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

[16a-Z31-4] Landau-level broadening evaluated from infrared emission in graphene

〇Fumiyuki Inamura¹, Gen Ueda¹, Hirokazu Murano¹, Kazuhiro Takizawa¹, Kenji Ikushima¹, Sunmi Kim², Mikhail Patrashin³, Iwao Hosako³, Susumu Komiyama^3,4 (1.Tokyo Univ. of A & T, 2.IIS, Univ. of Tokyo, 3.NICT, 4.Dept. of Basic Science, Univ. of Tokyo)

Keywords:Graphene, Landau-level broadening

Graphene forms unequally spaced Landau-levels (LL) under the strong magnetic field. Due to this unique Landau-level splitting, it is available to use graphene as magnetically tuned infrared emitter. However, the band width of the emission spectrum is determined by the LL broadening. The purpose of this work is to evaluate the LL broadening from the emission spectrum of infrared radiation from current-injected graphene and reveal the origin of the broadening. In this talk, we compare between the LL broadening estimated from LL radiative transition and that obtained by carrier mobility.