Publication Date:
2017-12-19
Description:
Author(s): A. Crepaldi, G. Autès, G. Gatti, S. Roth, A. Sterzi, G. Manzoni, M. Zacchigna, C. Cacho, R. T. Chapman, E. Springate, E. A. Seddon, Ph. Bugnon, A. Magrez, H. Berger, I. Vobornik, M. Kalläne, A. Quer, K. Rossnagel, F. Parmigiani, O. V. Yazyev, and M. Grioni Type-II Weyl semimetals (WSM) are topological materials characterized by special Weyl points (WP) in momentum space where the valence and the conduction band touch. A WSM phase is predicted in MoTe 2 below 250 K, but the WP located in the unoccupied part of the electronic structure has eluded direct observation. By means of time- and angle-resolved photoemission, the authors reveal the fingerprint of the WP in the ultrafast electron dynamics. Electrons that are optically excited into the conduction band relax faster in the WSM phase than in the high-temperature phase or in the topologically trivial sister compound WTe 2 . [Phys. Rev. B 96, 241408(R)] Published Mon Dec 18, 2017
Keywords:
Surface physics, nanoscale physics, low-dimensional systems
Print ISSN:
1098-0121
Electronic ISSN:
1095-3795
Topics:
Physics
Permalink