Rich magneto-absorption spectra of AAB-stacked trilayer graphene.
A generalized tight-binding model is developed to investigate the feature-rich magneto-optical properties of AAB-stacked trilayer graphene. Three intragroup and six intergroup inter-Landau-level (inter-LL) optical excitations largely enrich magneto-absorption peaks. In general, the former are much higher than the latter, depending on the phases and amplitudes of LL wavefunctions. The absorption spectra exhibit single- or twin-peak structures which are determined by quantum modes, LL energy spectra and Fermion distribution. The splitting LLs, with different localization centers (2/6 and 4/6 positions in a unit cell), can generate very distinct absorption spectra. There exist extra single peaks because of LL anti-crossings. AAB, AAA, ABA, and ABC stackings considerably differ from one another in terms of the inter-LL category, frequency, intensity, and structure of absorption peaks. The main characteristics of LL wavefunctions and energy spectra and the Fermi-Dirac function are responsible for the configuration-enriched magneto-optical spectra.
Department of Physics, National Cheng Kung University, Tainan, Taiwan. l28981084@mail.ncku.edu.tw mflin@mail.ncku.edu.tw.
Thi-Nga
TN
Do
Department of Physics, National Cheng Kung University, Tainan, Taiwan. l28981084@mail.ncku.edu.tw mflin@mail.ncku.edu.tw.
Po-Hsin
PH
Shih
Center for General Education, Tainan University of Technology, Tainan, Taiwan.
Cheng-Peng
CP
Chang
Department of Physics, National Cheng Kung University, Tainan, Taiwan. l28981084@mail.ncku.edu.tw mflin@mail.ncku.edu.tw.
Chiun-Yan
CY
Lin
Department of Physics, National Cheng Kung University, Tainan, Taiwan. l28981084@mail.ncku.edu.tw mflin@mail.ncku.edu.tw.
Ming-Fa
MF
Lin