Universität zu Köln

Crepaldi, A., Autes, G., Gatti, G., Roth, S., Sterzi, A., Manzoni, G., Zacchigna, M., Cacho, C., Chapman, R. T., Springate, E., Seddon, E. A., Bugnon, Ph., Magrez, A., Berger, H., Vobornik, I., Kallaene, M., Quer, A., Rossnagel, K., Parmigiani, F., Yazyev, O. V. and Grioni, M. (2017). Enhanced ultrafast relaxation rate in the Weyl semimetal phase of MoTe2 measured by time- and angle-resolved photoelectron spectroscopy. Phys. Rev. B, 96 (24). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

MoTe2 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 EF, by comparing the ultrafast response of MoTe2 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 whenWeyl points form. By contrast, we find that the electron dynamics of the related compound WTe2 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 MoTe2.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Crepaldi, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Autes, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gatti, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Roth, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Sterzi, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Manzoni, G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Zacchigna, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Cacho, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Chapman, R. T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Springate, E. UNSPECIFIED UNSPECIFIED UNSPECIFIED Seddon, E. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bugnon, Ph. UNSPECIFIED UNSPECIFIED UNSPECIFIED Magrez, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Berger, H. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vobornik, I. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kallaene, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Quer, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Rossnagel, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Parmigiani, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Yazyev, O. V. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grioni, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-207807
DOI:	10.1103/PhysRevB.96.241408
Journal or Publication Title:	Phys. Rev. B
Volume:	96
Number:	24
Date:	2017
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language FERMION SEMIMETAL; WTE2; SUPERCONDUCTIVITY; DISCOVERY; NODES; STATE; METAL; ARCS Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/20780