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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We suggest a general rule for the shift quantum numbers k of the relativeground states of antiferromagnetic Heisenberg spin rings. This rule generalizeswell-known results of Marshall, Peierls, Lieb, Schultz, and Mattis for evenrings. Our rule is confirmed by numerical investigations and rigorous proofsfor special cases, including systems with a Haldane gap. Implications for thetotal spin quantum number S of relative ground states are discussed as well asgeneralizations to the XXZ model.

Quantum numbers for relative ground states of antiferromagnetic Heisenberg spin rings