Condensation of magnons and spinons in a frustrated ladder

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Title: Condensation of magnons and spinons in a frustrated ladder
Author: Fouet, J.-B.; Mila, F.; Clarke, D.; Youk, H.; Tchernyshyov, O.; Fendley, P.; Noack, R.M.
Abstract: Motivated by the ever-increasing experimental effort devoted to the properties of frustrated quantum magnets in a magnetic field, we present a careful and detailed theoretical analysis of a one-dimensional version of this problem, a frustrated ladder with a magnetization plateau at m=1/2. We show that even for purely isotropic Heisenberg interactions, the magnetization curve exhibits a rather complex behavior that can be fully accounted for in terms of simple elementary excitations. The introduction of anisotropic interactions (e.g., Dzyaloshinskii-Moriya interactions) modifies significantly the picture and reveals an essential difference between integer and fractional plateaus. In particular, anisotropic interactions generically open a gap in the region between the plateaus, but we show that this gap closes upon entering fractional plateaus. All of these conclusions, based on analytical arguments, are supported by extensive density matrix renormalization group calculations.
Date: 2006-06-01
Citation: Physical Review B (Condensed Matter and Materials Physics) 1 June 2006, vol.73, no.21, pp. 214405-1-13
Subject: frustrated ladder
frustrated quantum magnets
magnetization plateau
isotropic Heisenberg interaction
elementary excitations
anisotropic interaction
density matrix renormalization group calculation
Dzyaloshinskii-Moriya interaction

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