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Angle-resolved photoemission spectroscopy ARPES角分辨光电子能谱简介
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Angle-resolved photoemission spectroscopy (ARPES) is one of the most direct methods of studying the electronic structure of solids. By measuring the kine tic energy and angular distr ibution of the electrons photo emitted from a samp le illuminated with sufficient ly high-e nergy radiation, one can gain information on both the energy and momentum of the electron s propagating inside a material. This is of vital importance in elucidating the connection between electronic, magnetic , and chemical structure of solids, in particular for those complex systems which cannot be appropriate ly described within the independent-partic le picture. The last deca de witnessed significant progre ss in this techniqu e and its appli cations, thus ushering in a new era in photo electron spectroscopy; today, ARPES experim ents with 2 meV energy resolution and 0.28 angular resolution are a reality even for photoemission on solids. In this paper we will review the fundamentals of the techniqu e and present some illustrative experimental results; we will show how ARPES can probe the momentum-dependen t electronic struc ture of solids providing detai led information on band dispersion and Fermi surfac e as well as on the strength and nature of many- body correlations, which may profoundl y affect the one-electron excitation spectrum and in turn the macroscopic physical properties.[ 来自科研家族 晶体材料家族 ] |
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2013-05-02 23:40:58, 1.81 M
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2013-05-03 09:13
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