Phonon-assisted optical excitation in the narrow bandgap Mott insulator Sr3Ir2O7
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- Phonon-assisted optical excitation in the narrow bandgap Mott insulator Sr3Ir2O7
- Park, HJ; Sohn, Chang Hee; Jeong, DW; Cao, G; Kim, KW; Moon, SJ; Jin, Hosub; Cho, Deok-Yong; Noh, TW
- Issue Date
- AMER PHYSICAL SOC
- PHYSICAL REVIEW B, v.89, pp.155115
- We examined the temperature (T) evolution of the optical conductivity spectra of Sr3Ir2O7 over a wide range of 10-400 K. The system was barely insulating, exhibiting a small indirect bandgap of <= 0.1 eV. The low-energy features of the optical d-d excitation (h omega < 0.3 eV) evolved drastically, whereas such evolution was not observed for the O K-edge x-ray-absorption spectra. This suggests that the T evolution in optical spectra is not caused by a change in the bare (undressed) electronic structure, but instead presumably originates from an abundance of phonon-assisted indirect excitations. Our results showed that the low-energy excitations were dominated by phonon-absorption processeswhich involved, in particular, the optical phonons. This implies that phonon-assisted processes significantly facilitate the charge dynamics in barely insulating Sr3Ir2O7.
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