功能材料电子轨道的定量会聚束电子衍射研究进展

功能材料电子轨道的定量会聚束电子衍射研究进展

王诗雨，林  挺，尚彤彤，张庆华，谷  林^*

(1. 中国科学院物理研究所，北京100190；2. 清华大学，材料科学与工程学院，北京100084)

摘  要 功能材料以其独特的性能和广阔的应用前景，成为凝聚态物理和材料科学领域的重要研究热点之一。但与功能材料功能性起源相关的晶格、电荷、轨道和自旋四个基本自由度中，对轨道的表征手段较为有限。本文对近年发展的定量会聚束电子衍射(QCBED)表征轨道自由度的原理进行了深入讨论。此外，本文还介绍了利用QCBED在轨道自由度层面研究功能材料起源方面取得的最新进展，并对该方法的未来发展方向进行了简单展望。

关键词 定量会聚束电子衍射；轨道自由度；功能材料

中图分类号：O469；O73；O48  文献标识码：A     doi:10.3969/j.issn.1000-6281.2023.06.009

Recent progress in the orbital freedom characterization of functional materials by QCBED

WANG Shi-yu¹, LIN Ting¹, SHANG Tong-tong², ZHANG Qing-hua¹, GU Lin^2*

(1. Institute of Physics, Chinese Academy of Sciences, Beijing 100190; 2. School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China)

Abstract    With a variety of exotic properties and the corresponding potential applications, functional materials have been one of the major research areas in condensed matter physics and materials science. However, the characterization of the orbital is limited among the four basic degrees of freedom: lattice, charge, orbital and spin, which are related to the origin of functionality. In this review, we discuss in detail the principle of directly imaging the orbital by newly developed quantitative convergent-beam electron diffraction (QCBED). We also present recent progress in the study of the origin of functional materials from the level of orbital freedom by QCBED. In addition, we give a brief outlook on the future development of this method.

Keywords  QCBED; orbital freedom; functional materials

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