Optical transitions between Landau levels: AA-stacked bilayer graphene
arXiv:1004.3684 · doi:10.1063/1.3488806
Abstract
The low-frequency optical excitations of AA-stacked bilayer graphene are investigated by the tight-binding model. Two groups of asymmetric LLs lead to two kinds of absorption peaks resulting from only intragroup excitations. Each absorption peak obeys a single selection rule similar to that of monolayer graphene. The excitation channel of each peak is changed as the field strength approaches a critical strength. This alteration of the excitation channel is strongly related to the setting of the Fermi level. The peculiar optical properties can be attributed to the characteristics of the LL wave functions of the two LL groups. A detailed comparison of optical properties between AA-stacked and AB-stacked bilayer graphenes is also offered. The compared results demonstrate that the optical properties are strongly dominated by the stacking symmetry. Furthermore, the presented results may be used to discriminate AABG from MG, which can be hardly done by STM.
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- Antiferromagnetic states and phase separation in doped AA-stacked graphene bilayers
- Electrically tunable plasma excitations in AA-stacking multilayer graphene
- AA stacking, tribological and electronic properties of double-layer graphene with krypton spacer
- The Haldane model under nonuniform strain
- Combined Effect of Stacking and Magnetic Field on Plasmon Excitations in Bilayer Graphene
- The selection rule of graphene in a composite magnetic field
- Applied electric and magnetic field effects on the bandgap formation and antiferromagnetic ordering in AA-stacked Bilayer Graphene