(Invited) High Temperature Light Emission Spectra of Metallic Carbon Nanotubes Under Different Heating Methods

Abstract

Semiconducting single-walled carbon nanotubes (SWCNTs) show exceptional optical properties such as excitonic thermal radiation under thermal equilibrium [1,2] as well as exciton luminescence under nonequilibrium conditions, which potentially provides various promising applications including photonic and thermo-optic devices. With regard to the counterpart, metallic SWCNTs, high-temperature light emission induced by Joule heating has been reported [3,4], but the effects of nonequilibrium induced by the current injection on the light emission remain to be clarified. Here, we report comparison of high-temperature light emission from an identical individual metallic SWCNT under laser- and Joule-heating conditions. The spectral shapes were qualitatively different depending on the heating methods. We will discuss these high-temperature light emission phenomena quantitatively in terms of the electron and phonon distribution. [1] T. Nishihara, A. Takakura, Y. Miyauchi, and K. Itami, Nat. Commun. 9, 3144 (2018). [2] S. Konabe, T. Nishihara, and Y. Miyauchi, Opt. Lett. 46, 3021 (2021). [3] D. Mann et al., Nat. Nanotechnol. 2, 33 (2007), [4] Z. Liu et al., ACS Nano 5, 4634 (2011).