Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session K21: Moire Beyond Graphene I
3:00 PM–5:48 PM,
Tuesday, March 7, 2023
Room: Room 213
Sponsoring
Unit:
DCMP
Chair: Mit Naik, University of California, Berkeley
Abstract: K21.00003 : Valley physics in twisted bilayer BC3
3:24 PM–3:36 PM
Presenter:
Toshikaze Kariyado
(National Institute for Materials Science)
Author:
Toshikaze Kariyado
(National Institute for Materials Science)
Here, we pick up graphene derivative BC3 and show that it gives interesting valley dependent phenomena upon making twisted bilayer. The previous theory indicates that monolayer BC3 is a 2D semiconductor having three valleys. Then, in the twisted bilayer BC3, it is found that the 2D band dispersion is squeezed into quasi-1D ones in a valley dependent manner. Namely, the directionality of quasi-1D bands depends on valleys, which makes twisted bilayer BC3 promising for valleytronics. In addition, it is shown that the valley dependent 1D nature leads to spin-spin interaction crucially depending on valleys in the strongly correlated limit. Interpreting the valley degrees of freedom as orbital degrees of freedom, the effective model in the correlated limit is an interesting variant of Kugel-Khomskii model. A unique spin-valley coupling in this limit can give rise to exotic quantum phases with the twist angle as an interesting control parameter.
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