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

Abstract

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.

5 pages, 1 figure

References in corpus (2)

• "Deconfined" quantum critical points
• Phase Diagram of a Spin Ladder with Cyclic Four Spin Exchange

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