Spectrum of the Hole Excitation in Spin-Orbit Mott Insulator Na2IrO3

We study the motion of a hole with internal degrees of freedom,introduced to the zigzag magnetic ground state of Na2IrO3,by using the self-consistent Born approximation.We find that the low-,intermediate-,and high-energy spectra are primarily attributed to the singlet,triplet,and quintet hole contri...

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Bibliographic Details
Published in:Chinese physics letters 2023-07, Vol.40 (8), p.91-99
Main Authors: Wang, Wei, Dong, Zhao-Yang, Yu, Shun-Li, Li, Jian-Xin
Format: Article
Language:English
Online Access:Get full text
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Summary:We study the motion of a hole with internal degrees of freedom,introduced to the zigzag magnetic ground state of Na2IrO3,by using the self-consistent Born approximation.We find that the low-,intermediate-,and high-energy spectra are primarily attributed to the singlet,triplet,and quintet hole contributions,respectively.The spectral functions exhibit distinct features such as the electron-like dispersion of low-energy states near the Γ point,the maximum M-point intensity of mid-energy states,and the hole-like dispersion of high-energy states.These features are robust and almost insensitive to the exchange model and Hund's coupling,and are in qualitative agreement with the angular-resolved photoemission spectra observed in Na2Ir03.Our results reveal that the interference between internal degrees of freedom in different sublattices plays an important role in inducing the complex dispersions.
ISSN:0256-307X
DOI:10.1088/0256-307X/40/8/087101