lnu.sePublikasjoner
Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Quantum Transport by Spin‐Polarized Edge States in Graphene Nanoribbons in the Quantum Spin Hall and Quantum Anomalous Hall Regimes
Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).
Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).ORCID-id: 0000-0001-5551-8980
Nordita, Stockholm.ORCID-id: 0000-0002-7831-7214
Linnéuniversitetet, Fakulteten för teknik (FTK), Institutionen för fysik och elektroteknik (IFE).ORCID-id: 0000-0003-4489-7561
2018 (engelsk)Inngår i: Physica Status Solidi. Rapid Research Letters, ISSN 1862-6254, E-ISSN 1862-6270, Vol. 12, nr 11, Special Issue, artikkel-id 1800210Artikkel i tidsskrift, Letter (Fagfellevurdert) Published
Abstract [en]

Using the non-equilibrium Green’s function method and the Keldysh formalism, we study the effects of spin–orbit interactions and time-reversal symmetry breaking exchange fields on non-equilibrium quantum transport in graphene armchair nanoribbons. We identify signatures of the quantum spin Hall (QSH) and the quantum anomalous Hall (QAH) phases in nonequilibrium edge transport by calculating the spin-resolved real space charge density and local currents at the nanoribbon edges. We find that the QSH phase, which is realized in a system with intrinsic spin–orbit coupling, is characterized by chiral counter-propagating local spin currents summing up to a net charge flow with opposite spin polarization at the edges. In the QAH phase, emerging in the presence of Rashba spin–orbit coupling and a ferromagnetic exchange field, two chiral edge channels with opposite spins propagate in the same direction at each edge, generating an unpolarized charge current and a quantized Hall conductance  . Increasing the intrinsic spin–orbit coupling causes a transition from the QAH to the QSH phase, evinced by characteristic changes in the non-equilibrium edge transport. In contrast, an antiferromagnetic exchange field can coexist with a QSH phase, but can never induce a QAH phase due to a symmetry that combines time-reversal and sublattice translational symmetry.

sted, utgiver, år, opplag, sider
Wiley-Blackwell, 2018. Vol. 12, nr 11, Special Issue, artikkel-id 1800210
Emneord [en]
graphene nanoribbons, quantum anomalous Hall effect, quantum spin Hall effect, topological insulators
HSV kategori
Forskningsprogram
Fysik, Kondenserade materians fysik
Identifikatorer
URN: urn:nbn:se:lnu:diva-76947DOI: 10.1002/pssr.201800210ISI: 000450130300007Scopus ID: 2-s2.0-85050622980OAI: oai:DiVA.org:lnu-76947DiVA, id: diva2:1233764
Forskningsfinansiär
Carl Tryggers foundation , CTS 14:178Swedish Research Council, 621‐2014‐4785Tilgjengelig fra: 2018-07-19 Laget: 2018-07-19 Sist oppdatert: 2019-08-29bibliografisk kontrollert

Open Access i DiVA

fulltext(641 kB)0 nedlastinger
Filinformasjon
Fil FULLTEXT01.pdfFilstørrelse 641 kBChecksum SHA-512
8db731ca0d2d4e02f6fa06c7558f2664d02c64b05508cc688c0228276e92cab9a0e6b639ed2f211c10c5241123e78d4613712e855b37156cc2f09ef88f922261
Type fulltextMimetype application/pdf

Andre lenker

Forlagets fulltekstScopus

Personposter BETA

Pournaghavi, NezhatHolmqvist, CeciliaPertsova, AnnaCanali, Carlo M.

Søk i DiVA

Av forfatter/redaktør
Pournaghavi, NezhatHolmqvist, CeciliaPertsova, AnnaCanali, Carlo M.
Av organisasjonen
I samme tidsskrift
Physica Status Solidi. Rapid Research Letters

Søk utenfor DiVA

GoogleGoogle Scholar
Antall nedlastinger er summen av alle nedlastinger av alle fulltekster. Det kan for eksempel være tidligere versjoner som er ikke lenger tilgjengelige

doi
urn-nbn

Altmetric

doi
urn-nbn
Totalt: 199 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf