QUANTUM PHASE TRANSITION OF A TRIANGULAR LATTICE SPIN TUBE AND EDGE SPIN EFFECTS

Kouichi Okunishi (), Shin-Ichiro Yoshikawa, Tôru Sakai and Seiji Miyashita
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Kouichi Okunishi: Department of Physics, Niigata University, Igarashi2 Niigata 950-2181, Japan
Shin-Ichiro Yoshikawa: Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
Tôru Sakai: Japan Atomic Energy Agency (JAEA), Spring-8, Hyogo 679-8551, Japan
Seiji Miyashita: Department of Physics, University of Tokyo, 7-3-1 Honogo, Bunkyo-ku Tokyo 113-0033, Japan;

International Journal of Modern Physics C (IJMPC), 2009, vol. 20, issue 09, 1423-1430

Abstract: We study the low-energy excitation of the quantum spin tube with the triangular lattice structure, using density matrix renormalization group. Taking account of the edge spin effect, we particularly investigate the spin gap behavior and the low-field magnetization curve near the quantum phase transition point in contrast with the usual free boundary condition. We then find that the bulk behavior of the spin tube can be extracted easier for the single spin termination.

Keywords: Spin tube; spin gap; edge effect; DMRG; 11.25.Hf; 123.1K (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1142/S0129183109014485

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