Localization of lattice dynamics in low-angle twisted bilayer graphene

Página do item simplificado
dc.creatorAndreij de Carvalho Gadelha
dc.creatorRafael Battistella Nadas
dc.creatorFabiano Costa Santana
dc.creatorKenji Watanabe
dc.creatorTakashi Taniguchi
dc.creatorBenoit van Troeye
dc.creatorMichael Lamparski
dc.creatorVincent Meunier
dc.creatorViet-Hung Nguyen
dc.creatorDawid Paszko
dc.creatorJean-Christophe Charlier
dc.creatorDouglas August Alexander Ohlberg
dc.creatorLeonardo Cristiano Campos
dc.creatorLuiz Gustavo de Oliveira Lopes Cançado
dc.creatorGilberto Medeiros Ribeiro
dc.creatorAdo Jorio de Vasconcelos
dc.creatorCassiano Rabelo e Silva
dc.creatorEliel Gomes da Silva Neto
dc.creatorThiago de Lourenço e Vasconcelos
dc.creatorJoão Luiz Elias Campos
dc.creatorJéssica Santos Lemos
dc.creatorVinícius Ornelas da Silva
dc.creatorDaniel de Abreu Miranda
dc.date.accessioned2025-02-24T18:01:50Z
dc.date.accessioned2025-09-09T00:35:32Z
dc.date.available2025-02-24T18:01:50Z
dc.date.issued2021
dc.description.sponsorshipCNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico
dc.description.sponsorshipFAPEMIG - Fundação de Amparo à Pesquisa do Estado de Minas Gerais
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
dc.description.sponsorshipINCT – Instituto nacional de ciência e tecnologia (Antigo Instituto do Milênio)
dc.identifier.doihttps://doi.org/10.1038/s41586-021-03252-5
dc.identifier.issn1476-4687
dc.identifier.urihttps://hdl.handle.net/1843/80355
dc.languageeng
dc.publisherUniversidade Federal de Minas Gerais
dc.relation.ispartofNature
dc.rightsAcesso Restrito
dc.subjectEspectroscopia de Raman
dc.subjectCrystal lattices
dc.subjectSupercondutividade
dc.subjectPropriedades mecânicas
dc.subjectPropriedades estruturais
dc.subjectNanofotônica
dc.subjectPropriedades ópticas
dc.subject.otherTip-enhanced Raman spectroscopy
dc.subject.otherTwisted bilayer graphene
dc.subject.otherCrystal lattice
dc.subject.otherNanospectroscopy
dc.subject.otherSuperconductivity
dc.subject.otherMagic angle
dc.subject.otherMechanical and structural properties and devices
dc.subject.otherNanophotonics and plasmonics
dc.subject.otherOptical properties and devices
dc.titleLocalization of lattice dynamics in low-angle twisted bilayer graphene
dc.typeArtigo de periódico
local.citation.epage409
local.citation.spage405
local.citation.volume590
local.description.resumoTwisted bilayer graphene is created by slightly rotating the two crystal networks in bilayer graphene with respect to each other. For small twist angles, the material undergoes a self-organized lattice reconstruction, leading to the formation of a periodically repeated domain. The resulting superlattice modulates the vibrational and electronic structures within the material, leading to changes in the behaviour of electron–phonon coupling and to the observation of strong correlations and superconductivity. However, accessing these modulations and understanding the related effects are challenging, because the modulations are too small for experimental techniques to accurately resolve the relevant energy levels and too large for theoretical models to properly describe the localized effects. Here we report hyperspectral optical images, generated by a nano-Raman spectroscope of the crystal superlattice in reconstructed (low-angle) twisted bilayer graphene. Observations of the crystallographic structure with visible light are made possible by the nano-Raman technique, which reveals the localization of lattice dynamics, with the presence of strain solitons and topological points1 causing detectable spectral variations. The results are rationalized by an atomistic model that enables evaluation of the local density of the electronic and vibrational states of the superlattice. This evaluation highlights the relevance of solitons and topological points for the vibrational and electronic properties of the structures, particularly for small twist angles. Our results are an important step towards understanding phonon-related effects at atomic and nanometric scales, such as Jahn–Teller effects and electronic Cooper pairing and may help to improve device characterization in the context of the rapidly developing field of twistronics.
local.identifier.orcidhttps://orcid.org/0000-0002-6350-7680
local.identifier.orcidhttps://orcid.org/0000-0001-6165-5981
local.identifier.orcidhttps://orcid.org/0000-0002-2169-5521
local.identifier.orcidhttps://orcid.org/0000-0003-3701-8119
local.identifier.orcidhttps://orcid.org/0000-0002-1467-3105
local.identifier.orcidhttps://orcid.org/0000-0003-3800-6793
local.identifier.orcidhttps://orcid.org/0000-0002-7013-179X
local.identifier.orcidhttps://orcid.org/0000-0001-6729-3520
local.identifier.orcidhttps://orcid.org/0000-0002-3346-1554
local.identifier.orcidhttps://orcid.org/0000-0002-5749-1328
local.identifier.orcidhttps://orcid.org/0000-0003-1634-0264
local.identifier.orcidhttps://orcid.org/0000-0001-6792-7554
local.identifier.orcidhttps://orcid.org/0000-0003-0816-0888
local.identifier.orcidhttps://orcid.org/0000-0001-5309-2488
local.identifier.orcidhttps://orcid.org/0000-0002-5978-2735
local.identifier.orcidhttps://orcid.org/0000-0003-0488-2242
local.identifier.orcidhttps://orcid.org/0000-0002-4658-3243
local.identifier.orcidhttps://orcid.org/0000-0003-0195-444X
local.identifier.orcidhttps://orcid.org/0000-0002-8071-0525
local.identifier.orcidhttps://orcid.org/0000-0002-9493-9240
local.identifier.orcidhttps://orcid.org/0000-0002-3636-7272
local.identifier.orcidhttps://orcid.org/0000-0002-9784-3340
local.publisher.countryBrasil
local.publisher.departmentICX - DEPARTAMENTO DE CIÊNCIA DA COMPUTAÇÃO
local.publisher.departmentICX - DEPARTAMENTO DE FÍSICA
local.publisher.initialsUFMG
local.url.externahttps://www.nature.com/articles/s41586-021-03252-5#citeas

Arquivos

Licença do pacote

Agora exibindo 1 - 1 de 1
Imagem de Miniatura
Nome:
License.txt
Tamanho:
1.99 KB
Formato:
Plain Text
Descrição:
Baixar

Coleções

Artigo de Periódico

Logo UFMG