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arXiv 0909.3355cond-mat.str-el
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受抑量子自旋液体手征磁化态的激发

Excitations from a chiral magnetized state of a frustrated quantum spin liquid

A. Zheludev, V. O. Garlea, A. Tsvelik, L. -P. Regnault, K. Habicht, K. Kiefer, B. Roessli

摘要:

研究了通过几何阻挫键耦合的弱相互作用量子自旋梯对中的激发。基态是一种无序的自旋液体,在高场下被有序的手性螺旋磁相取代。原型化合物Sul-Cu 2Cl 4的高场非弹性中子散射实验所观察到的光谱与先前研究的无阻挫自旋液体中的光谱有质的不同。在临界场Hc=3.7 T之外,驱动量子相变的软模产生两个独立的激发:无隙戈德斯通模和大质量磁振子。在Hc以下可以清楚地看到另外一些有质量的准粒子,但它们在有序相中被破坏了。在它们的位置上,人们观察到一个严格束缚的激发连续体。

英文摘要:

We study excitations in weakly interacting pairs of quantum spin ladders coupled through geometrically frustrated bonds. The ground state is a disordered spin liquid, that at high fields is replaced by an ordered chiral helimagnetic phase. The spectra observed by high-field inelastic neutron scattering experiments on the prototype compound Sul-Cu2Cl4 are qualitatively different from those in the previously studied frustration-free spin liquids. Beyond the critical field Hc=3.7 T, the soft mode that drives the quantum phase transition spawns two separate excitations: a gapless Goldstone mode and a massive magnon. Additional massive quasiparticles are clearly visible below Hc, but are destroyed in the ordered phase. In their place one observes a sharply bound excitation continuum.

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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