Single-water-dipole-layer-driven Reversible Charge Order Transition in 1T-TaS2
| Autor: | Jingjing Gao, Zhengwei Nie, Bin Shao, Yuping Sun, Xuan Luo, Sheng Meng, Bing Huang, Xiaoqiu Yuan, Shiwei Shen, Chenhaoping Wen, Shichao Yan |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Condensed matter physics Phonon Mechanical Engineering Bioengineering Charge (physics) 02 engineering and technology General Chemistry Electron 021001 nanoscience & nanotechnology Condensed Matter Physics law.invention Dipole law Quantum state General Materials Science Scanning tunneling microscope 0210 nano-technology Layer (electronics) Charge density wave |
| Zdroj: | Nano Letters. 20:8854-8860 |
| ISSN: | 1530-6992 1530-6984 |
| DOI: | 10.1021/acs.nanolett.0c03857 |
| Popis: | Water-solid interactions are crucial for many fundamental phenomena and technological processes. Here, we report a scanning tunneling microscopy study about the charge density wave (CDW) transition in 1T-TaS2 driven by a single water dipole layer. At low temperature, pristine 1T-TaS2 is a prototypical CDW compound with 13 × 13 charge order. After growing a highly ordered water adlayer, a new charge order with 3 × 3 periodicity emerges on water-covered 1T-TaS2. After water desorption, the entire 1T-TaS2 surface appears as localized 13 × 13 CDW domains that are separated by residual-water-cluster-pinned CDW domain walls. First-principles calculations show that the electric dipole moments in the water adlayer attract electrons to the top layer of 1T-TaS2, which shifts the phonon softening mode and induces the 13 × 13 to 3 × 3 charge order transition. Our results pave the way for creating new collective quantum states of matter with a molecular dipole layer. |
| Databáze: | OpenAIRE |
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