[20a-A31-1~11] 17.3 層状物質

9:15 〜 9:30奨励賞エントリー英語発表

[20a-A31-2] Quasi-one-dimensional moiré in large-angle twisted bilayer WTe₂

〇Xiaohan Yang¹, Limi Chen², Yijin Zhang¹, Kohei Aso², Wataru Yamamori³, Rai Moriya¹, Kenji Watanabe⁴, Takashi Taniguchi⁴, Takao Sasagawa³, Yukiko Yamada-Takamura², Oshima Yoshifumi², Tomoki Machida¹ (1.IIS Univ. Tokyo, 2.JAIST, 3.Tokyo Tech., 4.NIMS)

キーワード：

twisted bilayer WTe2、moire、transmission electron microscope

Moiré effects in two-dimensional twisted bilayer systems are attracting great interests owing to the emergence of novel electronic structures and physical properties. Studies of moiré effects are, so far, mostly conducted at small twist angles, because the increase of twist angle quickly suppresses the size of moiré pattern caused by lattice. Here, we report an experimental discovery of quasi-one-dimensional (1D) moiré patterns in twisted bilayer tungsten ditelluride (tB-WTe₂) with large twist angles of 58° and 62°. Interestingly, the two quasi-1D moiré patterns at 58° and 62° are orthogonal to each other. We further elucidated the transformation between two quasi-1D moiré patterns through an intermediate 2D moiré pattern at 60°. Our results propose tB-WTe₂ as a novel platform for studying one-dimensional physics.