IOP Publishing, Chinese Physics Letters, 8(40), p. 087101, 2023
DOI: 10.1088/0256-307x/40/8/087101
Full text: Unavailable
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 Na2IrO3. Our results reveal that the interference between internal degrees of freedom in different sublattices plays an important role in inducing the complex dispersions.