期刊
NANO LETTERS
卷 19, 期 1, 页码 554-560出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b04534
关键词
van der Waals heterostructures; electronic structure; nano-ARPES; 1T '-WTe2
类别
资金
- Swiss National Science Foundation (SNSF) Div. II
- SNSF Synergia program
- NCCR QSIT
- EU Graphene Flagship
- SNSF
- CSCS [s825]
Two-dimensional crystals of semi-metallic van der Waals materials hold much potential for the realization of novel phases, as exemplified by the recent discoveries of a polar metal in few-layer 1T'-WTe2 and of a quantum spin Hall state in monolayers of the same material. Understanding these phases is particularly challenging because little is known from experiments about the momentum space electronic structure of ultrathin crystals. Here, we report direct electronic structure measurements of exfoliated mono-, bi-, and few-layer 1T'-WTe2 by laser-based microfocus angle-resolved photoemission. This is achieved by encapsulating with monolayer graphene a flake of WTe2 comprising regions of different thickness. Our data support the recent identification of a quantum spin Hall state in monolayer 1T'-WTe2 and reveal strong signatures of the broken inversion symmetry in the bilayer. We finally discuss the sensitivity of encapsulated samples to contaminants following exposure to ambient atmosphere.
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