A high-efficiency spin-resolved phototemission spectrometer combining time-of-flight spectroscopy with exchange-scattering polarimetry - Condensed Matter > Materials ScienceReportar como inadecuado




A high-efficiency spin-resolved phototemission spectrometer combining time-of-flight spectroscopy with exchange-scattering polarimetry - Condensed Matter > Materials Science - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: We describe a spin-resolved electron spectrometer capable of uniquelyefficient and high energy resolution measurements. Spin analysis is obtainedthrough polarimetry based on low-energy exchange scattering from aferromagnetic thin-film target. This approach can achieve a similar analyzingpower Sherman function as state-of-the-art Mott scattering polarimeters, butwith as much as 100 times improved efficiency due to increased reflectivity.Performance is further enhanced by integrating the polarimeter into atime-of-flight TOF based energy analysis scheme with a precise and flexibleelectrostatic lens system. The parallel acquisition of a range of electronkinetic energies afforded by the TOF approach results in an order of magnitudeor more increase in efficiency compared to hemispherical analyzers. The lenssystem additionally features a 90{\deg} bandpass filter, which by removingunwanted parts of the photoelectron distribution allows the TOF technique to beperformed at low electron drift energy and high energy resolution within a widerange of experimental parameters. The spectrometer is ideally suited forhigh-resolution spin- and angle-resolved photoemission spectroscopyspin-ARPES, and initial results are shown. The TOF approach makes thespectrometer especially ideal for time-resolved spin-ARPES experiments.



Autor: C. Jozwiak, J. Graf, G. Lebedev, N. Andresen, A.K. Schmid, A.V. Fedorov, F. El Gabaly, W. Wan, A. Lanzara, Z. Hussain

Fuente: https://arxiv.org/







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