lnu.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Quantum Transport by Spin‐Polarized Edge States in Graphene Nanoribbons in the Quantum Spin Hall and Quantum Anomalous Hall Regimes
Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.ORCID iD: 0000-0001-5551-8980
Nordita, Stockholm.ORCID iD: 0000-0002-7831-7214
Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.ORCID iD: 0000-0003-4489-7561
2018 (English)In: Physica Status Solidi. Rapid Research Letters, ISSN 1862-6254, E-ISSN 1862-6270, Vol. 12, no 11, Special Issue, article id 1800210Article in journal, Letter (Refereed) 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.

Place, publisher, year, edition, pages
Wiley-Blackwell, 2018. Vol. 12, no 11, Special Issue, article id 1800210
Keywords [en]
graphene nanoribbons, quantum anomalous Hall effect, quantum spin Hall effect, topological insulators
National Category
Condensed Matter Physics
Research subject
Physics, Condensed Matter Physics
Identifiers
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
Funder
Carl Tryggers foundation , CTS 14:178Swedish Research Council, 621‐2014‐4785Available from: 2018-07-19 Created: 2018-07-19 Last updated: 2019-08-29Bibliographically approved

Open Access in DiVA

fulltext(641 kB)1 downloads
File information
File name FULLTEXT01.pdfFile size 641 kBChecksum SHA-512
8db731ca0d2d4e02f6fa06c7558f2664d02c64b05508cc688c0228276e92cab9a0e6b639ed2f211c10c5241123e78d4613712e855b37156cc2f09ef88f922261
Type fulltextMimetype application/pdf

Other links

Publisher's full textScopus

Authority records BETA

Pournaghavi, NezhatHolmqvist, CeciliaPertsova, AnnaCanali, Carlo M.

Search in DiVA

By author/editor
Pournaghavi, NezhatHolmqvist, CeciliaPertsova, AnnaCanali, Carlo M.
By organisation
Department of Physics and Electrical Engineering
In the same journal
Physica Status Solidi. Rapid Research Letters
Condensed Matter Physics

Search outside of DiVA

GoogleGoogle Scholar
Total: 1 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 208 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf