Exotic Quantum Phase Transition of the Spin Nanotube

27th International Conference on Low Temperature Physics

Sakai, Toru^1 ; Nakano, Hiroki^1 ; Okunishi, Kouichi^1

Japan Atomic Energy Agency, SPring-8, Hyogo 679-5148, Japan, Graduate School of Material Science, University of Hyogo, Hyogo 678-1297, Japan Department of Physics, Niigata University, Niigata 950-2181, Japan^1

关键词: Critical value;    Diagonalizations;    Finite-size scaling analysis;    Quantum phase transitions;    Spin gap;    Spin nanotubes;    Spin tubes;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/4/042024/pdf
DOI  :  10.1088/1742-6596/568/4/042024

来源: IOP

【 摘 要 】

The S=1/2 three-leg spin tube is investigated using the numerical diagonalization up to the 42-spin clusters. A precise finite-size scaling analysis, so called the level spectroscopy, is carried out. It indicates a quantum phase transition between the spin-gap and gapless phases, with respect to the ratio of the leg and rung exchange interactions. The present analysis gives a precise estimate for the critical value of the ratio.