期刊
APPLIED PHYSICS LETTERS
卷 118, 期 21, 页码 -出版社
AIP Publishing
DOI: 10.1063/5.0052240
关键词
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资金
- National Key Research and Development Program [2016YFA0300404, 2019YFA0308602]
- Fundamental Research Funds for the Central Universities in China
- National Nature Science Foundation of China [11674326, 11874357, 11774351, 11974061]
- Chinese Academy of Sciences' Large-Scale Scientific Facility [U1832141, U1932217, U2032215]
- Key Research Program of Frontier Sciences, CAS [QYZDB-SSW-SLH015]
- Excellence and Scientific Research Grant of Hefei Science Center of CAS [2018HSC-UE011]
- Open Project of State Key Laboratory of Superhard Materials, Jilin University [201902]
- Joint Funds of the National Natural Science Foundation of China
The study found that Ti doping in 1T-TaS2 led to an unexpected chiral CDW phase, possibly due to doping-enhanced orbital order, and only when x=0.08, the possible long-range orbital order may trigger the chiral CDW phase. Compared with other 3d-elements doped 1T-TaS2, Ti doping retained the electronic flatband and corresponding CDW phase, which is necessary for the emergence of chirality.
We investigate the Ti-doping effect on the charge density wave (CDW) of 1T-TaS2 by combining scanning tunneling microscopy measurements and first-principle calculations. Although the Ti-doping induced phase evolution seems regular with an increase of the doping concentration (x), an unexpected chiral CDW phase is observed in the sample with x=0.08, in which Ti atoms almost fully occupy the central Ta atoms in the CDW clusters. The emergence of the chiral CDW is proposed to be from the doping-enhanced orbital order. Only when x=0.08, the possible long-range orbital order can trigger the chiral CDW phase. Compared with other 3d-elements doped 1T-TaS2, the Ti-doping retains the electronic flatband and the corresponding CDW phase, which is a prerequisite for the emergence of chirality. We expect that introducing elements with a strong orbital character may induce a chiral charge order in a broad class of CDW systems. The present results open up another avenue for further exploring the chiral CDW materials.
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