[15p-A403-1~6] 17.1 カーボンナノチューブ，他のナノカーボン材料

[15p-A403-6] Dielectric screening effects on photoluminescence of carbon nanotubes on hexagonal boron nitride

〇Fang Nan¹、Otsuka Keigo¹、Taniguchi Takashi²、Watanabe Kenji²、Nagashio Kosuke³、Kato Yuichiro¹ (1.RIKEN、2.NIMS、3.Tokyo Univ.)

キーワード：carbon nanotubes、hexagonal boron nitride、photoluminescence

Hexagonal boron nitride (h-BN), a two-dimensional (2D) material, is atomically flat with low defect density, which is widely used to support other 2D materials. We expect that the advantages of h-BN can also be utilized in mixed dimensional heterostructures, and single-walled carbon nanotubes (CNTs) would provide a unique opportunity in this context. The one-dimensional nature of CNTs results in enhanced Coulomb interactions, giving rise to tightly bound excitons that show photoluminescence (PL) at room temperature. CNTs directly attached on solid-state substrates such as SiO₂/Si, however, suffers from the strong substrate quenching effect. By using h-BN as a substrate, the quenching effect is expected to be suppressed. Moreover, excitons in CNTs are sensitive to the dielectric environment, and intimate contact with the h-BN could result in large modifications in excitonic energies.