Evolution of the fermi surface across a magnetic order-disorder transition in the two-dimensional Kondo lattice model: A dynamical cluster approach
Evolution of the fermi surface across a magnetic order-disorder transition in the two-dimensional Kondo lattice model: A dynamical cluster approach
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DOI：
10.1103/physrevlett.101.066404
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发表时间：
2008-08-08
影响因子：
8.6
通讯作者：
Assaad, F. F.
中科院分区：
文献类型：
--
作者：
Martin, L. C.;Assaad, F. F.
我们使用动态团簇近似，在多达16个轨道的团簇上使用量子蒙特卡罗团簇求解器，研究了二维掺杂Kondo晶格模型中费米表面在磁性有序-无序跃迁中的演化。在顺磁相位，我们观察到具有大卢廷格体积的一般杂化重费米子带结构。在反铁磁阶段，重费米子带下降到费米表面以下，让位于以k = (pi/2, pi/2)和等效点为中心的空穴。在这个阶段，近藤筛选不会被破坏，但是最终得到的费米表面的拓扑结构是自旋密度波近似，其中局域自旋被冻结。
We use the dynamical cluster approximation, with a quantum Monte Carlo cluster solver on clusters of up to 16 orbitals, to investigate the evolution of the Fermi surface across the magnetic order-disorder transition in the two-dimensional doped Kondo lattice model. In the paramagnetic phase, we observe the generic hybridized heavy-fermion band structure with large Luttinger volume. In the antiferromagnetic phase, the heavy-fermion band drops below the Fermi surface giving way to hole pockets centered around k = (pi/2, pi/2) and equivalent points. In this phase Kondo screening does not break down, but the topology of the resulting Fermi surface is that of a spin-density wave approximation in which the localized spins are frozen.