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Microfocus laser-ARPES on encapsulated mono-, bi-, and few-layer 1T'-WTe\(_2\)

Two-dimensional crystals of semimetallic 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'-WTe\(_2\) and of a quantum spin Hall state in monolayers of the same material. Understanding these phas... Full description

Journal Title: arXiv.org Nov 12, 2018
Main Author: Cucchi, Irène
Other Authors: Gutiérrez-Lezama, Ignacio , Cappelli, Edoardo , Bruno, Flavio , Tenasini, Giulia , Wang, Lin , Ubrig, Nicolas , Barreteau, Céline , Giannini, Enrico , Gibertini, Marco , Tamai, Anna , Morpurgo, Alberto , Baumberger, Felix
Format: Electronic Article Electronic Article
Language: English
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ID: DOI: 10.1021/acs.nanolett.8b04534
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title: Microfocus laser-ARPES on encapsulated mono-, bi-, and few-layer 1T'-WTe\(_2\)
format: Article
creator:
  • Cucchi, Irène
  • Gutiérrez-Lezama, Ignacio
  • Cappelli, Edoardo
  • Bruno, Flavio
  • Tenasini, Giulia
  • Wang, Lin
  • Ubrig, Nicolas
  • Barreteau, Céline
  • Giannini, Enrico
  • Gibertini, Marco
  • Tamai, Anna
  • Morpurgo, Alberto
  • Baumberger, Felix
subjects:
  • Crystal Structure
  • Photoelectric Emission
  • Encapsulation
  • Graphene
  • Contaminants
  • Monolayers
  • Laser Applications
  • Electronic Structure
  • Bilayers
ispartof: arXiv.org, Nov 12, 2018
description: Two-dimensional crystals of semimetallic 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'-WTe\(_2\) and of a quantum spin Hall state in monolayers of the same material. Understanding these phases is particularly challenging because little is known from experiment about the momentum space electronic structure of ultrathin crystals. Here, we report direct electronic structure measurements of exfoliated mono-, bi-, and few-layer 1T'-WTe\(_2\) by laser-based micro-focus angle resolved photoemission. This is achieved by encapsulating with monolayer graphene a flake of WTe\(_2\) comprising regions of different thickness. Our data support the recent identification of a quantum spin Hall state in monolayer 1T'-WTe\(_2\) 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.
language: eng
source:
identifier: DOI: 10.1021/acs.nanolett.8b04534
fulltext: fulltext_linktorsrc
url: Link


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titleMicrofocus laser-ARPES on encapsulated mono-, bi-, and few-layer 1T'-WTe\(_2\)
creatorCucchi, Irène ; Gutiérrez-Lezama, Ignacio ; Cappelli, Edoardo ; Bruno, Flavio ; Tenasini, Giulia ; Wang, Lin ; Ubrig, Nicolas ; Barreteau, Céline ; Giannini, Enrico ; Gibertini, Marco ; Tamai, Anna ; Morpurgo, Alberto ; Baumberger, Felix
contributorBaumberger, Felix (pacrepositoryorg)
ispartofarXiv.org, Nov 12, 2018
identifierDOI: 10.1021/acs.nanolett.8b04534
subjectCrystal Structure ; Photoelectric Emission ; Encapsulation ; Graphene ; Contaminants ; Monolayers ; Laser Applications ; Electronic Structure ; Bilayers
descriptionTwo-dimensional crystals of semimetallic 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'-WTe\(_2\) and of a quantum spin Hall state in monolayers of the same material. Understanding these phases is particularly challenging because little is known from experiment about the momentum space electronic structure of ultrathin crystals. Here, we report direct electronic structure measurements of exfoliated mono-, bi-, and few-layer 1T'-WTe\(_2\) by laser-based micro-focus angle resolved photoemission. This is achieved by encapsulating with monolayer graphene a flake of WTe\(_2\) comprising regions of different thickness. Our data support the recent identification of a quantum spin Hall state in monolayer 1T'-WTe\(_2\) 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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titleMicrofocus laser-ARPES on encapsulated mono-, bi-, and few-layer 1T'-WTe\(_2\)
descriptionTwo-dimensional crystals of semimetallic 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'-WTe\(_2\) and of a quantum spin Hall state in monolayers of the same material. Understanding these phases is particularly challenging because little is known from experiment about the momentum space electronic structure of ultrathin crystals. Here, we report direct electronic structure measurements of exfoliated mono-, bi-, and few-layer 1T'-WTe\(_2\) by laser-based micro-focus angle resolved photoemission. This is achieved by encapsulating with monolayer graphene a flake of WTe\(_2\) comprising regions of different thickness. Our data support the recent identification of a quantum spin Hall state in monolayer 1T'-WTe\(_2\) 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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authorCucchi, Irène ; Gutiérrez-Lezama, Ignacio ; Cappelli, Edoardo ; Bruno, Flavio ; Tenasini, Giulia ; Wang, Lin ; Ubrig, Nicolas ; Barreteau, Céline ; Giannini, Enrico ; Gibertini, Marco ; Tamai, Anna ; Morpurgo, Alberto ; Baumberger, Felix
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abstractTwo-dimensional crystals of semimetallic 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'-WTe\(_2\) and of a quantum spin Hall state in monolayers of the same material. Understanding these phases is particularly challenging because little is known from experiment about the momentum space electronic structure of ultrathin crystals. Here, we report direct electronic structure measurements of exfoliated mono-, bi-, and few-layer 1T'-WTe\(_2\) by laser-based micro-focus angle resolved photoemission. This is achieved by encapsulating with monolayer graphene a flake of WTe\(_2\) comprising regions of different thickness. Our data support the recent identification of a quantum spin Hall state in monolayer 1T'-WTe\(_2\) 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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doi10.1021/acs.nanolett.8b04534
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