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27 April 2024 |
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Article overview
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Electronic Evidence for Type II Weyl Semimetal State in MoTe2 | | Aiji Liang
; Jianwei Huang
; Simin Nie
; Ying Ding
; Qiang Gao
; Cheng Hu
; Shaolong He
; Yuxiao Zhang
; Chenlu Wang
; Bing Shen
; Jing Liu
; Ping Ai
; Li Yu
; Xuan Sun
; Wenjuan Zhao
; Shoupeng Lv
; Defa Liu
; Cong Li
; Yan Zhang
; Yong Hu
; Yu Xu
; Lin Zhao
; Guodong Liu
; Zhiqiang Mao
; Xiaowen Jia
; Fengfeng Zhang
; Shenjin Zhang
; Feng Yang
; Zhimin Wang
; Qinjun Peng
; Hongming Weng
; Xi Dai
; Zhong Fang
; Zuyan Xu
; Chuangtian Chen
; X. J. Zhou
; | | Date: |
6 Apr 2016 | | Abstract: | Topological quantum materials, including topological insulators and
superconductors, Dirac semimetals and Weyl semimetals, have attracted much
attention recently for their unique electronic structure, spin texture and
physical properties. Very lately, a new type of Weyl semimetals has been
proposed where the Weyl Fermions emerge at the boundary between electron and
hole pockets in a new phase of matter, which is distinct from the standard type
I Weyl semimetals with a point-like Fermi surface. The Weyl cone in this type
II semimetals is strongly tilted and the related Fermi surface undergos a
Lifshitz transition, giving rise to a new kind of chiral anomaly and other new
physics. MoTe2 is proposed to be a candidate of a type II Weyl semimetal; the
sensitivity of its topological state to lattice constants and correlation also
makes it an ideal platform to explore possible topological phase transitions.
By performing laser-based angle-resolved photoemission (ARPES) measurements
with unprecedentedly high resolution, we have uncovered electronic evidence of
type II semimetal state in MoTe2. We have established a full picture of the
bulk electronic states and surface state for MoTe2 that are consistent with the
band structure calculations. A single branch of surface state is identified
that connects bulk hole pockets and bulk electron pockets. Detailed
temperature-dependent ARPES measurements show high intensity spot-like features
that is ~40 meV above the Fermi level and is close to the momentum space
consistent with the theoretical expectation of the type II Weyl points. Our
results constitute electronic evidence on the nature of the Weyl semimetal
state that favors the presence of two sets of type II Weyl points in MoTe2. | | Source: | arXiv, 1604.1706 | | Services: | Forum | Review | PDF | Favorites | |
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