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arXiv 1306.4216cond-mat.str-el
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磁化强腿量子自旋梯的谱

Spectrum of a magnetized strong-leg quantum spin ladder

D. Schmidiger, P. Bouillot, T. Guidi, R. Bewley, C. Kollath, T. Giamarchi, A. Zheludev

摘要:

非弹性中子散射被用来测量海森堡$S=1/2$梯形材料(C $_7$ H $_10$ N)$_2$ CuBr $_4$的自旋激发谱,在带隙自旋液体和磁场诱导的Tomonaga-Luttinger自旋液体区域。在这两个区域之间观察到自旋动力学的根本变化。DMRG计算定量再现和帮助理解所观察到的相称和不相称的激发。结果验证了长期存在的量子场论预测,但也测试了这种方法的局限性。

英文摘要:

Inelastic neutron scattering is used to measure the spin excitation spectrum of the Heisenberg $S=1/2$ ladder material (C$_7$H$_10$N)$_2$CuBr$_4$ in its entirety, both in the gapped spin-liquid and the magnetic field induced Tomonaga-Luttinger spin liquid regimes. A fundamental change of the spin dynamics is observed between these two regimes. DMRG calculations quantitatively reproduce and help understand the observed commensurate and incommensurate excitations. The results validate long-standing quantum field theoretical predictions, but also test the limits of that approach.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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