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| Home > Publications database > Enhanced ultrafast relaxation rate in the Weyl semimetal phase of $MoTe_{2}$ measured by time- and angle-resolved photoelectron spectroscopy |
| Journal Article | PUBDB-2017-13982 |
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2017
Inst.
Woodbury, NY
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Please use a persistent id in citations: doi:10.1103/PhysRevB.96.241408 doi:10.3204/PUBDB-2017-13982
Abstract: $MoTe_2$ has recently been shown to realize in its low-temperature phase the type-II Weyl semimetal (WSM). We investigated by time- and angle- resolved photoelectron spectroscopy (tr-ARPES) the possible influence of the Weyl points on the electron dynamics above the Fermi level $E_F$, by comparing the ultrafast response of $MoTe_2$in the trivial and topological phases. In the low-temperature WSM phase, we report an enhanced relaxation rate of electrons optically excited to the conduction band, which we interpret as a fingerprint of the local gap closure when Weyl points form. By contrast, we find that the electron dynamics of the related compound $WTe_2$is slower and temperature independent, consistent with a topologically trivial nature of this material. Our results shows that tr-ARPES is sensitive to the small modifications of the unoccupied band structure accompanying the structural and topological phase transition of $MoTe_2$.
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