Low-energy physics for an iron phthalocyanine molecule on Au(111)

Abstract

The system of an iron phthalocyanine molecule on the Au(111) surface, has been studied recently due to its peculiar properties. In particular, several surprising results of scanning tunneling spectroscopy changing the position of the molecule and applying magnetic field can be explained by the {\it non-Landau} Fermi liquid state of a 2-channel spin-1 Kondo model with anisotropy. The localized orbitals near the Fermi level are three, one of symmetry $z^2$ and two (nearly) degenerate $\pi$ orbitals of symmetry $xz$ and $yz$. Previous studies using the numerical renormalization group neglected one of these orbitals to render the problem tractable. Here we investigate, using a slave-boson mean-field approximation, if the splitting $S$ between $\pi$ orbitals caused by spin-orbit coupling (SOC) justifies this approximation. We obtain an abrupt transition from a 3-band regime to a 2-band one at a value of $S$ which is about 1/3 of the atomic SOC for Fe, justifying the 2-band model for the system.

8 pages, one figure. Model and techniques clarified, a figure added. Accepted in Phys. Rev. B

References in corpus (9)

• Mechanical Control of Spin States in Spin-1 Molecules and the Underscreened Kondo Effect
• Quantum phase transition in a single-molecule quantum dot
• Tuning the Kondo effect with a mechanically controllable break junction
• Rotationally-invariant slave-boson formalism and momentum dependence of the quasiparticle weight
• Anderson Model out of equilibrium: decoherence effects in transport through a quantum dot
• Conductance through an array of quantum dots
• Iron phthalocyanine on Au(111) is a "non-Landau" Fermi liquid
• The $SU(4)-SU(2)$ crossover and spin filter properties of a double quantum dot nanosystem
• Hund's metal regimes and orbital selective Mott transitions in three band systems

Cited by in corpus (1)

• Topological quantum phase transition in individual Fe Atoms on MoS${}_2$/Au(111)