Details

Autor(en) / Beteiligte

• Deng, Ke
• Wan, Guoliang
• Deng, Peng
• Zhang, Kenan
• Ding, Shijie
• Wang, Eryin
• Yan, Mingzhe
• Huang, Huaqing
• Zhang, Hongyun
• Xu, Zhilin
• Denlinger, Jonathan
• Fedorov, Alexei
• Yang, Haitao
• Duan, Wenhui
• Yao, Hong
• Wu, Yang
• Fan, Shoushan
• Zhang, Haijun
• Chen, Xi
• Zhou, Shuyun

Titel

Experimental observation of topological Fermi arcs in type-II Weyl semimetal MoTe2

Ist Teil von

• Nature physics, 2016-09, Vol.12 (12), p.1105-1110

Ort / Verlag

London: Nature Publishing Group

Erscheinungsjahr

2016

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Weyl semimetal is a new quantum state of matter1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 hosting the condensed matter physics counterpart of the relativistic Weyl fermions13 originally introduced in high-energy physics. The Weyl semimetal phase realized in the TaAs class of materials features multiple Fermi arcs arising from topological surface states10, 11, 14, 15, 16 and exhibits novel quantum phenomena, such as a chiral anomaly-induced negative magnetoresistance17, 18, 19 and possibly emergent supersymmetry20. Recently it was proposed theoretically that a new type (type-II) of Weyl fermion21, 22 that arises due to the breaking of Lorentz invariance, which does not have a counterpart in high-energy physics, can emerge as topologically protected touching between electron and hole pockets. Here, we report direct experimental evidence of topological Fermi arcs in the predicted type-II Weyl semimetal MoTe2 (refs 23,24,25). The topological surface states are confirmed by directly observing the surface states using bulk- and surface-sensitive angle-resolved photoemission spectroscopy, and the quasi-particle interference pattern between the putative topological Fermi arcs in scanning tunnelling microscopy. By establishing MoTe2 as an experimental realization of a type-II Weyl semimetal, our work opens up opportunities for probing the physical properties of this exciting new state.