• 文献标题:   Angular momentum anisotropy of Dirac carriers: A new twist in graphene
  • 文献类型:   Article
  • 作  者:   PRADA M
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW B
  • ISSN:   2469-9950 EI 2469-9969
  • 通讯作者地址:  
  • 被引频次:   4
  • DOI:   10.1103/PhysRevB.103.115425
  • 出版年:   2021

▎ 摘  要

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 nontrivial band structure, where the in-plane components 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.