Phases of the generalized two-leg spin ladder: A view from the SU(4) symmetry

Details Phases of the generalized two-leg spin ladder: A view from the SU(4) symmetry Phases of the generalized two-leg spin ladder: A view from the SU(4) symmetry

2004-05-13

arxiv.org/abs/cond-mat/0405275v1

Phys.Rev.B71 020407(R) (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 1 figure

Scientific paper

10.1103/PhysRevB.71.020407

The zero-temperature phases of a generalized two-leg spin ladder with four-spin exchanges are discussed by means of a low-energy field theory approach starting from an SU(4) quantum critical point. The latter fixed point is shown to be a rich multicritical point which unifies different competing dimerized orders and a scalar chirality phase which breaks spontaneously the time-reversal symmetry. The quantum phase transition between these phases is governed by spin-singlet fluctuations and belongs to the Luttinger universality class due to the existence of an exact U(1) self-duality symmetry.

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