Intrinsic coupling of orbital excitations to spin fluctuations in Mott insulators.
Intrinsic coupling of orbital excitations to spin fluctuations in Mott insulators.
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DOI：
10.1103/physrevlett.107.147201
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发表时间：
2011-09
影响因子：
8.6
通讯作者：
K. Wohlfeld;M. Daghofer;S. Nishimoto;G. Khaliullin;J. van den Brink
中科院分区：
文献类型：
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作者：
K. Wohlfeld;M. Daghofer;S. Nishimoto;G. Khaliullin;J. van den Brink
我们展示了如何在强相关的氧化物，自旋和轨道的两个基本的自由度之间的一般和基本的不对称性，有非常深刻的影响的基本自旋和轨道激发。虽然磁振子在很大程度上不受影响，但在具有反铁磁和铁轨道有序基态的自旋轨道模型中，轨道与自旋涨落固有地耦合。出现的复合轨道-磁振子模式在一维中再次分裂，在自旋子比轨道快的特殊区域中产生自旋-轨道分离。
We show how the general and basic asymmetry between two fundamental degrees of freedom present in strongly correlated oxides, spin and orbital, has very profound repercussions on the elementary spin and orbital excitations. Whereas the magnons remain largely unaffected, orbitons become inherently coupled with spin fluctuations in spin-orbital models with antiferromagnetic and ferro-orbital ordered ground states. The composite orbiton-magnon modes that emerge fractionalize again in one dimension, giving rise to spin-orbital separation in the peculiar regime where spinons are faster than orbitons.