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Sohn, Chae Hoon; Kim, H.S.; Qi, Tongfei; Jeong, Da Woon; Park, Hyun Ju; Yoo, Hyang Keun; Kim, Hong Hee; Kim, J.Y.; Kang, Thomas H.‐K.; Cho, Deok‐Yong; Cao, G.; Yu, Jaejun; Moon, Seok‐Jun; Noh, T. W.

doi:10.1103/physrevb.88.085125

Cited by 51 publications

(35 citation statements)

References 28 publications

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“…11(b)]. Meanwhile the lack of dependence upon momentum transfer may result from significant mixing between the j = 1/2 ground state and the j = 3/2 band, as proposed for Na 2 IrO 3 [50].…”

Section: Theory Of Epcmentioning

confidence: 91%

High-resolution resonant inelastic x-ray scattering study of the electron-phonon coupling in honeycomb α−Li2IrO3

et al. 2019

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The excitations in honeycomb α-Li2IrO3 have been investigated with high-resolution resonant inelastic x-ray scattering (RIXS) at the O K edge. The low-energy response is dominated by a fully resolved ladder of excitations, which we interpret as being due to multi-phonon processes in the presence of strong electron-phonon coupling (EPC). At higher energies, the orbital excitations are shown to be dressed by phonons. The high quality of the data permits a quantitative test of the analytical model for the RIXS cross-section, which has been proposed to describe EPC in transition metal oxides (TMOs). We find that the magnitude of the EPC is comparable to that found for a range of 3d TMOs. This indicates that EPC may be of equal importance in determining the phenomenology displayed by corresponding 5d based systems. arXiv:1911.07545v2 [cond-mat.str-el]

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“…11(b)]. Meanwhile the lack of dependence upon momentum transfer may result from significant mixing between the j = 1/2 ground state and the j = 3/2 band, as proposed for Na 2 IrO 3 [50].…”

Section: Theory Of Epcmentioning

confidence: 91%

High-resolution resonant inelastic x-ray scattering study of the electron-phonon coupling in honeycomb α−Li2IrO3

et al. 2019

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“…σ (ω) * bomisu@postech.ac.kr † g.khaliullin@fkf.mpg.de ‡ bimin@postech.ac.kr and RIXS spectra for Na 2 IrO 3 display some features distinct from those in Sr 2 IrO 4 . Instead of a two-peak structure, σ (ω) of Na 2 IrO 3 shows just a broad single peak at higher energy of ∼1.5 eV [17,22]. SO exciton peak is present in RIXS spectra of Na 2 IrO 3 too, but it has a well resolved two-peak structure and a negligible momentum dependence.…”

mentioning

confidence: 94%

“…They are adopted to be consistent with literature ( [17], tr [20]) and to optimize theoretical RIXS spectra (10Dq, J H , λ, t pdσ ) and σ (ω) (U ). [17], dot-dashed line [22]). The observed sharp peak near 0.1 eV is of phonon origin (not included in our calculations).…”

mentioning

confidence: 99%

Electronic excitations in the edge-shared relativistic Mott insulator:Na2IrO3

2014

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We have investigated the excitation spectra of j eff = 1 2 Mott insulator Na 2 IrO 3 . Taking into account a relativistic multiplet structure of Ir ions, we have calculated the optical conductivity σ (ω) and resonant inelastic x-ray scattering (RIXS) spectra, which manifest different features from those of a canonical j eff = 1 2 system Sr 2 IrO 4 . Distinctly from the two-peak structure in Sr 2 IrO 4 , σ (ω) in Na 2 IrO 3 has a broad single peak dominated by interband transitions from j eff = 3 2 to 1 2 . RIXS spectra exhibit the spin-orbit (SO) exciton that has a two-peak structure arising from the crystal-field effect, and the magnon peak at energies much lower than in Sr 2 IrO 4 . In addition, a small peak near the optical-absorption edge is found in RIXS spectra, originating from the coupling between the electron-hole (e-h) excitation and the SO exciton. Our findings corroborate the validity of the relativistic electronic structure and importance of both itinerant and local features in Na 2 IrO 3 .

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“…Given the defining relations between group generators T 1 , T 2 , C 6 , σ, we can solve for all the possible gauge transformation functions φ O (i)'s compatible with Eq. (6). stands for coefficients for spin-preserving/spin-flipping spinon hopping terms, and u B s/a stands for coefficients for spinpreserving/spin-flipping spinon pairing terms.…”

Section: Projective Symmetry Groupmentioning

confidence: 99%

Non-Kitaev spin liquids in Kitaev materials

Yang

Zhou

et al. 2019

Phys. Rev. B

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We point out that the Kitaev materials may not necessarily support Kitaev spin liquid. It is well-known that having a Kitaev term in the spin interaction is not the sufficient condition for the Kitaev spin liquid ground state. Many other spin liquids may be stabilized by the competing spin interactions of the systems. We thus explore the possibilities of non-Kitaev spin liquids in the honeycomb Kitaev materials. We carry out a systematic classification of gapped Z2 spin liquids using the Schwinger boson representation for the spin variables. The presence of strong spin-orbit coupling in the Kitaev materials brings new ingredients into the projective symmetry group classification of the non-Kitaev spin liquid. We predict the spectroscopic properties of these gapped non-Kitaev spin liquids. Moreover, among the gapped spin liquids that we discover, we identify the spin liquid whose spinon condensation leads to the zig-zag magnetic order that was observed in Na2IrO3 and α-RuCl3. We further discuss the possibility of gapped Z2 spin liquid and the deconfined quantum criticality from the zig-zag magnetic order to spin dimerization in pressurized α-RuCl3.

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Mixing betweenJeff=12and32orbitals in Na

Cited by 51 publications

References 28 publications

High-resolution resonant inelastic x-ray scattering study of the electron-phonon coupling in honeycomb α−Li2IrO3

High-resolution resonant inelastic x-ray scattering study of the electron-phonon coupling in honeycomb α−Li2IrO3

Electronic excitations in the edge-shared relativistic Mott insulator:Na2IrO3

Non-Kitaev spin liquids in Kitaev materials

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