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首页> 外文期刊>The European physical journal, B. Condensed matter physics >Systematic effective field theory investigation of spiral phases in hole-doped antiferromagnets on the honeycomb lattice
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Systematic effective field theory investigation of spiral phases in hole-doped antiferromagnets on the honeycomb lattice

机译:蜂窝晶格上掺杂空穴的反铁磁体螺旋相的系统有效场理论研究

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摘要

Motivated by possible applications to the antiferromagnetic precursor of the high-temperature superconductor Na_χ CoO_2 -yH_2O, we use a systematic low-energy effective field theory for magnons and holes to study different phases of doped antiferromagnets on the honeycomb lattice. The effective action contains a leading single-derivative term, similar to the Shraiman-Siggia term in the square lattice case, which gives rise to spirals in the staggered magnetization. Depending on the values of the low-energy pa_rameters, either a homogeneous phase with four or a spiral phase with two filled hole pockets is energetically favored. Unlike in the square lattice case, at leading order the effective action has an accidental continu_ous spatial rotation symmetry. Consequently, the spiral may point in any direction and is not necessarily aligned with a lattice direction.
机译:受可能应用于高温超导体Na_χCoO_2 -yH_2O的反铁磁前驱体的影响,我们针对磁振子和空穴使用系统的低能有效场理论,研究了蜂窝晶格上掺杂反铁磁的不同相。有效动作包含一个前导单导数项,类似于在方格情况下的Shraiman-Siggia项,它在交错磁化强度中产生螺旋。取决于低能量参数的值,在能量上优选具有四个的均相或具有两个填充的空穴的螺旋相。与方格情况不同,在领先顺序下,有效动作具有意外的连续空间旋转对称性。因此,螺旋线可以指向任何方向,并且不一定与晶格方向对齐。

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