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