Fingerprints of entangled spin and orbital physics in itinerant ferromagnets via angle resolved $resonant$ photoemission

Abstract

A novel method for mapping the local spin and orbital nature of the ground state of a system via corresponding flip excitations in both sectors is proposed based on angle resolved resonant photoemission and related diffraction patterns, presented here for the first time via an ab-initio modified one-step theory of photoemission. The analysis is done on the paradigmatic weak itinerant ferromagnet bcc Fe, whose magnetism, seen as a correlation phenomenon given by the coexistence of localized moments and itinerant electrons, and the non-Fermi liquid behaviour at ambient and extreme conditions both remain unclear. The results offer a real space imaging of local pure spin flip and entangled spin flip-orbital flip excitations (even at energies where spin flip transitions are hidden in quasiparticle peaks) and of chiral, vortex-like wavefronts of excited electrons, depending on the orbital character of the bands and the direction of the local magnetic moment. Such effects, mediated by the hole polarization, make resonant photoemission a promising tool to perform a full tomography of the local magnetic properties of a system with a high sensitivity to localization/correlation, even in itinerant or macroscopically non magnetic systems.

References in corpus (12)

• Strong electronic correlations from Hund's coupling
• Orbital textures and charge density waves in transition metal dichalcogenides
• Theoretical evidence for strong correlations and incoherent metallic state in FeSe
• Spin dynamics and an orbital-antiphase pairing symmetry in iron-based superconductors
• Mapping the unconventional orbital texture in topological crystalline insulators
• Spin Polarization of Photoelectrons from Topological Insulators
• Electronic properties and magnetism of iron at the Earth's inner core conditions
• Noncollinear Magnetic Order Stabilized by Entangled Spin-Orbital Fluctuations
• Spin Order accompanying Loop-Current Order in Cuprates
• Photoemission Circular Dichroism and Spin Polarization of the Topological Surface States in Ultrathin Bi2Te3 Films
• On the ab initio calculation of CVV Auger spectra in closed-shell systems
• Observation and resonant x-ray optical interpretation of multi-atom resonant photoemission effects in O 1s emission from NiO

Cited by in corpus (2)

• Unexpectedly large electron correlation measured in Auger spectra of ferromagnetic iron thin films: orbital-selected Coulomb and exchange contributions
• One-step approach to ARPES from strongly correlated solids: a Mott-Hubbard system