期刊
PHYSICAL REVIEW LETTERS
卷 110, 期 7, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.076402
关键词
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资金
- NSERC
- CFI
- OMRI
- Computational Materials and Chemical Sciences Network (CMCSN) Program of the Division of Materials Science and Engineering, U.S. Department of Energy [DE-SC0007091]
- U.S. DOE Office of Science [DE-AC02-06CH11357]
- DOE, Office of Science, Division of Materials Science [DE-AC02-98CH10886]
- KOFST through the Brainpool Program
- NRF through the ARP [R17-2008-033-01000-0]
- KISTI Supercomputing Center through the strategic support program for supercomputing application research [KSC-2010-S00-0005]
- Erasmus Mundus Eurindia Project
- National Research Foundation of Korea [2008-0060612] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The electronic structure of the honeycomb lattice iridates Na2IrO3 and Li2IrO3 has been investigated using resonant inelastic x-ray scattering (RIXS). Crystal-field-split d-d excitations are resolved in the high-resolution RIXS spectra. In particular, the splitting due to noncubic crystal fields, derived from the splitting of j(eff) = 3/2 states, is much smaller than the typical spin-orbit energy scale in iridates, validating the applicability of jeff physics in A(2)IrO(3). We also find excitonic enhancement of the particle-hole excitation gap around 0.4 eV, indicating that the nearest-neighbor Coulomb interaction could be large. These findings suggest that both Na2IrO3 and Li2IrO3 can be described as spin-orbit Mott insulators, similar to the square lattice iridate Sr2IrO4. DOI: 10.1103/PhysRevLett.110.076402
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