• 文献标题:   Magnetic Correlations in Short and Narrow Graphene Armchair Nanoribbons
  • 文献类型:   Article
  • 作  者:   GOLOR M, KOOP C, LANG TC, WESSEL S, SCHMIDT MJ
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW LETTERS
  • ISSN:   0031-9007
  • 通讯作者地址:   Rhein Westfal TH Aachen
  • 被引频次:   17
  • DOI:   10.1103/PhysRevLett.111.085504
  • 出版年:   2013

▎ 摘  要

Electronic states at the ends of a narrow armchair nanoribbon give rise to a pair of nonlocally entangled spins. We propose two experiments to probe these magnetic states, based on magnetometry and tunneling spectroscopy, in which correlation effects lead to a striking, nonlinear response to external magnetic fields. On the basis of low-energy theories that we derive here, it is remarkably simple to assess these nonlinear signatures for magnetic edge states. The effective theories are especially suitable in parameter regimes where other methods such as quantum Monte Carlo simulations are exceedingly difficult due to exponentially small energy scales. The armchair ribbon setup discussed here provides a promisingly well-controlled (both experimentally and theoretically) environment for studying the principles behind edge magnetism in graphene-based nanostructures.