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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We investigate the formation of density waves in the zero-gap state (ZGS)which has been found in the quasi-two-dimensional organic conductor$\alpha$-(BEDT-TTF)$_2$I$_3$ salt under the hydrostatic pressure. The ZGSexhibits the cone-like dispersion for both the conduction band and the valenceband which degenerate each other at the two-dimensional wave vectors,$\pm\mib{k}_0$ forming a zero gap. By using the extended Hubbard model withrepulsive interaction we calculate the onset temperature of the spin densitywave (SDW) as a function of the interlayer electron hopping, which by itselfdoes not break the cone-like dispersion. It is shown that the SDW with wavenumber $2\mib{k}_0$ is induced by the combined effect of the interaction, theinter-band excitation across the zero-gap and the interlayer hopping.

Role of Interlayer Electron Hopping for Spin Density Wave State in the Zero-Gap Organic Conductor