Phase diagram of the Kondo-Heisenberg model on honeycomb lattice with geometrical frustration
Phase diagram of the Kondo-Heisenberg model on honeycomb lattice with geometrical frustration
复制标题
具有几何挫败性的蜂窝晶格上近藤-海森堡模型的相图
DOI：
10.1209/0295-5075/116/37005
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发表时间：
2016-07
期刊：
影响因子：
1.8
通讯作者：
刘瑜
中科院分区：
文献类型：
--
作者：
黎欢;宋海峰;刘瑜
我们计算了具有近邻和次近邻反铁磁自旋交换的二维蜂窝晶格上Kondo-Heisenberg模型的相图，研究了存在磁挫败时RKKY和Kondo相互作用之间的相互作用。在从费米子表示下的平均场去耦合技术下，我们得到了零温相图，它是近藤耦合JK和受挫强度Q的函数。几何受挫可以破坏磁序，将原来的反铁磁(AF)相驱动为非磁性价键固体(VBS)。此外，我们还发现了两个截然不同的VB。随着JK的增加，发生了从AF到Kondo顺磁(KP)相的相变，在正方晶格系统中没有发现与Kondo屏蔽共存的中间相AF有序。在KP阶段，挫折感的增强削弱了Kondo筛选效应，导致了从KP到VBS的相变。我们还发现了一个通过在广泛的挫折强度范围内增加JK来恢复VBS的AF订单的过程。我们的工作可能为未来对受挫重费米子化合物中量子相变新过程的实验观测提供预测。
We calculated the phase diagram of the Kondo-Heisenberg model on a two-dimensional honeycomb lattice with both nearest-neighbor and next-nearest-neighbor antiferromagnetic spin exchanges, to investigate the interplay between RKKY and Kondo interactions in the presence of magnetic frustration. Within a mean-field decoupling technology in slave-fermion representation, we derived the zero-temperature phase diagram as a function of Kondo coupling Jk and frustration strength Q. The geometrical frustration can destroy the magnetic order, driving the original antiferromagnetic (AF) phase to non-magnetic valence bond solids (VBS). In addition, we found two distinct VBS. As Jk is increased, a phase transition from AF to Kondo paramagnetic (KP) phase occurs, without the intermediate phase coexisting AF order with Kondo screening found in square lattice systems. In the KP phase, the enhancement of frustration weakens the Kondo screening effect, resulting in a phase transition from KP to VBS. We also found a process to recover the AF order from VBS by increasing Jk in a wide range of frustration strength. Our work may provide predictions for future experimental observation of new processes of quantum phase transitions in frustrated heavy-fermion compounds.
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