期刊
APPLIED PHYSICS LETTERS
卷 120, 期 3, 页码 -出版社
AIP Publishing
DOI: 10.1063/5.0080133
关键词
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资金
- Russian Foundation for Basic Research (RFBR)-Japan Society for the Promotion of Science (JSPS) Bilateral Joint Research Projects (Russia-Japan) [RFBR 20-52-50012, JPJSBP120204815]
- Czech Science Foundation [19-17997S]
- Ministry of Education, Youth and Sports [LM2018103]
This study investigates the structural transformation from an amorphous phase to a one-dimensional vdW crystal and identifies a unique feature associated with vdW bonds using x-ray absorption spectroscopy. The researchers believe that this approach can be applied to study other one-dimensional vdW solids.
Trigonal selenium is a prototypical one-dimensional (1D) van der Waals (vdW) solid, where covalently bonded helical chains are held together by weaker vdW forces. In this work, we have studied structural transformation from a three-dimensional amorphous phase of non-interacting Se chains into a 1D vdW crystal using x-ray absorption spectroscopy. The crystallization process and establishment of vdW interaction are accompanied by elongation and weakening of covalent Se-Se bonds. We have found a unique signature in the x-ray absorption near-edge structure spectrum that is associated with vdW bonds and can be used to identify the formation of the latter. We believe that a similar approach can be used to study other 1D vdW solids, such as transition-metal trichalcogenides, and particularly stress the usefulness of x-ray absorption spectroscopy to identify vdW bonds.
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