Fig. 4.

Miniband plasmons in BLG/hBN moiré superlattices. a Two-terminal resistance of one of our BLG/hBN superlattice devices as a function of V_g measured at given T. Inset: illustration of the BLG/hBN superlattice demonstrating a mismatch between graphene and hBN lattice constants. For simplicity, only one graphene layer is shown. b Normalized responsivity (red) and the FET-factor (black) as a function of V_g measured in the same device as in a. Dashed lines trace V_g where the FET-factor reaches extreme values in the vicinity of the sNP. Pink (blue) arrows point to the resonant peaks near the secondary (main) NP. L = 3 μm. c Schematic representation of the BLG/hBN superlattice band structure. In the vicinity of the $\tilde{\mathrm{\Gamma }}$-point (blue), BLG supports propagation of the ordinary plasma waves. Miniband THz plasmons emerge when the chemical potential approaches the sNP (pink)