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

Charge ordering (CO) with long-periodicities in a geometrically frustratedsystem, theta-(BEDT-TTF)2X, is numerically studied. We consider interactingfermion models on the anisotropic triangular lattice: the extended Hubbardmodel and the spinless fermion model, taking account of the inter-site Coulombinteractions on not only the nearest neighbor (NN) but also the next nearestneighbor (NNN) bonds. By applying Lanczos exact diagonalization method, we findthat long-period charge correlations become dominant when NNN terms areincluded, in the charge-frustrated region. The calculated optical excitationspectra show that the charge transfer excitations in the long-period CO extendto a lower energy range compared to those in the short-period CO statesincluding the 3-fold CO stabilized when NNN terms are absent. Our resultssuggest that the charge correlations experimentally observed in the titlecompounds near the CO insulating phase can be viewed as a tendency toward`tilted stripe'-type CO with large charge fluctuations.

Long-Period Charge Correlations in Charge-Frustrated Molecular theta-(BEDT-TTF)2X