Abstract
In a magnetic field graphene trilayers support a characteristic multiplet of 12 zero (energy) mode Landau levels with a threefold degeneracy in Landau orbitals. It was earlier noted for bilayer graphene that Coulombic vacuum fluctuations, specific to graphene, lift the orbital degeneracy of such zero-energy modes and that these “Lamb-shifted” orbital modes, with filling, get mixed via the Coulomb interaction. It is pointed out that an analogous orbital Lamb shift and mixing of zero-mode levels can also take place, with an enriched symmetry content, in -stacked trilayer graphene, and its consequences are discussed in the light of experimental results.
- Received 12 November 2012
DOI:https://doi.org/10.1103/PhysRevB.87.085413
©2013 American Physical Society