{"title":"Auto-organization of 2H|3R lateral boundaries in bilayer WSe2 grown by chemical vapor deposition","authors":"Gaia Di Berardino, Meryem Bouaziz, Gilles Patriarche, Julien Chaste, Abdelkarim Ouerghi, Fabrice Oehler","doi":"10.1103/physrevb.111.125403","DOIUrl":null,"url":null,"abstract":"Small changes in the structure of thin bidimensional transition metal dichalcogenides (TMDs) can radically alter the overall material properties. Here, we investigate the epitaxial self-organized boundary between two tungsten diselenide domains obtained by chemical vapor deposition: the AB ferroelectric bilayer (noncentrosymmetric, 3</a:mn>R</a:mi></a:mrow></a:math>-like) and the conventional AA' bilayer (centrosymmetric, <b:math xmlns:b=\"http://www.w3.org/1998/Math/MathML\"><b:mrow><b:mn>2</b:mn><b:mi>H</b:mi></b:mrow></b:math>). Several tools are used to isolate and confirm the different polytype signatures, such as micro-Raman, second harmonic generation (SHG) and photoluminescence. Transmission electron microscopy is found to bring complementary information to Raman and SHG in the polytype determination. Finally, we resolve and index a particular sawtooth structure in the experimental <c:math xmlns:c=\"http://www.w3.org/1998/Math/MathML\"><c:mrow><c:mn>2</c:mn><c:mi>H</c:mi><c:mo>|</c:mo><c:mrow><c:mn>3</c:mn><c:mi>R</c:mi></c:mrow></c:mrow></c:math> boundary wall, whose origin is linked to particular twin boundaries observed in other TMDs. <jats:supplementary-material> <jats:copyright-statement>Published by the American Physical Society</jats:copyright-statement> <jats:copyright-year>2025</jats:copyright-year> </jats:permissions> </jats:supplementary-material>","PeriodicalId":20082,"journal":{"name":"Physical Review B","volume":"12 1","pages":""},"PeriodicalIF":3.7000,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physical Review B","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1103/physrevb.111.125403","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"Physics and Astronomy","Score":null,"Total":0}
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Abstract
Small changes in the structure of thin bidimensional transition metal dichalcogenides (TMDs) can radically alter the overall material properties. Here, we investigate the epitaxial self-organized boundary between two tungsten diselenide domains obtained by chemical vapor deposition: the AB ferroelectric bilayer (noncentrosymmetric, 3R-like) and the conventional AA' bilayer (centrosymmetric, 2H). Several tools are used to isolate and confirm the different polytype signatures, such as micro-Raman, second harmonic generation (SHG) and photoluminescence. Transmission electron microscopy is found to bring complementary information to Raman and SHG in the polytype determination. Finally, we resolve and index a particular sawtooth structure in the experimental 2H|3R boundary wall, whose origin is linked to particular twin boundaries observed in other TMDs. Published by the American Physical Society2025
期刊介绍：
Physical Review B (PRB) is the world’s largest dedicated physics journal, publishing approximately 100 new, high-quality papers each week. The most highly cited journal in condensed matter physics, PRB provides outstanding depth and breadth of coverage, combined with unrivaled context and background for ongoing research by scientists worldwide.
PRB covers the full range of condensed matter, materials physics, and related subfields, including:
-Structure and phase transitions
-Ferroelectrics and multiferroics
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-Magnetism
-Superconductivity
-Electronic structure, photonics, and metamaterials
-Semiconductors and mesoscopic systems
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