Spin-chirality duality in a spin ladder with four-spin cyclic exchange

Abstract

Effect of four-spin cyclic exchange on magnetism is studied in the two-leg S=1/2 ladder. We develop an exact spin-chirality duality transformation, under which the system is self-dual when the four-spin exchange J_4 is half of the two-spin exchange. Using the density-matrix renormalization-group method and the duality relation, we find that the four-spin exchange makes the vector chirality correlation dominant. A "chirality short-range resonating-valence-bond" phase is identified for the first time at large J_4.

5 pages, 3 figures, revtex4; revised version, numerical data for larger systems added, conclusion for the intermediate phase modified, to appear in Phys. Rev. Lett

References in corpus (5)

• Cyclic Spin Exchange in Cuprate Spin Ladders
• Perturbation theories for the S=1/2 spin ladder with four-spin ring exchange
• Raman Response in Antiferromagnetic Two-Leg S=1/2 Heisenberg Ladders
• Universality class of S=1/2 quantum spin ladder system with the four spin exchange
• Field-Induced gap due to four-spin exchange in a spin ladder

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• Magnetic Phase Diagram of Spin-1/2 Two-Leg Ladder with Four-Spin Ring Exchange
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