Abstract
Magic-angle twisted bilayer graphene (MA-tBLG) has appeared as a tunable
testing ground to investigate the conspiracy of electronic interactions,
band structure, and lattice degrees of freedom to yield exotic quantum
many-body ground states in a two-dimensional (2D) Dirac material
framework. While the impact of external parameters such as doping or
magnetic field can be conveniently modified and analyzed, the
all-surface nature of the quasi-2D electron gas combined with its
intricate internal properties pose a challenging task to characterize
the quintessential nature of the different insulating and
superconducting states found in experiments. We analyze the interplay of
internal screening and dielectric environment on the intrinsic
electronic interaction profile of MA-tBLG. We find that interlayer
coupling generically enhances the internal screening. The influence of
the dielectric environment on the effective interaction strength depends
decisively on the electronic state of MA-tBLG. Thus, we propose the
experimental tailoring of the dielectric environment, e.g., by varying
the capping layer composition and thickness, as a promising pursuit to
provide further evidence for resolving the hidden nature of the quantum
many-body states in MA-tBLG.
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