Spectroscopic signatures of many-body renormalizations in 1T-TiSe2

ORAL

Abstract

We have investigated the many-body renormalization of the single-particle excitations in 1T-TiSe2by employing high resolution angle resolved photoemission spectroscopy (ARPES) measurements. The energy distribution curves of the ARPES data reveal an intrinsic peak-dip-hump feature. The electronic dispersion extracted from the momentum distribution curves highlights, for the first time, multiple kink structures. These are canonical signatures of coupling between the electronic degrees of freedom and bosonic modes in the system. Theoretical modeling of electrons coupled to an Einstein mode provides insight into the peak-dip-hump features observed in the data. From a self- energy analysis of our ARPES data, we find a bosonic mode at 26 meV that correlates with ab-initio phonon-dispersion calculations and observation of Raman active shear (Eg) mode in Raman scattering experiments. The direct observation of band-renormalization due to such electron-boson coupling suggests that such modes could be important for driving charge density wave (CDW) and superconductivity in 1T-TiSe2 like in many other transition metal dichalcogenides.

–

Presenters

  • Utpal Chatterjee

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

Authors

  • Utpal Chatterjee

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

  • Nandini Trivedi

    Ohio State University, Department of Physics, The Ohio State University, Department of Physics, Ohio State University, The Ohio State University, Physics, Ohio State University

  • Kyungmin Lee

    Physics, Ohio State University

  • Goran Karapetrov

    Department of Physics, Drexel University, Drexel University, Physics, Drexel University

  • Junjing Zhao

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