Optical evidence for bonding-antibonding splitting in IrTe$_{2}$

ORAL

Abstract

We combined optical spectroscopy with first principles calculations to reveal the electronic signatures of Ir dimer formation in the 1/5th phase of IrTe2. Our measurements uncover two interband transitions into the unoccupied dxy anti-bonding 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.

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Authors

  • Dipanjan Mazumdar

    Southern IL Univ-Carbondale,USA

  • Kristjan Haule

    Rutgers University, Rutgers University, Piscataway, USA, Rutgers, The State University of New Jersey, Rutgers University, Piscataway, NJ, USA, Department of Physics, Rutgers University, Piscataway, New Jersey, USA, Rutgers Univ

  • J.J Yang

    Laboratory for Pohang Emergent Materials and Department of Physics, Korea

  • G.L. Pascut

    Rutgers University, Piscataway, USA

  • B.S. Holinsworth

    University of Tennessee, Knoxville, USA

  • K. R. O'Neal

    University of Tennessee, University of Tennessee, Knoxville, USA

  • V. Kiryukhin

    Rutgers University, Piscataway, USA, Rutgers U.

  • S.-W. Cheong

    Rutgers Center for Emergent Materials and Department of Physics and Astronomy, Piscataway, New Jersey 08854, USA, Rutgers University, Piscataway, USA, Department of Physics and Astronomy, Rutgers University, Rutgers University

  • J.L. Musfeldt

    University of Tennessee, Knoxville, USA