Phase diagrams of spin ladders with ferromagnetic legs
T. Vekua, G.I. Japaridze, and H.-J. Mikeska
TL;DR
This paper investigates the phase diagrams of spin-1/2 ladders with ferromagnetic legs using bosonization, revealing multiple gapless spin-liquid phases and analyzing behavior near ferromagnetic instability.
Contribution
It provides the first detailed weak-coupling phase diagram for anisotropic ferromagnetic-leg spin ladders using bosonization.
Findings
Existence of several gapless spin-liquid phases.
Detailed analysis of behavior near ferromagnetic instability.
Phase diagram covering a wide range of coupling constants.
Abstract
The low-temperature properties of the spin S=1/2 ladder with anisotropic ferromagnetic legs are studied using the continuum limit bosonization approach. The weak-coupling ground state phase diagram of the model is obtained for a wide range of coupling constants and several unconventional gapless ''spin-liquid'' phases are shown to exist for ferromagnetic coupling. The behavior of the ladder system in the vicinity of the ferromagnetic instability point is discussed in detail.
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