We combined optical spectroscopy with first principles calculations to reveal the electronic signatures of Ir dimer formation in the q=(1/5,0,1/5) high resistivity phase of IrTe2. Our measurements uncover two interband transitions into the unoccupied dxy antibonding orbital, one from mixed iridium/tellurium bands, the other from the dxy bonding orbital of the dimerized Ir centers. The bonding-antibonding splitting demonstrates that iridium, not tellurium, plays the dominant role in stabilizing the low temperature phase of IrTe2 through localized bonding orbital formation.
|Original language||English (US)|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|State||Published - Jan 7 2015|
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics