title: Effects of spin-orbit coupling and many-body correlations in STM transport through copper phthalocyanine.
abstract: The interplay of exchange correlations and spin-orbit interaction (SOI) on the many-body spectrum of a copper phtalocyanine (CuPc) molecule and their signatures in transport are investigated. We first derive a minimal model Hamiltonian in a basis of frontier orbitals that is able to reproduce experimentally observed singlet-triplet splittings. In a second step SOI effects are included perturbatively. Major consequences of the SOI are the splitting of former degenerate levels and a magnetic anisotropy, which can be captured by an effective low-energy spin Hamiltonian. We show that scanning tunneling microscopy-based magnetoconductance measurements can yield clear signatures of both these SOI-induced effects.
authors.affiliation: Institut für Theoretische Physik, Universität Regensburg, D-93040, Germany.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Siegert
authors.affiliation: Institut für Theoretische Physik, Universität Regensburg, D-93040, Germany.
authors.forename: Andrea
authors.initials: A
authors.lastname: Donarini
authors.affiliation: Institut für Theoretische Physik, Universität Regensburg, D-93040, Germany.
authors.forename: Milena
authors.initials: M
authors.lastname: Grifoni
keywords: anisotropy; copper phthalocyanine; magnetotransport; scanning tunneling microscopy (STM); spin–orbit interaction