Manipulation of electron-phonon energy transfer pathways in 2D transition metal dichalcogenides through ultrafast excitation

ORAL

Abstract

The complex phase landscape of quantum materials provides tremendous opportunity for design, manipulation, and coherent control of material properties using light. Understanding that complexity also poses a significant challenge, and multiple techniques are needed to map and exploit the rich phase space of strongly correlated materials. For example, using ultrafast electron calorimetry via time- and angle-resolved photoemission (ARPES), a bi-directional energy transfer between strongly-correlated electron and phonon modes in a material has been observed for the first time - in this case a charge density wave (CDW) material 1T-TaSe2.

Here we use visible pump-probe spectroscopy to further explore and manipulate the couplings between the electron and phonon systems. By varying the pump fluence, we can alter the relative coupling strength of multiple phonon modes, demonstrating the use of light to control material properties and select available vibrational relaxation pathways in quantum materials.

–

Presenters

  • Emma Cating-Subramanian

    JILA, University of Colorado Boulder

Authors

  • Emma Cating-Subramanian

    JILA, University of Colorado Boulder

  • Christian Gentry

    JILA, University of Colorado Boulder, JILA, Department of Physics and JILA, University of Colorado, Boulder

  • Xun Shi

    JILA, University of Colorado Boulder, Department of Physics and JILA, University of Colorado, Boulder, University of Colorado, Boulder

  • Yingchao Zhang

    JILA, University of Colorado Boulder, Department of Physics and JILA, University of Colorado, Boulder, University of Colorado, Boulder

  • Wenjing You

    JILA, University of Colorado Boulder, Department of Physics and JILA, University of Colorado, Boulder, University of Colorado, Boulder

  • Sinead Ryan

    JILA, University of Colorado Boulder, JILA, Department of Physics and JILA, University of Colorado, Boulder

  • Baldwin Akin Varner

    Norfolk State University

  • Kai Rossnagel

    Christian-Albrechts-Universitat zu Kiel, Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany, Institute of Experimental and Applied Physics, Kiel University, Kiel University, University of Kiel

  • Henry Kapteyn

    JILA, University of Colorado Boulder, Department of Physics and JILA, University of Colorado, Boulder, STROBE and JILA, University of Colorado, Boulder, JILA and Department of Physics, University of Colorado, Boulder, STROBE and JILA, University of Colorado and NIST, Physics, JILA/University of Colorado Boulder, JILA, University of Colorado, Boulder, Physics and JILA, CU Boulder, JILA, University of Colorado, Boulder

  • Margaret Murnane

    JILA, University of Colorado Boulder, Department of Physics and JILA, University of Colorado, Boulder, STROBE and JILA, University of Colorado, Boulder, STROBE and JILA, University of Colorado and NIST, JILA, University of Colorado, Boulder, Physics and JILA, CU Boulder, University of Colorado, JILA, University of Colorado, Boulder