Quantum spin nanotubes -- frustration, competing orders and criticalities

Details Quantum spin nanotubes -- frustration, competing orders and criticalities Quantum spin nanotubes -- frustration, competing orders and criticalities

2010-07-29

arxiv.org/abs/1007.5102v2

J. Phys.: Condens. Matt. 22 (2010) 403201

Physics

Condensed Matter

Statistical Mechanics

Published in JPCM as a topical review, 24 pages, 11 figures

Scientific paper

10.1088/0953-8984/22/40/403201

Recent developments of theoretical studies on spin nanotubes are reviewed, especially focusing on the $S=1/2$ three-leg spin tube. In contrast to the three-leg spin ladder, the tube has a spin gap in case of the regular-triangle unit cellwhen the rung interaction is sufficiently large. The effective theory based on the Hubbard Hamiltonian indicates a quantum phase transition to the gapless spin liquid due to the lattice distortion to an isosceles triangle. This is also supported by the numerical diagonalization and the density matrix renormalization group analyses. Furthermore, combining analytical and numerical approaches, we reveal several novel magnetic-field-induced phenomena: N\'eel, dimer, chiral and/or inhomogeneous orders, new mechanism for the magnetization plateau formation,and others. The recently synthesized spin tube materials are also briefly introduced.

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