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

We investigate the low-energy properties of N-leg integer-spin ladders andtubes with an antiferromagnetic (AF) intrachain coupling. In the odd-leg tubes,the AF rung coupling causes the frustration. To treat all ladders and tubessystematically, we apply S\'en\'echal's method [Phys. Rev. B 52, 15319 (1995)],based on the nonlinear sigma model. This strategy is valid in the weakinterchain (rung) coupling regime. We show that all frustrated tubes possesssix-fold degenerate spin-1 magnon bands, as the lowest excitations, while otherladders and tubes have a standard triply degenerate bands. We also considereffects of four kinds of Zeeman terms: uniform, staggered only along the rung,only along the chain, or both directions. The above prediction of the no-fieldcase implies that a sufficiently strong uniform field yields a two-componentTomonaga-Luttinger liquid (TLL) due to the condensation of doubly degeneratelowest magnons in frustrated tubes. In contrast, the field induces a standardone-component TLL in all other systems. This is supported by symmetry andbosonization arguments based on the Ginzburg-Landau theory. The bosonizationalso suggests that the two-component TLL vanishes and a one-component TLLappears, when the uniform field becomes larger for the second lowest magnonbands to touch the zero-energy line. This transition could be observed as acusp singularity in the magnetization process. All the analyses for the systemswith a staggered Zeeman term suggest that the emergence of the doublydegenerate transverse magnons and the single longitudinal one is universal forthe one-dimensional AF spin systems with weak staggered field.Comment: 26 pages, 18 figures, Revtex. published version. see also short  articles, cond-mat/0410419 and cond-mat/051102

physical review. b, condensed matter and materials physics

<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi></mml:math>-leg integer-spin ladders and tubes in commensurate external fields: Nonlinear sigma model approach

N-leg integer-spin ladders and tubes in commensurate external fields: Nonlinear sigma model approach