Acta Physica Sinica, Volume. 69, Issue 14, 147301-1(2020)
Fig. 1. (a) Schematic illustration of the moiré pattern in twisted bilayer graphene, the inserted shows the wrinkles of the graphene for different layer distances; (b) schematic illustration of twisted double bilayer graphene system; (c) moiré Brillouin zone of twisted graphene systems.
Fig. 2. (a) Band structures of twisted bilayer graphene at the magic angle; (b)Wilson loops of the two flat bands from the ).
Fig. 3. (a) Band structures of twisted double bilayer graphene at
; (b) the Chern number of the first conduction band for the
and vertical potential drop
.
Fig. 4. Real-space current-density distribution contributed by the flat bands of magic-angle twisted bilayer graphene: (a) ; (b)
valley,
; (c)
; (d)
valley,
. The black arrows indicate the dire-ctions of the current density, and the color coding indicates the magnetic field induced by the current in unites of Tesla.
Fig. 5. (a) The orbital magnetization contributed by the flat bands of the .
Magic angles derived from the pseudo Landau-level picture.
由赝朗道能级图像推算出的魔角
Magic angles derived from the pseudo Landau-level picture.
由赝朗道能级图像推算出的魔角
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Jian-Peng Liu, Xi Dai.
Received: Apr. 7, 2020
Accepted: --
Published Online: Dec. 28, 2020
The Author Email: Dai Xi (daix@ust.hk)