Topological confinement in trilayer grapheneTopological confinement in trilayer graphene
Faculty of Sciences. Physics
Condensed Matter Theory
2014Lancaster, Pa, 2014
Physical review : B : condensed matter and materials physics. - Lancaster, Pa, 1998 - 2015
89(2014):3, p. 1-5
University of Antwerp
We calculate the spectrum of states that are localized at the interface between two regions of opposite bias in trilayer graphene (TLG). These potential profiles, also known as potential kinks, have been predicted to support two different branches of localized states for the case of bilayer graphene, and show similarities to the surface states of topological insulators. On the other hand, we found that ABC stacked TLG exhibits three different unidimensional branches of states in each valley that are confined to the kink interface. They have the property E(k(y)) = -E(-k(y)) when belonging to the same valley and E-K(k(y)) = -E-K' (-k(y)). A kink-antikink potential profile opens a gap in the spectrum of these one-dimensional states.