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Experimental observation of topological Fermi arcs in type-II Weyl semimetal MoTe2 | | Ke Deng
; Guoliang Wan
; Peng Deng
; Kenan Zhang
; Shijie Ding
; Eryin Wang
; Mingzhe Yan
; Huaqing Huang
; Hongyun Zhang
; Zhilin Xu
; Jonathan Denlinger
; Alexei Fedorov
; Haitao Yang
; Wenhui Duan
; Hong Yao
; Yang Wu
; y Shoushan Fan
; Haijun Zhang
; Xi Chen
; Shuyun Zhou
; | | Date: |
28 Mar 2016 | | Abstract: | Weyl semimetal is a new quantum state of matter [1-12] hosting the condensed
matter physics counterpart of relativisticWeyl fermion [13] originally
introduced in high energy physics. The Weyl semimetal realized in the TaAs
class features multiple Fermi arcs arising from topological surface states [10,
11, 14-16] and exhibits novel quantum phenomena, e.g., chiral anomaly induced
negative mag-netoresistance [17-19] and possibly emergent supersymmetry [20].
Recently it was proposed theoretically that a new type (type-II) of Weyl
fermion [21], which does not have counterpart in high energy physics due to the
breaking of Lorentz invariance, can emerge as topologically-protected touching
between electron and hole pockets. Here, we report direct spectroscopic
evidence of topological Fermi arcs in the predicted type-II Weyl semimetal
MoTe2 [22-24]. The topological surface states are confirmed by directly
observing the surface states using bulk-and surface-sensitive angle-resolved
photoemission spectroscopy (ARPES), and the quasi-particle interference (QPI)
pattern between the two putative Fermi arcs in scanning tunneling microscopy
(STM). Our work establishes MoTe2 as the first experimental realization of
type-II Weyl semimetal, and opens up new opportunities for probing novel
phenomena such as exotic magneto-transport [21] in type-II Weyl semimetals. | | Source: | arXiv, 1603.8508 | | Services: | Forum | Review | PDF | Favorites | |
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