journal article·2023-10

Topological Flat Bands in 2D Breathing‐Kagome Lattice Nb3TeCl7

Hongrun Zhang, Zhijian Shi, Zhicheng Jiang, Ming Yang, Jingwei Zhang, Ziyuan Meng, Tonghua Hu, Fucai Liu, Long Cheng, Yong Xie, Jincheng Zhuang, Haifeng Feng, Weichang Hao, Dawei Shen, Yi Du

Advanced Materials· Volume 35· Issue 41
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Abstract

Abstract Flat bands (FBs) can appear in two‐dimensional (2D) geometrically frustrated systems caused by quantum destructive interference (QDI). However, the scarcity of pure 2D frustrated crystal structures in natural materials makes FBs hard to be identified, let alone modulate FBs relating to electronic properties. Here, the experimental evidence of the complete electronic QDI induced FB contributed by the 2D breathing‐kagome layers of Nb atoms in Nb3TeCl7 (NTC) is reported. An identical chemical state and 2D localization characteristics of the Nb breathing‐kagome layers are experimentally confirmed, based on which NTC is demonstrated to be a superior concrete candidate for the breathing‐kagome tight‐binding model. Furthermore, it theoretically establishes the tunable roles of the on‐site energy over Nb sites on bandwidth, energy position, and topology of FBs in NTC. This work opens an aveanue to manipulate FB characteristics in these 4d transition‐metal‐based breathing‐kagome materials.
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Research context

OpenAlex topics: Advanced Condensed Matter Physics · Topological Materials and Phenomena · Electronic and Structural Properties of Oxides

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Physics Beihang University Beijing 100191 P. R. China

Centre of Quantum and Matter Sciences International Research Institute for Multidisciplinary Science Beihang University Beijing 100191 P. R. China

State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 P. R. China

School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China Chengdu 611731 P. R. China

Beijing Key Laboratory of Advanced Nuclear Materials and Physics Beihang University Beijing 100191 P. R. China

Key Laboratory of Intelligent Systems and Equipment Electromagnetic Environment Effect School of Electronic and Information Engineering Beihang University Beijing 100191 P. R. China

National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei Anhui 230029 P. R. China

Funding

National Natural Science Foundation of China · Natural Science Foundation of Beijing Municipality · Fundamental Research Funds for the Central Universities

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