Semiconductor-Metal Phase Transition and Emergent Charge Density Waves in 1<i>T</i>-ZrX<sub>2</sub> (X = Se, Te) at the Two-Dimensional Limit.
basic_science · Level V
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- Record sourced from PubMed, PMID 34978815.
- Also identified by DOI 10.1021/acs.nanolett.1c04372.
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Abstract
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<i>T</i>-ZrX<sub>2</sub> (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<i>T</i>-ZrX<sub>2</sub> 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.