学術雑誌論文 Direct observation of mono-layer, bi-layer, and tri-layer charge density waves in 1T-TaS2 by transmission electron microscopy without a substrate

Sakabe, Daiki  ,  Liu, Zheng  ,  Suenaga, Kazutomo  ,  Nakatsugawa, Keiji  ,  Tanda, Satoshi

2pp.1 - 6 , 2017-04-25 , Nature Publishing Group
ISSN:2397-4648
内容記述
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.
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https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/67147/1/s41535-017-0025-8.pdf

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