Condensation of magnons and spinons in a frustrated ladder

Show full item record

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.
URI: http://jhir.library.jhu.edu/handle/1774.2/33758
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
spinons
frustrated quantum magnets
magnetization plateau
magnons
isotropic Heisenberg interaction
elementary excitations
anisotropic interaction
density matrix renormalization group calculation
Dzyaloshinskii-Moriya interaction

Files in this item

Files Size Format Download
Oleg Condensation 2006.pdf 997.6Kb application/pdf Download

The following license files are associated with this item:

This item appears in the following Collection(s)

Show full item record