Symmetry-driven novel Kondo effect in a molecule

Emi Minamitani, Noriyuki Tsukahara, Daisuke Matsunaka, Yousoo Kim, Noriaki Takagi, Maki Kawai

    Research output: Contribution to journalArticlepeer-review

    108 Citations (Scopus)

    Abstract

    The Kondo effect caused by the adsorption of iron phthalocyanine (FePc) on Au(111) was investigated by the combination of density functional theory and a numerical renormalization group calculation with scanning tunneling microscopy. We found that a novel Kondo effect is realized for a single FePc molecule on Au(111) by tuning the symmetry of the ligand field through the local coordination to the substrate. For FePc in the on top configuration where fourfold symmetry around the Fe2 + ion is held, the orbital degrees of freedom survive, resulting in the spin+orbital SU(4) Kondo effect. In contrast, the reduced symmetry in the bridge configuration freezes the orbital degrees of freedom, leading to the spin SU(2) Kondo effect. These results provide a novel example to manipulate the many-body phenomena by tuning the local symmetry.

    Original languageEnglish
    Article number086602
    JournalPhysical review letters
    Volume109
    Issue number8
    DOIs
    Publication statusPublished - 2012 Aug 22

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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