Publicação
Topological magnons in CrI3 monolayers: an itinerant fermion description
| Resumo: | Magnons dominate the magnetic response of ferromagnetic two-dimensional crystals such as CrI3. Because of the arrangement of Cr spins in a honeycomb lattice, magnons in CrI3 bear a strong resemblance with electrons in graphene. Neutron scattering experiments carried out in bulk CrI3 show the existence of a gap at the Dirac points, conjectured to have a topological nature. We propose a theory for magnons in CrI3 monolayers based on an itinerant fermion picture, with a Hamiltonian derived from first principles. We obtain the magnon dispersion for 2D CrI3 with a gap at the Dirac points with the same Berry curvature in both valleys. For CrI3 ribbons, we find chiral in-gap edge states. Analysis of the magnon wave functions in momentum space confirms their topological nature. Importantly, our approach does not require a spin Hamiltonian, and can be applied to insulating and conducting 2D materials with any type of magnetic order. |
|---|---|
| Autores principais: | Costa, A. T. |
| Outros Autores: | Santos, D. L. R.; Peres, N. M. R.; Fernández-Rossier, J. |
| Assunto: | 2D magnets Fermionic Hamiltonian Magnons Topological matter Trihalides Van der Waals magnets |
| Ano: | 2020 |
| País: | Portugal |
| Tipo de documento: | artigo |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade do Minho |
| Idioma: | inglês |
| Origem: | RepositóriUM - Universidade do Minho |
| _version_ | 1866875519766626304 |
|---|---|
| author | Costa, A. T. |
| author2 | Santos, D. L. R. Peres, N. M. R. Fernández-Rossier, J. |
| author2_role | author author author |
| author_facet | Costa, A. T. Santos, D. L. R. Peres, N. M. R. Fernández-Rossier, J. |
| author_role | author |
| contributor_name_str_mv | Universidade do Minho |
| country_str | PT |
| creators_json_txt | [{\"Person.name\":\"Costa, A. T.\"},{\"Person.name\":\"Santos, D. L. R.\"},{\"Person.name\":\"Peres, N. M. R.\"},{\"Person.name\":\"Fernández-Rossier, J.\"}] |
| datacite.contributors.contributor.contributorName.fl_str_mv | Universidade do Minho |
| datacite.creators.creator.creatorName.fl_str_mv | Costa, A. T. Santos, D. L. R. Peres, N. M. R. Fernández-Rossier, J. |
| datacite.date.Accepted.fl_str_mv | 2020-09-01T00:00:00Z |
| datacite.date.available.fl_str_mv | 2020-12-11T16:40:25Z |
| datacite.date.embargoed.fl_str_mv | 2020-12-11T16:40:25Z |
| datacite.rights.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| datacite.subjects.subject.fl_str_mv | 2D magnets Fermionic Hamiltonian Magnons Topological matter Trihalides Van der Waals magnets |
| datacite.titles.title.fl_str_mv | Topological magnons in CrI3 monolayers: an itinerant fermion description |
| dc.contributor.none.fl_str_mv | Universidade do Minho |
| dc.creator.none.fl_str_mv | Costa, A. T. Santos, D. L. R. Peres, N. M. R. Fernández-Rossier, J. |
| dc.date.Accepted.fl_str_mv | 2020-09-01T00:00:00Z |
| dc.date.available.fl_str_mv | 2020-12-11T16:40:25Z |
| dc.date.embargoed.fl_str_mv | 2020-12-11T16:40:25Z |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.none.fl_str_mv | https://hdl.handle.net/1822/68513 |
| dc.language.none.fl_str_mv | eng |
| dc.publisher.none.fl_str_mv | IOP Publishing Ltd |
| dc.rights.none.fl_str_mv | http://purl.org/coar/access_right/c_abf2 |
| dc.subject.none.fl_str_mv | 2D magnets Fermionic Hamiltonian Magnons Topological matter Trihalides Van der Waals magnets |
| dc.title.fl_str_mv | Topological magnons in CrI3 monolayers: an itinerant fermion description |
| dc.type.none.fl_str_mv | http://purl.org/coar/resource_type/c_6501 |
| description | Magnons dominate the magnetic response of ferromagnetic two-dimensional crystals such as CrI3. Because of the arrangement of Cr spins in a honeycomb lattice, magnons in CrI3 bear a strong resemblance with electrons in graphene. Neutron scattering experiments carried out in bulk CrI3 show the existence of a gap at the Dirac points, conjectured to have a topological nature. We propose a theory for magnons in CrI3 monolayers based on an itinerant fermion picture, with a Hamiltonian derived from first principles. We obtain the magnon dispersion for 2D CrI3 with a gap at the Dirac points with the same Berry curvature in both valleys. For CrI3 ribbons, we find chiral in-gap edge states. Analysis of the magnon wave functions in momentum space confirms their topological nature. Importantly, our approach does not require a spin Hamiltonian, and can be applied to insulating and conducting 2D materials with any type of magnetic order. |
| dirty | 0 |
| eu_rights_str_mv | openAccess |
| format | article |
| fulltext.url.fl_str_mv | https://prod-dspace.uminho.pt/bitstreams/ebf20f59-f703-4a9a-bc6e-248016ba6bd1/download |
| id | rum_2a8d03c2ca16e2673662e1b94cdff8d7 |
| identifier.url.fl_str_mv | https://hdl.handle.net/1822/68513 |
| instacron_str | repositorium |
| institution | Universidade do Minho |
| instname_str | Universidade do Minho |
| language | eng |
| network_acronym_str | rum |
| network_name_str | RepositóriUM - Universidade do Minho |
| oai_identifier_str | oai:repositorium.uminho.pt:1822/68513 |
| organization_str_mv | urn:organizationAcronym:repositorium |
| person_str_mv | Costa, A. T. Santos, D. L. R. Peres, N. M. R. Fernández-Rossier, J. |
| publishDate | 2020 |
| publisher.none.fl_str_mv | IOP Publishing Ltd |
| reponame_str | RepositóriUM - Universidade do Minho |
| repository_id_str | urn:repositoryAcronym:rum |
| service_str_mv | urn:repositoryAcronym:rum |
| spelling | engIOP Publishing LtdporMagnons dominate the magnetic response of ferromagnetic two-dimensional crystals such as CrI3. Because of the arrangement of Cr spins in a honeycomb lattice, magnons in CrI3 bear a strong resemblance with electrons in graphene. Neutron scattering experiments carried out in bulk CrI3 show the existence of a gap at the Dirac points, conjectured to have a topological nature. We propose a theory for magnons in CrI3 monolayers based on an itinerant fermion picture, with a Hamiltonian derived from first principles. We obtain the magnon dispersion for 2D CrI3 with a gap at the Dirac points with the same Berry curvature in both valleys. For CrI3 ribbons, we find chiral in-gap edge states. Analysis of the magnon wave functions in momentum space confirms their topological nature. Importantly, our approach does not require a spin Hamiltonian, and can be applied to insulating and conducting 2D materials with any type of magnetic order.application/pdfengTopological magnons in CrI3 monolayers: an itinerant fermion descriptionCosta, A. T.Santos, D. L. R.Peres, N. M. R.Fernández-Rossier, J.HostingInstitutionOrganizationalUniversidade do Minhoe-mailmailto:repositorium@usdb.uminho.ptrepositorium@usdb.uminho.ptISSNIsPartOf2053-1583DOIIsPartOf10.1088/2053-1583/aba88f2020-12-11T16:40:25Z2020-092020-052020-12-11T14:44:59Z2020-09-01T00:00:00ZHandlehttps://hdl.handle.net/1822/68513http://purl.org/coar/access_right/c_abf2open access2D magnetsFermionic HamiltonianMagnonsTopological matterTrihalidesVan der Waals magnets572285 bytesliteraturehttp://purl.org/coar/resource_type/c_6501journal articlehttp://purl.org/coar/access_right/c_abf2application/pdffulltexthttps://prod-dspace.uminho.pt/bitstreams/ebf20f59-f703-4a9a-bc6e-248016ba6bd1/download |
| spellingShingle | Topological magnons in CrI3 monolayers: an itinerant fermion description Costa, A. T. 2D magnets Fermionic Hamiltonian Magnons Topological matter Trihalides Van der Waals magnets |
| status | SINGLETON |
| subject.fl_str_mv | 2D magnets Fermionic Hamiltonian Magnons Topological matter Trihalides Van der Waals magnets |
| title | Topological magnons in CrI3 monolayers: an itinerant fermion description |
| title_full | Topological magnons in CrI3 monolayers: an itinerant fermion description |
| title_fullStr | Topological magnons in CrI3 monolayers: an itinerant fermion description |
| title_full_unstemmed | Topological magnons in CrI3 monolayers: an itinerant fermion description |
| title_short | Topological magnons in CrI3 monolayers: an itinerant fermion description |
| title_sort | Topological magnons in CrI3 monolayers: an itinerant fermion description |
| topic | 2D magnets Fermionic Hamiltonian Magnons Topological matter Trihalides Van der Waals magnets |
| topic_facet | 2D magnets Fermionic Hamiltonian Magnons Topological matter Trihalides Van der Waals magnets |
| url | https://hdl.handle.net/1822/68513 |
| visible | 1 |