Infrared micro-spectroscopy of strained VO$_2$ micro-crystals

ORAL

Abstract

The temperature-driven insulator-to-metal transition (IMT) in vanadium dioxide (VO$_2$) is accompanied by a structural instability (SI). The IMT and SI lead to a drastic change in the electronic properties, crystal structure, and lattice dynamics. We performed infrared micro-spectroscopy on single crystal platelets of VO$_2$ deposited on oxidized silicon substrate by physical vapor deposition. The firm attachment of these micro-crystals to the substrate causes strain which can alter their properties compared to bulk samples. We report infrared data on these micro-crystals and demonstrate both their electronic and phonon properties in the monoclinic M1 phase and the rutile phase. We also compare their infrared conductivity to that of bulk single crystals and thin films. Finally, we compare infrared-active phonon features to first-principles density functional theory calculations.

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Authors

  • Mumtaz Qazilbash

    Department of Physics, College of William and Mary, College of William and Mary

  • Tyler Huffman

    Department of Physics, College of William and Mary, College of William and Mary

  • Eric J. Walter

    College of William and Mary, Department of Physics, College of William and Mary

  • Henry Krakauer

    College of William and Mary, Department of Physics, College of William and Mary

  • Jiang Wei

    Rice University, Department of Physics, University of Washington, Seattle

  • D.H. Cobden

    Department of Physics, University of Washington, Seattle, University of Washington, Department of Physics, University of Washington

  • H.A. Bechtel

    Advanced Light Source, Lawrence Berkeley National Laboratory

  • M.C. Martin

    Advanced Light Source, Lawrence Berkeley National Laboratory

  • G.L. Carr

    Photon Sciences, Brookhaven National Laboratory, Brookhaven National Laboratory, National Synchrotron Light Source, Brookhaven National Laboratory

  • Dmitri Basov

    UCSD, University of California, San Diego, University of California San Diego, Department of Physics, University of California, San Diego