English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

A Kubo formalism is used to calculate the electronic and optical conductivityof a graphene superlattice with Y-shaped kekul\'e bond texture, similar to thatvisualized in recent experiments. We show that new conduction channels betweenthe valleys in graphene are opened by the kekul\'e distortion. This intervalleycontribution to the electronic transport is not present in pristine grapheneand here appears due to the folding of the Dirac cones $K$, $K'$ on top of eachother. The contribution of intervalley transport to the conductivity ofgraphene, as well as the modification of the intravalley transport, areanalyzed in detail for different frequency, temperature, chemical potential andscattering rate limits. We obtain analytical expressions for the conductivitythat reproduce previous expressions used to fit experimental measurements ingraphene and compare with direct numerical evaluations of the Kubo formula,finding great agreement. The optical absorption arising from intervalleytransitions displays a maximum at a special frequency that can be tuned bydoping. Our results show how the single parameter describing the valleycoupling in this system could be obtained by measuring graphene's opticalabsorbance in the region where interband transitions are blocked by theimpurities. Finally, we use Fermi's golden rule to independently verify some ofthe previous results.

Electronic and optical conductivity of kekul\'e-patterned graphene: Intravalley and intervalley transport