Suppression of the Charge Density Wave State in Two-Dimensional 1T-TiSe2 by Atmospheric Oxidation |
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| Authors: | Lifei Sun Chuanhui Chen Dr Qinghua Zhang Christian Sohrt Tianqi Zhao Dr Guanchen Xu Jinghui Wang Prof Dong Wang Prof Kai Rossnagel Prof Lin Gu Prof Chenggang Tao Prof Liying Jiao |
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| Institution: | 1. Key Lab of Organic Optoelectronics & Molecular Engineering, Department of Chemistry, Tsinghua University, Beijing, 100084 China;2. Department of Physics, Virginia Polytechnic Institute and State University, Blacksburg, VA, 24061 USA;3. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190 China;4. Institute for Experimental and Applied Physics, University of Kiel, 24098 Kiel, Germany |
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| Abstract: | Two-dimensional (2D) metallic transition-metal dichalcogenides (TMDCs), such as 1T-TiSe2, have recently emerged as unique platforms for exploring their exciting properties of superconductivity and the charge density wave (CDW). 2D 1T-TiSe2 undergoes rapid oxidation under ambient conditions, significantly affecting its CDW phase-transition behavior. We comprehensively investigate the oxidation process of 2D TiSe2 by tracking the evolution of the chemical composition and atomic structure with various microscopic and spectroscopic techniques and reveal its unique selenium-assisting oxidation mechanism. Our findings facilitate a better understanding of the chemistry of ultrathin TMDCs crystals, introduce an effective method to passivate their surfaces with capping layers, and thus open a way to further explore the functionality of these materials toward devices. |
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| Keywords: | charge density wave materials oxidation mechanism TiSe2 two-dimensional atomic crystals |
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