dc.contributor.author
Trifunovic, Luka
dc.contributor.author
Brouwer, Piet W.
dc.date.accessioned
2019-11-06T09:14:42Z
dc.date.available
2019-11-06T09:14:42Z
dc.identifier.uri
https://refubium.fu-berlin.de/handle/fub188/25882
dc.identifier.uri
http://dx.doi.org/10.17169/refubium-25643
dc.description.abstract
In the presence of crossed electric and magnetic fields, a graphene ribbon has chiral states running along sample edges and along boundaries between p-doped and n-doped regions. We here consider the scattering of edge states into interface states, which takes place wherever the pn interface crosses the sample boundary, as well as the reverse process. For a graphene ribbon with armchair boundaries, the evolution of edge states into interface states and vice versa is governed by the conservation of valley isospin. Although valley isospin is not conserved in simplified models of a ribbon with zigzag boundaries, we find that arguments based on isospin conservation can be applied to a more realistic modeling of the graphene ribbon, which takes account of the lifting of electron-hole degeneracy. The valley isospin of interface states is an important factor determining the conductance of a graphene pn junction in a quantizing magnetic field.
en
dc.format.extent
14 Seiten
dc.rights.uri
http://www.fu-berlin.de/sites/refubium/rechtliches/Nutzungsbedingungen
dc.subject
quantum Hall effect
en
dc.subject
valleytronics
en
dc.subject
condensed matter
en
dc.subject
materials physics
en
dc.subject.ddc
500 Naturwissenschaften und Mathematik::530 Physik::539 Moderne Physik
dc.title
Valley isospin of interface states in a graphene pn junction in the quantum Hall regime
dc.type
Wissenschaftlicher Artikel
dcterms.bibliographicCitation.articlenumber
205431
dcterms.bibliographicCitation.doi
10.1103/PhysRevB.99.205431
dcterms.bibliographicCitation.journaltitle
Physical review
dcterms.bibliographicCitation.number
20
dcterms.bibliographicCitation.volume
99
dcterms.bibliographicCitation.url
https://doi.org/10.1103/PhysRevB.99.205431
refubium.affiliation
Physik
refubium.affiliation.other
Institut für Theoretische Physik
refubium.resourceType.isindependentpub
no
dcterms.accessRights.openaire
open access
dcterms.isPartOf.issn
2469-9950
dcterms.isPartOf.eissn
2469-9969