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

The singularity of quantum correlation has been widely regarded as a valuable indicator for quantum phase transition (QPT) in low‐dimensional quantum systems. In this paper, in a two‐leg spin ladder with ring exchange, the critical points of the system cannot be detected by analyzing the singularity of the quantum discord (a kind of quantum correlation). Instead, the discord exhibits a novel odd–even effect in the symmetry‐breaking (SB) regions, which can be used to detect the two critical points between the SB regions and the non‐SB regions. The underlying mechanism of the odd–even effect is explained.

Odd–even effect of quantum discord in the spin‐1/2 Heisenberg two‐leg ladder with ring exchange