• 文献标题:   Molecular collapse in monolayer graphene
  • 文献类型:   Article
  • 作  者:   VAN POTTELBERGE R, MOLDOVAN D, MILOVANOVIC SP, PEETERS FM
  • 作者关键词:   atomic collapse, graphene, electronic structure, molecular collapse
  • 出版物名称:   2D MATERIALS
  • ISSN:   2053-1583
  • 通讯作者地址:   Univ Antwerp
  • 被引频次:   2
  • DOI:   10.1088/2053-1583/ab3feb
  • 出版年:   2019

▎ 摘  要

Atomic collapse is a phenomenon inherent to relativistic quantum mechanics where electron states dive in the positron continuum for highly charged nuclei. This phenomenon was recently observed in graphene. Here we investigate a novel collapse phenomenon when multiple sub- and supercritical charges of equal strength are put close together as in a molecule. We construct a phase diagram which consists of three distinct regions: (1) subcritical, (2) frustrated atomic collapse, and (3) molecular collapse. We show that the single impurity atomic collapse resonances rearrange themselves to form molecular collapse resonances which exhibit a distinct bonding, anti-bonding and non-bonding character. Here we limit ourselves to systems consisting of two and three charges. We show that by tuning the distance between the charges and their strength a high degree of control over the molecular collapse resonances can be achieved.