Optical transitions between Landau levels: AA-stacked bilayer graphene

Yen-Hung Ho; Jhao-Ying Wu; Rong-Bin Chen; Yu-Huang Chiu; Ming-Fa Lin
September 2010
Applied Physics Letters;9/6/2010, Vol. 97 Issue 10, p101905
Academic Journal
The magneto-optical absorption spectra of AA-stacked bilayer graphene (AABG) exhibit two kinds of absorption peaks resulting from two groups of Landau levels (LLs). Only intragroup excitations that follow a single selection rule take place. The excitation channels are altered as the field strength approaches a critical strength. These optical properties can be comprehended by the characteristics of the LL wave functions. A comparison of AABG and AB-stacked bilayer graphene (BBG) demonstrates that the optical properties are dominated by the stacking symmetry. The presented results could offer a way to distinguish AABG from BBG and monolayer graphene.


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