Very Efficient Spin Polarization Analysis (VESPA): New Exchange Scattering-based Setup for Spin-resolved ARPES at APE-NFFA Beamline at Elettra

Abstract

Complete Photoemission Experiments, enabling to measure the full quantum set of the photoelectron final state, are in high demand for the study of materials and nanostructures whose properties are determined by strong electron and spin correlations. We report here on the implementation of the new spin polarimeter VESPA (Very Efficient Spin Polarization Analysis) at the APE-NFFA Beamline at Elettra that is based on the exchange coupling between the photoelectron spin and a ferromagnetic surface in a reflectometry setup. The system was designed to be integrated with a dedicated Scienta-Omicron DA30 electron energy analyzer allowing for two simultaneous reflectometry measurements, along perpendicular axes, that, after magnetization switching of the two targets allow to perform the 3D vectorial reconstruction of the spin polarization while operating the DA30 in high resolution mode. VESPA represents the very first installation for spin resolved ARPES (SPARPES) at the Elettra synchrotron in Trieste, and is being heavily exploited by SPARPES users since fall 2015.

References in corpus (12)

• Discovery (theoretical prediction and experimental observation) of a large-gap topological-insulator class with spin-polarized single-Dirac-cone on the surface
• First observation of Spin-Momentum Helical Locking in Bi2Se3 and Bi2Te3, demonstration of Topological-Order at 300K and a realization of topological-transport-regime
• Observation of Weyl nodes in TaAs
• Coexistence of the topological state and a two-dimensional electron gas on the surface of Bi2Se3
• Probing the Low-Energy Electronic Structure of Complex Systems by ARPES
• Direct observation of spin-polarised bulk bands in an inversion-symmetric semiconductor
• Emergent quantum confinement at topological insulator surfaces
• Electronic Structure of the Topological Insulator Bi2Se3 Using Angle-Resolved Photoemission Spectroscopy: Evidence for a Nearly Full Surface Spin Polarization
• Spin polarization of the L-gap surface states on Au(111)
• Widespread spin polarization effects in photoemission from topological insulators
• Photoelectron spin-polarization-control in the topological insulator Bi2Se3
• A high-efficiency spin-resolved phototemission spectrometer combining time-of-flight spectroscopy with exchange-scattering polarimetry

Cited by in corpus (26)

• Ubiquitous formation of bulk Dirac cones and topological surface states from a single orbital manifold in transition-metal dichalcogenides
• Ferroelectric control of the spin texture in germanium telluride
• Maximal Rashba-like spin splitting via kinetic energy-driven inversion symmetry breaking
• Three-dimensional mapping of the altermagnetic spin splitting in CrSb
• Fermiology and Superconductivity of Topological Surface States in PdTe${}_2$
• Low-energy type-II Dirac fermions and spin-polarized topological surface states in transition-metal dichalcogenide NiTe${}_2$
• Measurements of the quantum geometric tensor in solids
• Electronic properties of type-II Weyl semimetal WTe${}_2$. A review perspective
• Enhanced ultrafast relaxation rate in the Weyl semimetal phase of $\mathbf{MoT}{\mathbf{e}}_2$ measured by time-and angle-resolved photoelectron spectroscopy
• Parallel spin-momentum locking in a chiral topological semimetal
• Influence of Spin Orbit Coupling in the Iron-Based Superconductors
• Tuning spin-charge interconversion with quantum confinement in ultrathin Bi/Ge(111) films
• Observation of highly anisotropic bulk dispersion and spin-polarized topological surface states in CoTe2
• Weyl-like points from band inversions of spin-polarised surface states in NbGeSb
• A general route to form topologically-protected surface and bulk Dirac fermions along high-symmetry lines
• Transfer Learning Application of Self-supervised Learning in ARPES
• Tuning Dirac nodes with correlated d-electrons in BaCo_{1-x}Ni_{x}S_{2}
• Spin-polarization of topological crystalline and normal insulator Pb${}_{1-x}$Sn${}_x$Se (111) epilayers probed by photoelectron spectroscopy
• Geometry-induced spin-filtering in photoemission maps from WTe${}_2$ surface states
• Uncovering the lowest thickness limit for room-temperature ferromagnetism of Cr${}_{1.6}$Te${}_2$
• Constraints on the two-dimensional pseudo-spin 1/2 Mott insulator description of Sr${}_2$IrO${}_4$
• One-Dimensional Spin-Polarised Surface States -- A Comparison of Bi(112) with Other Vicinal Bismuth Surfaces
• Development of a versatile micro-focused angle-resolved photoemission spectroscopy system with Kirkpatrick-Baez mirror optics
• Spin-orbit effects at chiral surfaces
• Spin- and angle-resolved photoemission studies of the electronic structure of Si(110)"16x2" surfaces
• Tomographic mapping of the hidden dimension in quasi-particle interference