Spectrum of a magnetized strong-leg quantum spin ladder.
Spectrum of a magnetized strong-leg quantum spin ladder.
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磁化强腿量子自旋梯的光谱。
DOI：
10.1103/physrevlett.111.107202
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发表时间：
2013
影响因子：
8.6
通讯作者：
A. Zheludev
中科院分区：
文献类型：
--
作者：
D. Schmidiger;P. Bouillot;Tatiana Guidi;R. Bewley;C. Kollath;T. Giamarchi;A. Zheludev
非弹性中子散射被用来测量自旋激发谱的海森堡S=1/2梯形材料（C7 H10 N）2CuBr 4在其整体，无论是在带隙的自旋液体和磁场诱导Tomonaga-Luttinger自旋液体制度。在这两个区域之间观察到自旋动力学的根本变化。密度矩阵重整化群计算定量再现和帮助理解所观察到的公度和非公度激发。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。
Inelastic neutron scattering is used to measure the spin excitation spectrum of the Heisenberg S=1/2 ladder material (C7H10N)2CuBr4 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. Density matrix renormalization group 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.