Moire bands in twisted trilayer black phosphorene: effects of pressure and electric field

E Wang and XL Zou, NANOSCALE, 14, 3758-3767 (2022).

DOI: 10.1039/d1nr07736h

Twist-induced moire bands and accompanied correlated phenomena have been extensively investigated in twisted hexagonal lattices with weak interlayer coupling. However, the formation of moire bands in strongly coupled layered materials and their controlled tuning remain largely unexplored. Here, we systematically study the moire bands in twisted trilayer black phosphorene (TTbP) and the influences of pressure and electric field on them. Moire states can form in various TTbPs even when the twist angle is larger than 16 degrees similar to that of twisted bilayer bP. However, different TTbPs show different localization patterns depending on the twisting layer, leading to distinct dipolar behaviors. While these moire states become quasi-one-dimensional (1D) as the twist angle decreases, external pressure causes the crossover of moire states from quasi-1D to 0D with a dramatic change in localization areas and greatly reduced bandwidth. Interestingly, compared to twisted bilayer and pristine bP, TTbPs show a much larger electric-field induced Stark effect, controllable by either the twist angle or twist layer. Our work thus demonstrates TTbP as an attractive platform to explore moire- controlled electronic and optical properties, as well as tunable optoelectronic applications.

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