Ising Phases of Heisenberg Ladders in a Magnetic Field

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.


Published in:
Physical Review Letters, 99, 11, 117201
Year:
2007
Laboratories:
CTMC


Note: The status of this file is: Anyone


 Record created 2019-06-24, last modified 2020-10-25

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