Observation of logarithmic Kohn anomaly in monolayer graphene

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dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorZhao, Yanchongen_US
dc.contributor.authorDu, Luojunen_US
dc.contributor.authorYang, Weien_US
dc.contributor.authorShen, Chengen_US
dc.contributor.authorTang, Jianen_US
dc.contributor.authorLi, Xiaomeien_US
dc.contributor.authorChu, Yanbangen_US
dc.contributor.authorTian, Jinpengen_US
dc.contributor.authorWatanabe, Kenjien_US
dc.contributor.authorTaniguchi, Takashien_US
dc.contributor.authorYang, Rongen_US
dc.contributor.authorShi, Dongxiaen_US
dc.contributor.authorSun, Zhipeien_US
dc.contributor.authorZhang, Guangyuen_US
dc.contributor.departmentDepartment of Electronics and Nanoengineeringen
dc.contributor.groupauthorCentre of Excellence in Quantum Technology, QTFen
dc.contributor.groupauthorZhipei Sun Groupen
dc.contributor.organizationChinese Academy of Sciencesen_US
dc.contributor.organizationNational Institute for Materials Scienceen_US
dc.date.accessioned2020-11-30T08:17:31Z
dc.date.available2020-11-30T08:17:31Z
dc.date.issued2020-10-23en_US
dc.description| openaire: EC/H2020/820423/EU//S2QUIP | openaire: EC/H2020/834742/EU//ATOP
dc.description.abstractElectron-phonon coupling in monolayer graphene breaks the adiabatic Born-Oppenheimer approximation and could lead to exotic logarithmic Kohn anomaly, manifested as logarithmic singularity in optical-phonon energy. However, unraveling unambiguously the fascinating logarithmic Kohn anomaly in monolayer graphene remains challenging due to the large carrier inhomogeneity originating from the unique massless Dirac-like band dispersion and the underneath substrate doping effect. Here we demonstrate a clear signature of intriguing logarithmic Kohn anomaly in monolayer graphene with ultralow carrier inhomogeneity via h-BN encapsulation. Significantly, the magnitude of anomalous phonon softening at 25 K shows an enhancement factor of 2 as compared to that previously observed in bilayer graphene at 12 K, even though bilayer graphene with nearly parabolic band dispersion is more immune to charged impurities. The uncovered unusual logarithmic Kohn anomaly in monolayer graphene can provide a firm basis for the understanding of various peculiar physics and may shed light on the nature of superconductivity in magic-angle graphene superlattices.en
dc.description.versionPeer revieweden
dc.format.extent6
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationZhao, Y, Du, L, Yang, W, Shen, C, Tang, J, Li, X, Chu, Y, Tian, J, Watanabe, K, Taniguchi, T, Yang, R, Shi, D, Sun, Z & Zhang, G 2020, ' Observation of logarithmic Kohn anomaly in monolayer graphene ', Physical Review B, vol. 102, no. 16, 165415 . https://doi.org/10.1103/PhysRevB.102.165415en
dc.identifier.doi10.1103/PhysRevB.102.165415en_US
dc.identifier.issn2469-9950
dc.identifier.issn2469-9969
dc.identifier.otherPURE UUID: a3aa71f1-3e28-4dae-b22e-00349d6e856fen_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/a3aa71f1-3e28-4dae-b22e-00349d6e856fen_US
dc.identifier.otherPURE LINK: http://www.scopus.com/inward/record.url?scp=85095118845&partnerID=8YFLogxKen_US
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/53403109/Zhao_Observation_of_logarithmic_PhysRevB.pdfen_US
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/61765
dc.identifier.urnURN:NBN:fi:aalto-2020113020610
dc.language.isoenen
dc.publisherAmerican Physical Society
dc.relationinfo:eu-repo/grantAgreement/EC/H2020/834742/EU//ATOPen_US
dc.relation.ispartofseriesPhysical Review Ben
dc.relation.ispartofseriesVolume 102, issue 16en
dc.rightsopenAccessen
dc.titleObservation of logarithmic Kohn anomaly in monolayer grapheneen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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