论文标题
狄拉克载体的角动量各向异性：石墨烯的新扭曲
Angular momentum anisotropy of Dirac carriers: A new twist in graphene
论文作者
论文摘要
石墨烯中的狄拉克携带者通常以伪短信的自由程度为特征，这是由于两个不相等的sublattices的堕落而引起的。准粒子的固有手性导致拓扑非平凡的条带结构，其中sublattice旋转和动量的平面成分交织在一起。同等地，Sublatice失衡与角动量密切相关，在每个狄拉克点诱导了相反的符号扭矩。在这项工作中，我们开发了一张直观的图片，该图片将Sublattice旋转和蜿蜒数量与角动量相关联。我们开发一个微观扰动模型，以获得沿主要晶体学方向的有限角动量贡献。我们的结果可以用于确定蜂窝双分裂结构中G因子和光吸收的角度依赖性。
Dirac carriers in graphene are commonly characterized by a pseudospin degree of freedom, arising from the degeneracy of the two inequivalent sublattices. The inherent chirality of the quasiparticles leads to a topologically non-trivial band structure, where the in-plane component of sublattice spin and momentum are intertwined. Equivalently, sublattice imbalance is intimately connected with angular momentum, inducing a torque of opposite sign at each Dirac point. In this work we develop an intuitive picture that associates sublattice spin and winding number with angular momentum. We develop a microscopic perturbative model to obtain the finite angular momentum contributions along the main crystallographic directions. Our results can be employed to determine the angular dependence of the g-factor and of light absorption in honeycomb bipartite structures.
