Spin-Resolved Electronic Response to the Phase Transition in MoTe<sub>2</sub>

ORAL

Abstract

The Weyl semimetal MoTe2 is studied by spin- and angle-resolved photoemission spectroscopy across the centrosymmetry-breaking structural transition temperature of the bulk. A three-dimensional spin-texture is observed in the bulk Fermi surface in the low temperature, noncentrosymmetric phase that is consistent with first-principles calculations. The spin texture and two types of surface Fermi arc are not completely suppressed above the bulk transition temperature. The lifetimes of quasiparticles forming the Fermi arcs depend on thermal history and lengthen considerably upon cooling toward the bulk structural transition. The results indicate that a new form of polar instability exists near the surface when the bulk is largely in a centrosymmetric phase.

*This work was supported by the Swiss National Science Foundation Project No. PP00P2_144742, No. 200021- 137783, No. PP00P2_170591, NCCR-MARVEL, the Sino-Swiss Science and Technology Cooperation (Grant No. IZLCZ2-170075), DFG (SPP-1666, Project No. MA 4637/3- 1) and the VITI project of the Helmholtz Association.

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Presenters

  • Andrew Weber

    • Donostia International Physics Center

Authors

  • Andrew Weber

    • Donostia International Physics Center

  • Philipp Rüßmann

    • Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA

  • Nan Xu

    • Swiss Light Source, Paul Scherrer Institute

  • Stefan Muff

    • Institute of Physics, École Polytechnique Fédérale de Lausanne

  • Mauro Fanciulli

    • Institute of Physics, École Polytechnique Fédérale de Lausanne

  • Arnaud Magrez

    • Institute of Physics, Ecole Polytechnique Fédéral de Lausanne
    • Institute of Physics, École Polytechnique Fédérale de Lausanne

  • Philippe Bugnon

    • Institute of Physics, École Polytechnique Fédérale de Lausanne

  • Helmuth Berger

    • Institute of Physics, École Polytechnique Fédérale de Lausanne

  • Nicholas C Plumb

    • Swiss Light Source, Paul Scherrer Institute

  • Ming Shi

    • Swiss Light Source, Paul Scherrer Institute

  • Stefan Bluegel

    • Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich, 52425, Jülich, Germany
    • 1Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Julich & JARA
    • Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA

  • Phivos Mavropoulos

    • Peter Grünberg Institut and Institute for Advanced Simulation, Forschungszentrum Jülich and JARA

  • J. Hugo Dil

    • Institute of Physics, École Polytechnique Fédérale de Lausanne