• 文献标题:   Tight-binding couplings in microwave artificial graphene
  • 文献类型:   Article
  • 作  者:   BELLEC M, KUHL U, MONTAMBAUX G, MORTESSAGNE F
  • 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:   Univ Nice Sophia Antipolis
  • 被引频次:   60
  • DOI:   10.1103/PhysRevB.88.115437
  • 出版年:   2013

▎ 摘  要

We experimentally study the propagation of microwaves in an artificial honeycomb lattice made of dielectric resonators. This evanescent propagation is well described by a tight-binding model, very much like the propagation of electrons in graphene. We measure the density of states, as well as the wave function associated with each eigenfrequency. By changing the distance between the resonators, it is possible to modulate the amplitude of next-(next-)nearest-neighbor hopping parameters and to study their effect on the density of states. The main effect is the density of states becoming dissymmetric and a shift of the energy of the Dirac points. We study the basic elements: an isolated resonator, a two-level system, and a square lattice. Our observations are in good agreement with analytical solutions for corresponding infinite lattice.