title: Spin-Dependent Molecule Symmetry at a Pentacene-Co Spinterface.
abstract: Incorporating spin-polarized scanning tunneling microscopy (SP-STM) measurements and first-principles calculations, we resolve spin-polarized states and consequent features in a pentacene(PEN)-Co hybrid system. Symmetry reduction of PEN clarifies the PEN adsorption site and the Co stacking methods. Near the Fermi energy, the molecular symmetry is spin-dependently recovered and an inversion of spin-polarization in PEN with respect to Co is observed. The experimental findings and calculation results are interpreted by a pz-d hybridization model, in which spin-dependent bonding-antibonding splitting of molecular orbitals happens at metal-organic spinterfaces.
authors.affiliation: †Department of Physics, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Yu-Hsun
authors.initials: YH
authors.lastname: Chu
authors.affiliation: †Department of Physics, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Chuang-Han
authors.initials: CH
authors.lastname: Hsu
authors.affiliation: †Department of Physics, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Chun-I
authors.initials: CI
authors.lastname: Lu
authors.affiliation: †Department of Physics, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Hung-Hsiang
authors.initials: HH
authors.lastname: Yang
authors.affiliation: †Department of Physics, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Tsung-Han
authors.initials: TH
authors.lastname: Yang
authors.affiliation: †Department of Physics, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Chi-Hung
authors.initials: CH
authors.lastname: Luo
authors.affiliation: †Department of Physics, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Kai-Jheng
authors.initials: KJ
authors.lastname: Yang
authors.affiliation: †Department of Physics, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Shih-Hao
authors.initials: SH
authors.lastname: Hsu
authors.affiliation: †Department of Physics, National Taiwan University, Taipei 10617, Taiwan.|‡Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan.
authors.forename: Germar
authors.initials: G
authors.lastname: Hoffmann
authors.affiliation: ‡Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan.|§Research Center for Applied Sciences, Academia Sinica, Taipei 11529, Taiwan.
authors.forename: Chao-Cheng
authors.initials: CC
authors.lastname: Kaun
authors.affiliation: †Department of Physics, National Taiwan University, Taipei 10617, Taiwan.|⊥Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan.
authors.forename: Minn-Tsong
authors.initials: MT
authors.lastname: Lin
keywords: cobalt island; first-principles calculation; molecular symmetry; organic-metal hybridization; pentacene; spin-polarized scanning tunneling spectroscopy; spinterface