Dynamics of out-of-equilibrium electron and hole pockets in the type-II Weyl semimetal candidate WTe2

M. Caputo, L. Khalil, E. Papalazarou, N. Nilforoushan, L. Perfetti, A. Taleb-Ibrahimi, Q. D. Gibson, R. J. Cava, M. Marsi

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Abstract

We present a time- and angle-resolved photoemission study of the transition-metal dichalcogenide WTe2, a candidate type-II Weyl semimetal exhibiting extremely large magnetoresistence. Using femtosecond light pulses, we characterize the unoccupied states of the electron pockets above the Fermi level. Following the ultrafast carrier relaxation in distinct parts of the Brillouin zone, we report remarkably similar decay dynamics for electrons and holes. Our results confirm that charge compensation between electron and hole pockets - a key effect to explain the nonsaturating magnetoresistance of this material - is a distinctive feature of WTe2 even in an out-of-equilibrium regime.

Original languageEnglish (US)
Article number115115
JournalPhysical Review B
Volume97
Issue number11
DOIs
StatePublished - Mar 8 2018

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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    Caputo, M., Khalil, L., Papalazarou, E., Nilforoushan, N., Perfetti, L., Taleb-Ibrahimi, A., Gibson, Q. D., Cava, R. J., & Marsi, M. (2018). Dynamics of out-of-equilibrium electron and hole pockets in the type-II Weyl semimetal candidate WTe2. Physical Review B, 97(11), [115115]. https://doi.org/10.1103/PhysRevB.97.115115