{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,6,15]],"date-time":"2025-06-15T04:05:05Z","timestamp":1749960305216,"version":"3.41.0"},"reference-count":38,"publisher":"IOP Publishing","issue":"4","license":[{"start":{"date-parts":[[2024,8,14]],"date-time":"2024-08-14T00:00:00Z","timestamp":1723593600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/iopscience.iop.org\/page\/copyright"},{"start":{"date-parts":[[2024,8,14]],"date-time":"2024-08-14T00:00:00Z","timestamp":1723593600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"}],"funder":[{"name":"JSPS KAKENHI","award":["21H05233"],"award-info":[{"award-number":["21H05233"]}]},{"name":"National Key Projects for Research and Development of China","award":["2021YFA1400400"],"award-info":[{"award-number":["2021YFA1400400"]}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"crossref","award":["12074173"],"award-info":[{"award-number":["12074173"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"crossref"}]},{"DOI":"10.13039\/501100004608","name":"Natural Science Foundation of Jiangsu Province","doi-asserted-by":"crossref","award":["BK20220066"],"award-info":[{"award-number":["BK20220066"]}],"id":[{"id":"10.13039\/501100004608","id-type":"DOI","asserted-by":"crossref"}]},{"name":"World Premier International Research Center Initiative(WPI), MEXT, Japan"}],"content-domain":{"domain":["iopscience.iop.org"],"crossmark-restriction":false},"short-container-title":["2D Mater."],"published-print":{"date-parts":[[2024,10,1]]},"abstract":"<jats:title>Abstract<\/jats:title>\n               <jats:p>WSe<jats:sub>2<\/jats:sub> is a p-type 2D-semiconductor that can be mechanically exfoliated down to atomic layers. Unlike the Bernal stacked bilayer graphene, the two layers in a bilayer WSe<jats:sub>2<\/jats:sub> flake are weakly coupled. The electric displacement field can easily break the layer degeneracy of the bilayer WSe<jats:sub>2<\/jats:sub>. Together with the strong spin\u2013orbit coupling, it exhibits many novel quantum physical properties. In this work, we fabricate high quality dual-gated bilayer WSe<jats:sub>2<\/jats:sub> devices and observe twofold degenerate Landau levels(LLs) and density-dependent quantum Hall states which show transitions between even and odd filling. When introducing carriers into the system from the valence band edge by gating, two WSe<jats:sub>2<\/jats:sub> layers are filled independently and the bottom layer WSe<jats:sub>2<\/jats:sub> shows negative compressibility at the crossover point. Above 9 T, we observe the degeneracy of LLs is completely broken and there are two sets of LL crossings in the top WSe<jats:sub>2<\/jats:sub> layer at Zeeman-to-cyclotron energy ratio <jats:inline-formula>\n                     <jats:tex-math\/>\n                     <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\">\n                        <mml:mrow>\n                           <mml:msub>\n                              <mml:mi>E<\/mml:mi>\n                              <mml:mi>Z<\/mml:mi>\n                           <\/mml:msub>\n                           <mml:mrow>\n                              <mml:mo>\/<\/mml:mo>\n                           <\/mml:mrow>\n                           <mml:msub>\n                              <mml:mi>E<\/mml:mi>\n                              <mml:mi>N<\/mml:mi>\n                           <\/mml:msub>\n                        <\/mml:mrow>\n                     <\/mml:math>\n                  <\/jats:inline-formula> \u2248\u20094 and <jats:inline-formula>\n                     <jats:tex-math\/>\n                     <mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" overflow=\"scroll\">\n                        <mml:mrow>\n                           <mml:msub>\n                              <mml:mi>E<\/mml:mi>\n                              <mml:mi>Z<\/mml:mi>\n                           <\/mml:msub>\n                           <mml:mrow>\n                              <mml:mo>\/<\/mml:mo>\n                           <\/mml:mrow>\n                           <mml:msub>\n                              <mml:mi>E<\/mml:mi>\n                              <mml:mi>N<\/mml:mi>\n                           <\/mml:msub>\n                        <\/mml:mrow>\n                     <\/mml:math>\n                  <\/jats:inline-formula> \u2248\u20095. The interplay between two LLs from the two WSe<jats:sub>2<\/jats:sub> layers confirms the weak coupling between them. Our results show that the bilayer WSe<jats:sub>2<\/jats:sub> behave like two closely packed independent electronic systems under electric displacement fields.<\/jats:p>","DOI":"10.1088\/2053-1583\/ad6b80","type":"journal-article","created":{"date-parts":[[2024,8,6]],"date-time":"2024-08-06T07:47:55Z","timestamp":1722930475000},"page":"045009","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["Valley landau level crossings in weakly coupled bilayer WSe<sub>2<\/sub>"],"prefix":"10.1088","volume":"11","author":[{"given":"Shiwei","family":"Li","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xinyu","family":"Cao","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Qi","family":"Zhang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yan","family":"Huang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Guangli","family":"Kuang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chuanying","family":"Xi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3701-8119","authenticated-orcid":true,"given":"Kenji","family":"Watanabe","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takashi","family":"Taniguchi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0169-7781","authenticated-orcid":true,"given":"Geliang","family":"Yu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3999-6303","authenticated-orcid":true,"given":"Lei","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"266","published-online":{"date-parts":[[2024,8,14]]},"reference":[{"key":"tdmad6b80bib1","doi-asserted-by":"publisher","DOI":"10.1103\/PhysRevLett.108.196802","volume":"108","author":"Xiao","year":"2012","journal-title":"Phys. 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All rights, including for text and data mining, AI training, and similar technologies, are reserved.","name":"copyright_information","label":"Copyright Information"},{"value":"2024-03-25","name":"date_received","label":"Date Received","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2024-08-04","name":"date_accepted","label":"Date Accepted","group":{"name":"publication_dates","label":"Publication dates"}},{"value":"2024-08-14","name":"date_epub","label":"Online publication date","group":{"name":"publication_dates","label":"Publication dates"}}]}}