Disorder-driven metal-insulator transition in Pt doped 1T-TiSe2

ORAL

Abstract

We have conducted a multipronged investigation, which involves transport, Angle Resolved Photoemission Spectroscopy (ARPES) and Scanning Tunneling Spectroscopy (STS) measurements and theoretical modeling, of pristine and Pt doped 1T-TiSe2, a canonical Charge Density Wave (CDW) material. Transport data finds that at temperatures much lower than CDW transition temperature (TCDW), 1T-TiSe2 shows metallic behavior, while Pt doped samples display insulating behavior. STS reveals the formation of CDW domains with a large Mott gap separated by metallic or semi-metallic domain walls with a small pseudogap. We will present results obtained from a theoretical modeling of transport via the network of domain walls. Our combined study indicates an unconventional disorder-driven metal-insulator transition in Pt doped 1T-TiSe2 samples.

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Presenters

  • Junjing Zhao

    University of Virginia, Department of Physics, University of Virginia, Physics, Univ of Virginia

Authors

  • Kyungmin Lee

    The Ohio State University, Department of Physics, The Ohio State University, Ohio State Univ - Columbus, Ohio State University

  • Nandini Trivedi

    The Ohio State University, Physics, The Ohio State University, Physics, Ohio State Univ - Columbus, Ohio State Univ - Columbus, Physics Department, Ohio State University, Department of Physics, The Ohio State University, Ohio State University, Department of Physics, Ohio State Univ - Columbus

  • Junjing Zhao

    University of Virginia, Department of Physics, University of Virginia, Physics, Univ of Virginia

  • Utpal Chatterjee

    University of Virginia, Department of Physics, University of Virginia, Department of Physics, University of Virgina, Physics, Univ of Virginia

  • Thomas Neulinger

    University of Illinois - Urbana Champaign, Physics, Univeristy of Illinois at Urbana-Champaign

  • Zhenyu Wang

    University of Illinois - Urbana Champaign, Physics, University of Illinois, Physics, Univeristy of Illinois at Urbana-Champaign, Univ of Illinois - Urbana, Department of Physics, University of Illinois, Physics, Univ of Illinois - Urbana, Department of Physics, Univ of Illinois - Urbana-Champaign

  • Vidya Madhavan

    Physics, Univ of Illinois - Urbana, Physics, Univ of Illinois, University of Illinois - Urbana Champaign, Physics, University of Illinois, University of Illinois at Urbana-Champaign, Physics, Univeristy of Illinois at Urbana-Champaign, Univ of Illinois - Urbana, Department of Physics, University of Illinois, Department of Physics, Univ of Illinois - Urbana-Champaign

  • Jesse Choe

    Rice University, Physics & Astronomy, Rice University

  • Chien-Lung Huang

    Physics and Astronomy, Rice University, Rice University

  • Emilia Morosan

    Physics and Astronomy, Rice University, Rice University, Physics & Astronomy, Rice University