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Spectral properties of a partially spin-polarized one-dimensional Hubbard/Luttinger superfluid

机译:部分自旋极化的一维Hubbard / Luttinger超流体的光谱性质

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摘要

We calculate the excitation spectra of a spin-polarized Hubbard chain away from half filling using a high-precision momentum-resolved time-dependent density-matrix renormalization-group method. Focusing on the U<0 case, we present in some detail the single-fermion, pair, density, and spin spectra and discuss how spin-charge separation is altered for this system. The pair spectra show a quasicondensate at a nonzero momentum proportional to the polarization, as expected for this Fulde-Ferrell-Larkin-Ovchinnikov-type superfluid.
机译:我们使用高精度的动量分辨时间相关密度矩阵重新归一化群方法计算了自半填充的自旋极化哈伯链的激发光谱。着眼于U <0情况,我们更详细地介绍了单费米子,对,密度和自旋谱,并讨论了该系统如何改变自旋电荷分离。该对光谱显示出与极化成正比的非零动量下的准凝析物,正如该Fulde-Ferrell-Larkin-Ovchinnikov型超流体所预期的那样。

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