تقرير
Phonon-assisted optical excitation in the narrow bandgap Mott insulator Sr3Ir2O7
| العنوان: | Phonon-assisted optical excitation in the narrow bandgap Mott insulator Sr3Ir2O7 |
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| المؤلفون: | Park, H. J., Sohn, C. H., Jeong, D. W., Cao, G., Kim, K. W., Moon, S. J., Jin, Hosub, Cho, Deok-Yong, Noh, T. W. |
| سنة النشر: | 2014 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Strongly Correlated Electrons |
| الوصف: | We examined the temperature (T) evolution of the optical conductivity spectra of Sr$_3$Ir$_2$O$_7$ over a wide range of 10-400 K. The system was barely insulating, exhibiting a small indirect bandgap of $\sim$0.1 eV. The low-energy features of the optical d-d excitation (${\hbar}{\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 processes which involve, in particular, the optical phonons. This implies that phonon-assisted processes significantly facilitate the charge dynamics in barely insulating Sr$_3$Ir$_2$O$_7$. Comment: submitted to Phys. Rev. B |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevB.89.155115 |
| URL الوصول: | http://arxiv.org/abs/1401.1325 |
| رقم الأكسشن: | edsarx.1401.1325 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevB.89.155115 |
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