石墨中Lifshitz相变附近的回旋运动
Cyclotron motion in the vicinity of a Lifshitz transition in graphite
摘要：
用磁吸收实验研究了具有三角弯曲带的模型（半）金属石墨，并将其看作是一个处于Lifshitz跃迁附近的电子系统。已观察到多达20个回旋共振谐波的特征图案。这些大量的共振，它们的相对强度和特征形状，在动量空间的分界线附近追踪了电子态的普适性质。量子力学微扰方法与三角形翘曲项很难描述的数据，另一方面，相当好地再现内的准经典的方法和传统的能带结构模型。与双层石墨烯类似的系统相比，石墨中保留了三角对称性。
英文摘要：
Graphite, a model (semi)metal with trigonally warped bands, is investigated with magneto-absorption experiment and viewed as an electronic system in the vicinity of the Lifshitz transition. A characteristic pattern of up to twenty cyclotron resonance harmonics has been observed. This large number of resonances, their relative strengths and characteristic shapes trace the universal properties of the electronic states near a separatrix in the momentum space. Quantum-mechanical perturbative methods with respect to the trigonal warping term hardly describe the data which are, on the other hand, fairly well reproduced within a quasi-classical approach and conventional band structure model. Trigonal symmetry is preserved in graphite in contrast to a similar system, bilayer graphene.
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