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arXiv 1107.4401cond-mat.str-el
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三角晶格上周期Anderson模型中载流子向部分无序态的掺杂

Carrier doping to a partially disordered state in the periodic Anderson model on a triangular lattice

Satoru Hayami, Masafumi Udagawa, Yukitoshi Motome

摘要:

在零温下,利用Hartree-Fock近似,研究了三角晶格上周期性Anderson模型中空穴和电子掺杂对半填充的影响。在半填充时,系统呈现出部分无序的绝缘状态,其中共线的反铁磁有序的未受挫折的蜂窝子网络上共存的状态在其余的网站。我们发现,载流子掺杂不稳定的部分无序状态,导致在一个相分离的掺杂金属态具有不同的磁序。部分无序状态被限制在半填充的绝缘情况下,而其金属对应物是作为一个亚稳态在一个狭窄的电子掺杂区域。

英文摘要:

We investigate the effect of hole and electron doping to half-filling in the periodic Anderson model on a triangular lattice by the Hartree-Fock approximation at zero temperature. At half-filling, the system exhibits a partially disordered insulating state, in which a collinear antiferromagnetic order on an unfrustrated honeycomb subnetwork coexists with nonmagnetic state at the remaining sites. We find that the carrier doping destabilizes the partially disordered state, resulting in a phase separation to a doped metallic state with different magnetic order. The partially disordered state is restricted to the half-filled insulating case, while its metallic counterpart is obtained as a metastable state in a narrow electron doped region.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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