Highly Efficient Multichannel Spin-Polarization Detection

Abstract

Since the original work by Mott, the low efficiency of electron spin polarimeters, remaining orders of magnitude behind optical polarimeters, has prohibited many fundamental experiments. Here we report a solution to this problem using a novel concept of multichannel spin-polarization analysis that provides a stunning increase in efficiency by 4 orders of magnitude. This improvement was demonstrated in a setup using a hemispherical electron energy analyzer. An imaging setup proved the principal capability of resolving more than 10(5) data points in parallel.

New Developments in Spin-Dependent Photoemission

“…This becomes feasible by a new generation of two-dimensional spin polarimeters [18,19]. The combination of momentum microscopy with a two-dimensional spin polarimeter yields a view into the spin-polarized electronic structure with unprecedented detail [62].…”

“…The third line of evolution aimed * This paper was presented at the 11th International Symposium on Atomic Level Characterizations for New Materials and Devices '17, Aqua Kauai Beach Resort, Kauai, Hawaii, USA, December [3][4][5][6][7][8]2017. † Corresponding author: c.m.schneider@fz-juelich.de at improving the efficiency of explicit spin polarization detection by moving from standard single-channel high energy Mott detectors [11][12][13] to low-energy single-channel [14][15][16] and multi-channel polarimeters [17][18][19]. A more concise compilation of the various spin-resolving photoelectron spectroscopy concepts is given in a recent review by Okuda [20].…”

Spin-Polarized Angle-Resolved Photoemission Spectroscopy Study of Magnetism

“…[9] and (b) spinpolarized ARPES spectra [10]. Geometry of the scattering process for simultaneous acquisition of 16 data points and (c) corresponding momentum scheme in the kinematic approximation for specular reflection for W(100) [14].…”

Probing buried layers by photoelectron spectromicroscopy with hard x-ray excitation

“…2 Likewise, the desire to study the electronic structure of novel magnetic materials in detail triggered the development of more efficient spin polarization detectors. [3][4][5] The geometric arrangement of atoms at and adsorbates on surfaces can be conveniently deduced from photoelectron diffraction, i.e., the scattering of the outgoing photoelectron wave at neighboring atoms. [6][7][8] The progress in laser technology nowadays enables pump-probe photoemission experiments with time resolution even in the femtosecond regime, which provide information about electronic excitations and dynamics as well as chemical reaction kinetics.…”