YbAlO $_3$中Tomonaga-Luttinger液体行为和自旋限制
Tomonaga-Luttinger Liquid Behavior and Spinon Confinement in YbAlO$_3$
摘要：
低维量子磁体是一个有趣的研究领域，因为在强量子涨落的作用下，低维量子磁体会出现集体行为。一维（1D）S = 1/2海森堡反铁磁体是一个典型的例子，其低能量激发，称为自旋子，携带分数自旋S = 1/2。这些分数模可以通过施加交错磁场来重新限制。尽管对这种磁体的理论理解已经取得了相当大的进展，但这种低维物理的实验实现相对较少。这对于稀土基磁体尤其如此，因为强自旋轨道耦合和晶体场分裂的组合引起的大的有效自旋各向异性。在这里，我们证明了稀土钙钛矿YbAlO $_3$提供了一个实现的量子自旋S = 1/2链材料，表现出量子临界Tomonaga-Luttinger液体行为和自旋约束-解除限制在不同区域的磁场-温度相图。
英文摘要：
Low dimensional quantum magnets are interesting because of the emerging collective behavior arising from strong quantum fluctuations. The one-dimensional (1D) S = 1/2 Heisenberg antiferromagnet is a paradigmatic example, whose low-energy excitations, known as spinons, carry fractional spin S = 1/2. These fractional modes can be reconfined by the application of a staggered magnetic field. Even though considerable progress has been made in the theoretical understanding of such magnets, experimental realizations of this low-dimensional physics are relatively rare. This is particularly true for rare-earth based magnets because of the large effective spin anisotropy induced by the combination of strong spin-orbit coupling and crystal field splitting. Here, we demonstrate that the rare-earth perovskite YbAlO$_3$ provides a realization of a quantum spin S = 1/2 chain material exhibiting both quantum critical Tomonaga-Luttinger liquid behavior and spinon confinement-deconfinement transitions in different regions of magnetic field-temperature phase diagram.
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