Optical absorption of charged excitons in semiconducting carbon nanotubes

In this article we examine the absorption coefficient of charged excitons in carbon nanotubes. We investigate the temperature and damping dependence of the absorption spectra. We show that the trion peak in the spectrum is asymmetric for temperatures greater than approximately 1 K whereas the absorption peak arising from excitons is symmetric. We expect the positive and negative trion absorption line shapes to be identical, independently of the chiral index (n,m).

► We treat the optical absorption coefficient of trions in carbon nanotubes (CNTs). ► We present optical absorption spectra for trions for different CNT species. ► We present the trion absorption spectra dependence on the temperature. ► We conclude onthe characteristics of the trion peak. ► We conclude on which external conditions one should expect to observe the trion peak.