We investigate the bandwidth compression due to out of plane pressure of the moiré flatbands near charge neutrality in twisted bilayer graphene for a continuous range of small rotation angles of up to ∼ . The flatband bandwidth minima angles are found to grow linearly with interlayer coupling ω and decrease with Fermi velocity. Application of moderate pressure values of up to 2.5 GPa achievable through a hydraulic press should allow to access a flatband for angles as large as ∼ instead of ∼ at zero pressure. This reduction of the moiré pattern length for larger twist angles implies increase of the effective Coulomb interaction scale per moiré cell by about 50% and enhances roughly by a factor of ∼2 the elastic energy that resists the commensuration strains due to the moiré pattern. Our results suggest that application of pressure on twisted bilayer graphene nanodevices through a hydraulic press will notably facilitate the device preparation efforts required for exploring the ordered phases near magic angle flatbands.
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Chittari et al. (2018) studied this question.
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