1202.2612 (E. Cisternas et al.)

Ab-initio analysis of superstructures revealed by STM on bilayer
graphene    [PDF]

E. Cisternas, J. D. Correa

In this work we performed density functional theory calculations for a
twisted bilayer graphene (BLG). Several conmensurable rotation angles were
analyzed and for each one a constant height mode STM image was obtained. These
STM images, calculated under the Tersoff-Hamman theory, reproduce the main
features experimentally observed. In this way we confirm that for BLG the
tunneling current intensity maxima occur over regions with $AA$ stacking, and
we give additional evidence in favour of an electronic origin for the
superstructures instead another physical grounds.

View original: http://arxiv.org/abs/1202.2612