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 consider the spin-1/2 isotropic $XY$ chain in an external magnetic fielddirected along $z$ axis with periodically varying $g$-factors. To reveal theeffects of regularly alternating $g$-factors, we calculate various static anddynamic equilibrium quantities in the ground state and at finite temperatures.We demonstrate that because of the regularly alternating $g$-factors thesaturation field may disappear and the field dependence of the susceptibilityin the ground state has additional logarithmic singularity at zero field.Moreover, the zero-field susceptibility has a logarithmic singularity as $T\to0$. Furthermore, the dynamic structure factors exhibit much more structure inthe "wave vector -- frequency" plane that can be traced out to modifications ofthe two-fermion excitation continua which exclusively determine$S_{zz}(\kappa,\omega)$ and dominate the properties of $S_{xx}(\kappa,\omega)$.We discuss what changes can be observed in dynamic experiments on thecorresponding substances.

Spin-1/2 $XX$ chain in a transverse field with regularly alternating $g$-factors: Static and dynamic properties