Departamento de Física Teórica de la Materia Condensada, Condensed Matter Physics Center (IFIMAC) and Instituto Nicolás Cabrera, Universidad Autónoma de Madrid, Madrid 28049, Spain.
Phys Rev Lett. 2013 Sep 20;111(12):126403. doi: 10.1103/PhysRevLett.111.126403.
We study charge ordering driven by Coulomb interactions on triangular lattices relevant to the Wigner-Mott transition in two dimensions. Dynamical mean-field theory reveals the pinball liquid phase, a charge ordered metallic phase containing quasilocalized (pins) coexisting with itinerant (balls) electrons. Based on an effective periodic Anderson model for this phase, we find an antiferromagnetic Kondo coupling between pins and balls and strong quasiparticle renormalization. Non-Fermi liquid behavior can occur in such charge ordered systems due to the spin-flip scattering of itinerant electrons off the pins in analogy with heavy fermion compounds.
我们研究了二维威格纳-莫特转变中相关的三角格子上库仑相互作用驱动的电荷有序。动态平均场理论揭示了弹球液体相，这是一种电荷有序的金属相，包含准局域（弹球）和巡游（小球）电子共存。基于这个相的有效周期性安德森模型，我们发现了弹球和小球之间的反铁磁 Kondo 耦合以及强准粒子重整化。由于巡游电子从弹球上的自旋翻转散射，类似于重费米子化合物，这种电荷有序体系可能表现出非费米液体行为。
