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

By exploiting the particle-hole symmetries of the Hubbard model, the periodicAnderson model and the Kondo lattice model at half-filling and applying ageneralized version of Lieb's spin-reflection positivity method, we show thatthe charged gaps of these models are always larger than their spin excitationgaps. This theorem confirms the previous results derived by either thevariational approach or the density renormalization group approach.Comment: 20 pages, no figur

Charged and spin-excitation gaps in half-filled strongly correlated electron systems: A rigorous result