The 83rd JSAP Autumn Meeting 2022

Presentation information

Oral presentation

17 Nanocarbon Technology » 17.3 Layered materials

[23p-B203-1~13] 17.3 Layered materials

Fri. Sep 23, 2022 1:30 PM - 5:00 PM B203 (B203)

Kosuke Nagashio(Univ. of Tokyo), Okada Susumu(Univ. of Tsukuba)

4:30 PM - 4:45 PM

[23p-B203-12] Laser ARPES and second harmonic generation in twisted bilayer WTe2

Keisuke Kamiya1, Yijin Zhang1, Takato Yamamoto2, Masato Sakano2, Keisuke Shinokita3, Shota Okazaki4, Satoru Masubuchi1, Kenji Watanabe5, Takashi Taniguchi1,5, Takao Sasagawa4, Kazunari Matsuda3, Kyoko Ishizaka2,6, Tomoki Machida1,7 (1.IIS, Univ. of Tokyo, 2.Univ. of Tokyo, 3.IAE, Kyoto Univ., 4.MSL, Tokyo Tech, 5.NIMS, 6.CEMS, RIKEN, 7.CREST-JST)

Keywords:transition metal dichalcogenide, symmetry, twisted van der Waals heterostructure

In the natural structure of the layered material WTe2, layers are stacked with the rotation of 180 degree. Therefore, the number of layers determines the symmetry and the appearance of many interesting properties. The twisted van der Waals heterostructure is a unique technique that can control the symmetry of the layer materials. In this study, we fabricated the 0 degree-twisted bilayer WTe2 to study the influence of the symmetry upon physical properties. We used the laser angle-resolved photoemission spectroscopy to directly observe the band dispersion. The symmetry of the bilayer WTe2 was further analyzed by the output of the optical second harmonic generation. We found that the twist angle strongly modulate the symmetry and the physical properties of the bilayer WTe2.