[16a-Z31-1~11] 17.2 Graphene

△ [16a-Z31-3] Landau level and band dispersion of artificially stacked CVD graphene

〇(B)Hikari Ogawa¹, Hirokazu Murano¹, Gen Ueda¹, Fumiyuki Inamura¹, Kenji Ikushima¹, Takashi Ikuta¹, Kenzo Maehashi¹ (1.Tokyo Univ. of A & T)

Keywords:graphene, quantum Hall effect

It is reported that carrier mobility and conductivity are significantly improved in artificially stacked graphene by the repeated transfer of CVD monolayer graphene. The G’ peak in Raman spectroscopy remained narrow and almost symmetric line shape even after multiple transfer steps, implying linear band dispersion due to weak interlayer coupling. However, Raman spectroscopy probes the band degeneracy only in the high energy region beyond 1 eV. The purpose of this work is to reveal the band dispersion of artificially stacked CVD graphene in the low-lying energy region near the charge neutral point through Landau-level splitting obtained from quantum Hall effects.