Probing the electronic structure of complex systems by ARPES
Probing the electronic structure of complex systems by ARPES
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DOI：
10.1238/physica.topical.109a00061
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发表时间：
2004-01-01
期刊：
影响因子：
2.9
通讯作者：
Damascelli, Andrea
中科院分区：
文献类型：
--
作者：
Damascelli, Andrea
角分辨光电子能谱（ARPES）是研究固体电子结构最直接的方法之一。通过测量从用足够高能量的辐射照射的样品光发射的电子的动能和角分布，可以获得关于在材料内传播的电子的能量和动量的信息。这对于阐明固体的电子、磁性和化学结构之间的联系至关重要，特别是对于那些不能在独立粒子图像中适当描述的复杂系统。在过去的十年里，这项技术及其应用取得了重大进展，从而开创了光电子能谱的新时代;今天，具有2 meV能量分辨率和0.2度角分辨率的ARPES实验即使对于固体上的光电子发射也是现实。在本文中，我们将审查的基本原理的技术，并提出一些说明性的实验结果，我们将展示如何ARPES可以探测动量相关的固体电子结构提供详细的信息带色散和费米面以及多体相关的强度和性质，这可能会深刻影响单电子激发光谱，进而宏观物理性质。
Angle-resolved photoemission spectroscopy (ARPES) is one of the most direct methods of studying the electronic structure of solids. By measuring the kinetic energy and angular distribution of the electrons photoemitted from a sample illuminated with sufficiently high-energy radiation, one can gain information on both the energy and momentum of the electrons 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 appropriately described within the independent-particle picture. The last decade witnessed significant progress in this technique and its applications, thus ushering in a new era in photoelectron spectroscopy; today, ARPES experiments with 2meV energy resolution and 0.2 degrees angular resolution are a reality even for photoemission on solids. In this paper we will review the fundamentals of the technique and present some illustrative experimental results; we will show how ARPES can probe the momentum-dependent electronic structure of solids providing detailed information on band dispersion and Fermi surface as well as on the strength and nature of many-body correlations, which may profoundly affect the one-electron excitation spectrum and in turn the macroscopic physical properties.