Orbital-Dependent Polaron Formation in the Relativistic Mott Insulator Sr2IrO4

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Title
Orbital-Dependent Polaron Formation in the Relativistic Mott Insulator Sr2IrO4
Author(s)
Chang Hee Sohn; Min-Cheol Lee; Hyun Ju Park; Kyung Joo Noh; Hyang Keun Yoo; Soon Jae Moon; Kyung Wan Kim; T. F. Qi; G. Cao; Deok-Yong Cho; Tae Won Noh
Publication Date
2014-07
Journal
PHYSICAL REVIEW B, v.90, no.4, pp.041105(R) -
Publisher
AMER PHYSICAL SOC
Abstract
We use optical spectroscopy to investigate the electron-phonon interaction in Sr2IrO4, a well-known 5d transition metal oxide with spin-orbit entangled states. The temperature evolution in the optical spectra is well described by the Fr¨ohlich polaron model, indicating a large electron-phonon interaction. We further find that electrons in different orbitals selectively couple with different phonon modes. While Jeff = 3/2 holes do not seem to couple with any phonons, Jeff = 1/2 and 3z2-r2 electrons mainly couple with in-plane and out-of-plane Ir-O bending modes, respectively. The symmetries of the orbitals and phonons are consistent with our observations.
URI
https://pr.ibs.re.kr/handle/8788114/986
ISSN
2469-9950
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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