Anisotropy-induced soliton excitation in magnetized strong-rung spin ladders

Abstract

We report low temperature electron spin resonance experimental and theoretical studies of an archetype $S=1/2$ strong-rung spin ladder material (C${}_5$H${}_{12}$N)${}_2$CuBr${}_4$. Unexpected dynamics is detected deep in the Tomonaga-Luttinger spin liquid regime. Close to the point where the system is half-magnetized (and believed to be equivalent to a gapless easy plane chain in zero field) we observed orientation-dependent spin gap and anomalous $g$-factor values. Field theoretical analysis demonstrates that the observed low-energy excitation modes in magnetized (C${}_5$H${}_{12}$N)${}_2$CuBr${}_4$ are solitonic excitations caused by Dzyaloshinskii-Moriya interaction presence.

arXiv comment6 pages main text and 4 figures with supplemental materials 8 pages and 2 figures

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Cited by in corpus (2)

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