The ground state and low-energy excitations of graphene and its bilayer are investigated by the density matrix renormalization group (DMRG) method. We analyze the effect of Coulomb interaction between the electrons including valley degrees of freedoms. The obtained results show finite charge excitation gap at various fractional fillings νn = 1/3, 2/5, 2/3 in the n = 0 and 1 Landau levels of single-layer graphene (SLG) and n = 2 Landau level of bilayer graphene (BLG). The lowest charge excitations at ν = 1/3, and 1 in SLG are valley skyrmions.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - 2011|
|Event||19th International Conference on the Application of High Magnetic Fields in Semiconductor Physics and Nanotechnology, HMF-19 - Fukuoka, Japan|
Duration: 2010 Aug 1 → 2010 Aug 6
ASJC Scopus subject areas
- Physics and Astronomy(all)