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Direct observation of mono-layer, bi-layer, and tri-layer charge density waves in 1T-TaS2 by transmission electron microscopy without a substrate
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| Title: | Direct observation of mono-layer, bi-layer, and tri-layer charge density waves in 1T-TaS2 by transmission electron microscopy without a substrate |
| Authors: | Sakabe, Daiki Browse this author | | Liu, Zheng Browse this author | | Suenaga, Kazutomo Browse this author | | Nakatsugawa, Keiji Browse this author | | Tanda, Satoshi Browse this author →KAKEN DB |
| Issue Date: | 25-Apr-2017 |
| Publisher: | Nature Publishing Group |
| Journal Title: | npj Quantum Materials |
| Volume: | 2 |
| Start Page: | 1 |
| End Page: | 6 |
| Publisher DOI: | 10.1038/s41535-017-0025-8 |
| Abstract: | Charge-density-waves, which occur mainly in low-dimensional systems, have a macroscopic wave function similar to superfluids and superconductors. Kosterlitz-Thouless transition is observed in superfluids and superconductors, but the presence of Kosterlitz-Thouless transition in ultra-thin charge-density-waves systems has been an open problem. We report the direct real-space observation of charge-density-waves with new order states in mono-layer, bi-layer, and tri-layer 1T-TaS2 crystals using a low voltage scanning-transmission-electron-microscopy without a substrate. This method is ideal to observe local atomic structures and possible defects. We clearly observed that the mono-layer crystal has a new triclinic stripe charge-density-waves order without satisfying the triple q condition q(1) + q(2) + q(3) = 0. A strong electron-phonon interaction gives rise to new crevasse (line) type defects instead of disclination (point) type defects due to the Kosterlitz-Thouless transition. These results reaffirm the importance of the electron-phonon interaction in mono-layer nanophysics. |
| Rights: | http://creativecommons.org/licenses/by/4.0/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/67147 |
| Appears in Collections: | 工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)
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Submitter: 丹田 聡
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