[15p-F203-1~18] 17.1 カーボンナノチューブ，他のナノカーボン材料

▲ [15p-F203-3] Gate-voltage induced trions in suspended carbon nanotubes

〇吉田 匡廣¹、Alexander Popert²、加藤 雄一郎¹ (1.理研、2.東大院工)

キーワード：carbon nanotubes, trion, photoluminescence

We observe trion emission from suspended carbon nanotubes where carriers are introduced electrostatically using field-effect transistor structures [1]. The trion peak emerges below the E₁₁ emission energy at gate voltages that coincide with the onset of bright exciton quenching. By investigating nanotubes with various chiralities, we verify that the energy separation between the bright exciton peak and the trion peak becomes smaller for larger diameter tubes. Trion binding energies that are significantly larger compared to surfactant-wrapped carbon nanotubes are obtained, and the difference is attributed to the reduced dielectric screening in suspended tubes.
[1] M. Yoshida, A. Popert, Y. K. Kato, Phys. Rev. B 93, 041402(R) (2016).