Unveiling the Electronic Origin of Anomalous Contact Conductance in Twisted Bilayer Graphene
The study investigated a surprising non-monotonic current pattern in twisted bilayer graphene as a function of rotation angle, finding a peak at 5 degrees that contradicts previous structural relaxation theories. The research shows this maximum is caused by the electronic band structure evolving, specifically van Hove singularities shifting toward the Fermi level, rather than changes in atomic spacing.