论文标题
dirac在石墨烯中的$ g $ factor各向异性
Dirac imprints on the $g$-factor anisotropy in graphene
论文作者
论文摘要
由于费米水平的轨道对称性，石墨烯中的狄拉克电子的旋转1/2颗粒的最低。但是，由于手性电子的复杂自旋 - 瓦利 - 轨道耦合，出现了$ g $因子中的各向异性校正。我们通过大规模石墨烯样本中的三个正交方向来实验解决$ g $ factor。我们采用带有任意方向的外部磁场的霍尔杆结构，并通过电阻检测的电子自旋共振提取有效的$ g $ tensor。我们采用一种理论扰动方法来识别固有和外部的旋转轨道耦合，并获得$^{12} $ C的原子结构固有的基本参数，该参数是Ab-Initio模型中常用的。
Dirac electrons in graphene are to lowest order spin 1/2 particles, owing to the orbital symmetries at the Fermi level. However, anisotropic corrections in the $g$-factor appear due to the intricate spin-valley-orbit coupling of chiral electrons. We resolve experimentally the $g$-factor along the three orthogonal directions in a large-scale graphene sample. We employ a Hall bar structure with an external magnetic field of arbitrary direction, and extract the effective $g$-tensor via resistively-detected electron spin resonance. We employ a theoretical perturbative approach to identify the intrinsic and extrinsic spin orbit coupling and obtain a fundamental parameter inherent to the atomic structure of $^{12}$C, commonly used in ab-initio models.
