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arXiv 1111.1372cond-mat.str-el
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高$T_c$铜氧化物的双组分自旋费米子模型:在中子散射和ARPES实验中的应用

Two component spin-fermion model for high-$T_c$ cuprates: Applications to neutron scattering and ARPES experiments

Yunkyu Bang

摘要:

受高$T_c$铜氧化物中中子散射实验的启发,我们提出了一个以局域自旋和巡游费米子为独立自由度的最小唯象模型--双组分自旋费米子模型.我们对动态自旋关联函数的计算成功地描述了令人困惑的中子实验数据,并表明:(1)磁激发的向上色散分支主要来自局域自旋激发;(2)磁激发的向下色散分支来自费米子的集体粒子-空穴激发;(3)共振模式是两个自由度的混合。使用具有相同参数集的相同模型,我们计算了重整化准粒子色散,并成功地再现了角分辨光电子能谱(ARPES)实验的关键特征之一,即,费米子准粒子色散中的高能扭折结构进一步支持了双分量自旋费米子现象。

英文摘要:

Motivated by neutron scattering experiments in the high-$T_c$ cuprates, we propose the two-component spin-fermion model as a minimal phenomenological model which has both local spins and itinerant fermions as independent degrees of freedom. Our calculations of the dynamic spin correlation function provide a successful description of the puzzling neutron experiment data and show that: (1) the upward dispersion branch of magnetic excitations is mostly due to the local spin excitations; (2) the downward dispersion branch is from collective particle-hole excitations of fermions; and (3) the resonance mode is a mixture of both degrees of freedom. Using the same model with the same set of parameters we calculated the renormalized quasiparticle dispersion and successfully reproduced one of the key features of the angle resolved photoemission spectroscopy (ARPES) experiments, i.e., the high energy kink structure in the fermion quasiparticle dispersion, hence further support the two component spin-fermion phenomenology.

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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