Ising phases of heisenberg ladders in a magnetic field

Karlo Penc, Jean Baptiste Fouet, Shin Miyahara, Oleg Tchernyshyov, Frédéric Mila

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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.

Original languageEnglish
Article number117201
JournalPhysical review letters
Issue number11
Publication statusPublished - Sep 10 2007

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Penc, K., Fouet, J. B., Miyahara, S., Tchernyshyov, O., & Mila, F. (2007). Ising phases of heisenberg ladders in a magnetic field. Physical review letters, 99(11), [117201].