Phonon-assisted optical excitation in the narrow bandgap Mott insulator Sr3Ir2O7

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Title
Phonon-assisted optical excitation in the narrow bandgap Mott insulator Sr3Ir2O7
Author(s)
Hyun Ju Park; Chang Hee Sohn; Da Woon Jeong; G. Cao; K. W. Kim; S. J. Moon; Hosub Jin; Deok-Yong Cho; Tae Won Noh
Publication Date
2014-04
Journal
PHYSICAL REVIEW B, v.89, no.15, pp.155115 -
Publisher
AMER PHYSICAL SOC
Abstract
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 (ω<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.
URI
https://pr.ibs.re.kr/handle/8788114/1053
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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