• 文献标题:   Interaction effects in a chaotic graphene quantum billiard
  • 文献类型:   Article
  • 作  者:   HAGYMASI I, VANCSO P, PALINKAS A, OSVATH Z
  • 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:   MTA Wigner Res Ctr Phys
  • 被引频次:   8
  • DOI:   10.1103/PhysRevB.95.075123
  • 出版年:   2017

▎ 摘  要

We investigate the local electronic structure of a Sinai-like, quadrilateral graphene quantum billiard with zigzag and armchair edges using scanning tunneling microscopy (STM) at room temperature. It is revealed that besides the (root 3x root 3) R30 degrees superstructure, which is caused by the intervalley scattering, its overtones also appear in the STM measurements, which are attributed to the Umklapp processes. We point out that these results can be well understood by taking into account the Coulomb interaction in the quantum billiard, accounting for both the measured density of state values and the experimentally observed topography patterns. The analysis of the level-spacing distribution substantiates the experimental findings as well. We also reveal the magnetic properties of our system which should be relevant in future graphene based electronic and spintronic applications.