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We carry out an extensive numerical study of low-temperature electronictransport in quantum point contacts based on twisted bilayer graphene. Assumingballistic electron dynamics, quantized plateaus in the conductance are observedin defect-free samples when the twisting angle is large enough. However,plateaus are smeared out and hardly noticeable on decreasing the angle. Closeto the magic angle, the conductance around the charge neutrality point dropssignificantly and the quantization steps visible at higher angles are no longerappreciable. Furthermore, we consider the effects of a random distribution ofvacancies on the quantum point contact. Whereas the electron-hole symmetry isbroken in pristine samples, we find that this symmetry is restored uponincreasing the concentration of vacancies. We explain this effect by areduction of the effective interlayer coupling due to the presence of thevacancies.

Impact of vacancies on twisted bilayer graphene quantum point contacts