Semiconductor-Metal Phase Transition and Emergent Charge Density Waves in 1 T -ZrX 2 (X = Se, Te) at the Two-Dimensional Limit

A charge density wave (CDW) is a collective quantum phenomenon in metals and features a wavelike modulation of the conduction electron density. A microscopic understanding and experimental control of this many-body electronic state in atomically thin materials remain hot topics in materials physics....

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Published in:Nano letters 2022-01, Vol.22 (1), p.476-484
Main Authors: Ren, Ming-Qiang, Han, Sha, Fan, Jia-Qi, Wang, Li, Wang, Pengdong, Ren, Wei, Peng, Kun, Li, Shujing, Wang, Shu-Ze, Zheng, Fa-Wei, Zhang, Ping, Li, Fangsen, Ma, Xucun, Xue, Qi-Kun, Song, Can-Li
Format: Article
Language:English
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Summary:A charge density wave (CDW) is a collective quantum phenomenon in metals and features a wavelike modulation of the conduction electron density. A microscopic understanding and experimental control of this many-body electronic state in atomically thin materials remain hot topics in materials physics. By means of material engineering, we realized a dimensionality and Zr intercalation induced semiconductor-metal phase transition in 1 -ZrX (X = Se, Te) ultrathin films, accompanied by a commensurate 2 × 2 CDW order. Furthermore, we observed a CDW energy gap of up to 22 meV around the Fermi level. Fourier-transformed scanning tunneling microscopy and angle-resolved photoemission spectroscopy reveal that 1 -ZrX films exhibit the simplest Fermi surface among the known CDW materials in TMDCs, consisting only of a Zr 4d derived elliptical electron conduction band at the corners of the Brillouin zone.
ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.1c04372