Microfocus Laser-Angle-Resolved Photoemission on Encapsulated Mono-, Bi-, and Few-Layer 1T'-WTe 2
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'-WTe and of a quantum spin Hall state in monolayers of the same material. Understanding these phas...
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| Veröffentlicht in: | Nano letters 2019-01, Vol.19 (1), p.554-560 |
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| container_title | Nano letters |
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| creator | Cucchi, Irène Gutiérrez-Lezama, Ignacio Cappelli, Edoardo McKeown Walker, Siobhan Bruno, Flavio Y Tenasini, Giulia Wang, Lin Ubrig, Nicolas Barreteau, Céline Giannini, Enrico Gibertini, Marco Tamai, Anna Morpurgo, Alberto F Baumberger, Felix |
| description | 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'-WTe
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'-WTe
by laser-based microfocus angle-resolved photoemission. This is achieved by encapsulating with monolayer graphene a flake of WTe
comprising regions of different thickness. Our data support the recent identification of a quantum spin Hall state in monolayer 1T'-WTe
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. |
| doi_str_mv | 10.1021/acs.nanolett.8b04534 |
| format | Article |
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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'-WTe
by laser-based microfocus angle-resolved photoemission. This is achieved by encapsulating with monolayer graphene a flake of WTe
comprising regions of different thickness. Our data support the recent identification of a quantum spin Hall state in monolayer 1T'-WTe
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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'-WTe
by laser-based microfocus angle-resolved photoemission. This is achieved by encapsulating with monolayer graphene a flake of WTe
comprising regions of different thickness. Our data support the recent identification of a quantum spin Hall state in monolayer 1T'-WTe
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.</description><subject>Condensed Matter</subject><subject>Physics</subject><issn>1530-6984</issn><issn>1530-6992</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2019</creationdate><recordtype>article</recordtype><recordid>eNo9kG9LwzAQxoMobk6_gUjfiWBm_rbNyzk2J3QoMvFluDapq3TNaLrJvr0Zc4Pj7rh7noP7IXRLyZASRp-g8MMGGlfbrhumORGSizPUp5ITHCvFzk99KnroyvsfQojiklyiHicyIUyqPoJ5VbSudMXGRxl42-JR811b_GG9q7fWRO9L1zm7qryvXBOFmDQFrP2mhi5s565x-DF6rkKCxkRT-4sz2Nk2oot7_LWwEbtGFyXU3t781wH6nE4W4xnO3l5ex6MMF0zxDicAaZ7mxsZlmjCWQ1xSBVxyy00RC5OoxMQ5t1IUzNgSUibjvBCClDEoIhkfoIfD3SXUet1WK2h32kGlZ6NM72cBmmBMkS0NWnHQht-9b215MlCi93R1oKuPdPU_3WC7O9jWm3xlzcl0xMn_AJIHeAg</recordid><startdate>20190109</startdate><enddate>20190109</enddate><creator>Cucchi, Irène</creator><creator>Gutiérrez-Lezama, Ignacio</creator><creator>Cappelli, Edoardo</creator><creator>McKeown Walker, Siobhan</creator><creator>Bruno, Flavio Y</creator><creator>Tenasini, Giulia</creator><creator>Wang, Lin</creator><creator>Ubrig, Nicolas</creator><creator>Barreteau, Céline</creator><creator>Giannini, Enrico</creator><creator>Gibertini, Marco</creator><creator>Tamai, Anna</creator><creator>Morpurgo, Alberto F</creator><creator>Baumberger, Felix</creator><general>American Chemical Society</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>1XC</scope><orcidid>https://orcid.org/0000-0002-1966-4435</orcidid><orcidid>https://orcid.org/0000-0003-0974-3620</orcidid><orcidid>https://orcid.org/0000-0001-7104-7541</orcidid><orcidid>https://orcid.org/0000-0002-3970-8837</orcidid><orcidid>https://orcid.org/0000-0002-5530-0380</orcidid><orcidid>https://orcid.org/0000-0003-3536-4771</orcidid><orcidid>https://orcid.org/0000-0002-5371-2138</orcidid></search><sort><creationdate>20190109</creationdate><title>Microfocus Laser-Angle-Resolved Photoemission on Encapsulated Mono-, Bi-, and Few-Layer 1T'-WTe 2</title><author>Cucchi, Irène ; Gutiérrez-Lezama, Ignacio ; Cappelli, Edoardo ; McKeown Walker, Siobhan ; Bruno, Flavio Y ; Tenasini, Giulia ; Wang, Lin ; Ubrig, Nicolas ; Barreteau, Céline ; Giannini, Enrico ; Gibertini, Marco ; Tamai, Anna ; Morpurgo, Alberto F ; Baumberger, Felix</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c293t-7aa8b8bde6f8722ba6f19a353e3dc64d797d6b3e54c2defa8256bc440f6a90523</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2019</creationdate><topic>Condensed Matter</topic><topic>Physics</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Cucchi, Irène</creatorcontrib><creatorcontrib>Gutiérrez-Lezama, Ignacio</creatorcontrib><creatorcontrib>Cappelli, Edoardo</creatorcontrib><creatorcontrib>McKeown Walker, Siobhan</creatorcontrib><creatorcontrib>Bruno, Flavio Y</creatorcontrib><creatorcontrib>Tenasini, Giulia</creatorcontrib><creatorcontrib>Wang, Lin</creatorcontrib><creatorcontrib>Ubrig, Nicolas</creatorcontrib><creatorcontrib>Barreteau, Céline</creatorcontrib><creatorcontrib>Giannini, Enrico</creatorcontrib><creatorcontrib>Gibertini, Marco</creatorcontrib><creatorcontrib>Tamai, Anna</creatorcontrib><creatorcontrib>Morpurgo, Alberto F</creatorcontrib><creatorcontrib>Baumberger, Felix</creatorcontrib><collection>PubMed</collection><collection>CrossRef</collection><collection>Hyper Article en Ligne (HAL)</collection><jtitle>Nano letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Cucchi, Irène</au><au>Gutiérrez-Lezama, Ignacio</au><au>Cappelli, Edoardo</au><au>McKeown Walker, Siobhan</au><au>Bruno, Flavio Y</au><au>Tenasini, Giulia</au><au>Wang, Lin</au><au>Ubrig, Nicolas</au><au>Barreteau, Céline</au><au>Giannini, Enrico</au><au>Gibertini, Marco</au><au>Tamai, Anna</au><au>Morpurgo, Alberto F</au><au>Baumberger, Felix</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Microfocus Laser-Angle-Resolved Photoemission on Encapsulated Mono-, Bi-, and Few-Layer 1T'-WTe 2</atitle><jtitle>Nano letters</jtitle><addtitle>Nano Lett</addtitle><date>2019-01-09</date><risdate>2019</risdate><volume>19</volume><issue>1</issue><spage>554</spage><epage>560</epage><pages>554-560</pages><issn>1530-6984</issn><eissn>1530-6992</eissn><abstract>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'-WTe
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by laser-based microfocus angle-resolved photoemission. This is achieved by encapsulating with monolayer graphene a flake of WTe
comprising regions of different thickness. Our data support the recent identification of a quantum spin Hall state in monolayer 1T'-WTe
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.</abstract><cop>United States</cop><pub>American Chemical Society</pub><pmid>30570259</pmid><doi>10.1021/acs.nanolett.8b04534</doi><tpages>7</tpages><orcidid>https://orcid.org/0000-0002-1966-4435</orcidid><orcidid>https://orcid.org/0000-0003-0974-3620</orcidid><orcidid>https://orcid.org/0000-0001-7104-7541</orcidid><orcidid>https://orcid.org/0000-0002-3970-8837</orcidid><orcidid>https://orcid.org/0000-0002-5530-0380</orcidid><orcidid>https://orcid.org/0000-0003-3536-4771</orcidid><orcidid>https://orcid.org/0000-0002-5371-2138</orcidid></addata></record> |
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| subjects | Condensed Matter Physics |
| title | Microfocus Laser-Angle-Resolved Photoemission on Encapsulated Mono-, Bi-, and Few-Layer 1T'-WTe 2 |
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