effective mass is still poorly understood. We carry out this study for materials described by the Bernevig-Hughes-Zhang model in the electron-hole symmetric case and find a clear relationship between the effective mass and the energy of a bound pair at rest. The dependence of mass on energy has a specific form for each of different types of pairs, but a common feature is the change of the mass sign when energy passes through the middle of the band gap. The sign is negative when the energy is in the lower half of the gap, and positive in the upper half.
