Ising phases of Heisenberg ladders in a magnetic field

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Title: Ising phases of Heisenberg ladders in a magnetic field
Author: Penc, K.; Fouet, J.-B.; Miyahara, S.; Tchernyshyov, O.; Mila, F.
Abstract: We show that Dzyaloshinskii-Moriya (DM) interactions can substantially modify the phase diagram of spin-1/2 Heisenberg ladders in a magnetic field provided they compete with exchange. For nonfrustrated ladders, they induce a local magnetization along the DM vector that turns the gapless intermediate phase into an Ising phase with broken translational symmetry, while for frustrated ladders, they extend the Ising order of the half-integer plateau to the surrounding gapless phases of the purely Heisenberg case. Implications for experimental ladder and dimer systems are discussed.
Date: 2007-09-14
Citation: Physical Review Letters 14 Sept. 2007, vol.99, no.11, pp. 117201-1-4
Subject: Dzyaloshinskii-Moriya interactions
Ising model
Heisenberg model
magnetic field
spin-1/2 Heisenberg ladders
gapless intermediate phase
broken translational symmetry

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