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Article: Correlated states in twisted double bilayer graphene

TitleCorrelated states in twisted double bilayer graphene
Authors
KeywordsDegrees of freedom (mechanics)
Quantum theory
Spin polarization
Bilayer Graphene
Degree of freedom
Issue Date2020
PublisherNature Publishing Group. The Journal's web site is located at http://npg.nature.com/npg/servlet/Form?_action=submit
Citation
Nature Physics, 2020, v. 16 n. 5, p. 520-525 How to Cite?
AbstractElectron–electron interactions play an important role in graphene and related systems and can induce exotic quantum states, especially in a stacked bilayer with a small twist angle1,2,3,4,5,6,7. For bilayer graphene where the two layers are twisted by the ‘magic angle’, flat band and strong many-body effects lead to correlated insulating states and superconductivity4,5,6,7. In contrast to monolayer graphene, the band structure of untwisted bilayer graphene can be further tuned by a displacement field8,9,10, providing an extra degree of freedom to control the flat band that should appear when two bilayers are stacked on top of each other. Here, we report the discovery and characterization of displacement field-tunable electronic phases in twisted double bilayer graphene. We observe insulating states at a half-filled conduction band in an intermediate range of displacement fields. Furthermore, the resistance gap in the correlated insulator increases with respect to the in-plane magnetic fields and we find that the g factor, according to the spin Zeeman effect, is ~2, indicating spin polarization at half-filling. These results establish twisted double bilayer graphene as an easily tunable platform for exploring quantum many-body states.
Persistent Identifierhttp://hdl.handle.net/10722/285491
ISSN
2019 Impact Factor: 19.256
2015 SCImago Journal Rankings: 13.522
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorShen, C-
dc.contributor.authorChu, Y-
dc.contributor.authorWu, Q-
dc.contributor.authorLi, N-
dc.contributor.authorWang, S-
dc.contributor.authorZhao, Y-
dc.contributor.authorTang, J-
dc.contributor.authorLiu, J-
dc.contributor.authorTian, J-
dc.contributor.authorWatanabe, K-
dc.contributor.authorTaniguchi, T-
dc.contributor.authorYang, R-
dc.contributor.authorMeng, ZY-
dc.contributor.authorShi, D-
dc.contributor.authorYazyev, OV-
dc.contributor.authorZhang, G-
dc.date.accessioned2020-08-18T03:53:56Z-
dc.date.available2020-08-18T03:53:56Z-
dc.date.issued2020-
dc.identifier.citationNature Physics, 2020, v. 16 n. 5, p. 520-525-
dc.identifier.issn1745-2473-
dc.identifier.urihttp://hdl.handle.net/10722/285491-
dc.description.abstractElectron–electron interactions play an important role in graphene and related systems and can induce exotic quantum states, especially in a stacked bilayer with a small twist angle1,2,3,4,5,6,7. For bilayer graphene where the two layers are twisted by the ‘magic angle’, flat band and strong many-body effects lead to correlated insulating states and superconductivity4,5,6,7. In contrast to monolayer graphene, the band structure of untwisted bilayer graphene can be further tuned by a displacement field8,9,10, providing an extra degree of freedom to control the flat band that should appear when two bilayers are stacked on top of each other. Here, we report the discovery and characterization of displacement field-tunable electronic phases in twisted double bilayer graphene. We observe insulating states at a half-filled conduction band in an intermediate range of displacement fields. Furthermore, the resistance gap in the correlated insulator increases with respect to the in-plane magnetic fields and we find that the g factor, according to the spin Zeeman effect, is ~2, indicating spin polarization at half-filling. These results establish twisted double bilayer graphene as an easily tunable platform for exploring quantum many-body states.-
dc.languageeng-
dc.publisherNature Publishing Group. The Journal's web site is located at http://npg.nature.com/npg/servlet/Form?_action=submit-
dc.relation.ispartofNature Physics-
dc.rightsThis is a post-peer-review, pre-copyedit version of an article published in Nature Physics. The final authenticated version is available online at: https://doi.org/10.1038/s41567-020-0825-9-
dc.subjectDegrees of freedom (mechanics)-
dc.subjectQuantum theory-
dc.subjectSpin polarization-
dc.subjectBilayer Graphene-
dc.subjectDegree of freedom-
dc.titleCorrelated states in twisted double bilayer graphene-
dc.typeArticle-
dc.identifier.emailMeng, ZY: zymeng@hku.hk-
dc.identifier.authorityMeng, ZY=rp02524-
dc.description.naturepostprint-
dc.identifier.doi10.1038/s41567-020-0825-9-
dc.identifier.scopuseid_2-s2.0-85082934895-
dc.identifier.hkuros312867-
dc.identifier.volume16-
dc.identifier.issue5-
dc.identifier.spage520-
dc.identifier.epage525-
dc.identifier.isiWOS:000522383200002-
dc.publisher.placeUnited Kingdom-
dc.identifier.issnl1745-2473-

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