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Article: A family of finite-temperature electronic phase transitions in graphene multilayers

TitleA family of finite-temperature electronic phase transitions in graphene multilayers
Authors
Issue Date2018
PublisherAmerican Association for the Advancement of Science. The Journal's web site is located at http://sciencemag.org
Citation
Science, 2018, v. 362 n. 6412, p. 324-328 How to Cite?
AbstractSuspended Bernal-stacked graphene multilayers up to an unexpectedly large thickness exhibit a broken-symmetry ground state whose origin remains to be understood. We show that a finite-temperature second-order phase transition occurs in multilayers whose critical temperature (Tc) increases from 12 kelvins (K) in bilayers to 100 K in heptalayers. A comparison of the data with a phenomenological model inspired by a mean-field approach suggests that the transition is associated with the appearance of a self-consistent valley- and spin-dependent staggered potential that changes sign from one layer to the next, appearing at Tc and increasing upon cooling. The systematic evolution with thickness of several measured quantities imposes constraints on any microscopic theory aiming to analyze the nature of electronic correlations in this system.
Persistent Identifierhttp://hdl.handle.net/10722/265118
ISSN
2020 Impact Factor: 47.728
2020 SCImago Journal Rankings: 12.556
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorNam, Y-
dc.contributor.authorKi, D-
dc.contributor.authorSoler-Delgado, D-
dc.contributor.authorMorpurgo, A-
dc.date.accessioned2018-11-20T02:00:32Z-
dc.date.available2018-11-20T02:00:32Z-
dc.date.issued2018-
dc.identifier.citationScience, 2018, v. 362 n. 6412, p. 324-328-
dc.identifier.issn0036-8075-
dc.identifier.urihttp://hdl.handle.net/10722/265118-
dc.description.abstractSuspended Bernal-stacked graphene multilayers up to an unexpectedly large thickness exhibit a broken-symmetry ground state whose origin remains to be understood. We show that a finite-temperature second-order phase transition occurs in multilayers whose critical temperature (Tc) increases from 12 kelvins (K) in bilayers to 100 K in heptalayers. A comparison of the data with a phenomenological model inspired by a mean-field approach suggests that the transition is associated with the appearance of a self-consistent valley- and spin-dependent staggered potential that changes sign from one layer to the next, appearing at Tc and increasing upon cooling. The systematic evolution with thickness of several measured quantities imposes constraints on any microscopic theory aiming to analyze the nature of electronic correlations in this system.-
dc.languageeng-
dc.publisherAmerican Association for the Advancement of Science. The Journal's web site is located at http://sciencemag.org-
dc.relation.ispartofScience-
dc.rightsScience. Copyright © American Association for the Advancement of Science.-
dc.rightsThis is the author’s version of the work. It is posted here by permission of the AAAS for personal use, not for redistribution. The definitive version was published in Science on v. 362(6412), 19 Oct 2018, DOI: 10.1126/science.aar6855-
dc.titleA family of finite-temperature electronic phase transitions in graphene multilayers-
dc.typeArticle-
dc.identifier.emailKi, D: dkki@hku.hk-
dc.identifier.authorityKi, D=rp02444-
dc.description.naturepostprint-
dc.identifier.doi10.1126/science.aar6855-
dc.identifier.scopuseid_2-s2.0-85055073479-
dc.identifier.hkuros295864-
dc.identifier.volume362-
dc.identifier.issue6412-
dc.identifier.spage324-
dc.identifier.epage328-
dc.identifier.isiWOS:000447680100044-
dc.publisher.placeUnited States-
dc.identifier.issnl0036-8075-

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