论文标题
高$ T_C $铜氧化物中量子集体激发的电子孔不对称
Electron-hole asymmetry of quantum collective excitations in high-$T_c$ copper oxides
论文作者
论文摘要
我们进行了一项系统的研究研究，对规范单频段哈伯德的集体自旋和电荷激发，$ t $ - $ J $ - $ U $，以及$ t $ - $ j $ J $高温铜氧化物超导体的型号，无论是在电子和孔供孔的一侧的相图。最近开发的变分波函数方法，加上费尔米温味的逆数量的扩展。这三个模型均表现出磁性激发的大量电子孔不对称，并具有强劲的帕拉格诺（Paramagnon），可用于孔掺杂，并与可用的共振剂无弹性$ x $ ray-ray-ray-ray-ray-ray散射数据的散射数据。 $ t $ - $ j $型号在磁性光谱中产生了额外的高能峰，在光谱中未明确鉴定。对于所有被考虑的汉密尔顿人，动力电荷易感性都包含孔和电子掺杂的连贯模式，并且由现场库仑排斥力控制的整体带宽重新归一化。远离强耦合极限，在相图的电子掺杂一侧，抗铁磁有序趋势更为明显。
We carry out a systematic study of collective spin- and charge excitations for the canonical single-band Hubbard, $t$-$J$-$U$, and $t$-$J$ models of high-temperature copper-oxide superconductors, both on electron- and hole-doped side of the phase diagram. Recently developed variational wave function approach, combined with the expansion in inverse number of fermionic flavors, is employed. All three models exhibit a substantial electron-hole asymmetry of magnetic excitations, with a robust paramagnon emerging for hole-doping, in agreement with available resonant inelastic $x$-ray scattering data for the cuprates. The $t$-$J$ model yields additional high-energy peak in the magnetic spectrum that is not unambiguously identified in spectroscopy. For all considered Hamiltonians, the dynamical charge susceptibility contains a coherent mode for both hole- and electron doping, with overall bandwidth renormalization controlled by the on-site Coulomb repulsion. Away from the strong-coupling limit, the antiferromagnetic ordering tendency is more pronounced on electron-doped side of the phase diagram.
