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arXiv 1209.1810cond-mat.str-el
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Edwards模型中的相分离

Phase separation in the Edwards model

S. Ejima, S. Sykora, K. W. Becker, H. Fehske

摘要:

在爱德华兹提出的模型中,关联背景介质中电荷输运的性质可以用耦合到玻色子的无自旋费米子来描述。结合数值密度矩阵重整化群和基于解析投影的重整化方法,我们研究了一维Edwards模型的基态相图。在临界玻色子频率以下,任何长程序都消失了,系统变成金属的。如果将载流子耦合到慢量子玻色子上,友永-卢廷格液体是有吸引力的,最终为相分离态腾出空间,就像t-J模型一样。从吸引力的Tomonaga-Luttinger液体分离排斥的相边界是从长波长的电荷相关性确定的,而费米子分离表示由一个消失的逆压缩性。在接近相分离的光电能谱发展强烈的异常。

英文摘要:

The nature of charge transport within a correlated background medium can be described by spinless fermions coupled to bosons in the model introduced by Edwards. Combining numerical density matrix renormalization group and analytical projector-based renormalization methods we explore the ground-state phase diagram of the Edwards model in one dimension. Below a critical boson frequency any long-range order disappears and the system becomes metallic. If the charge carriers are coupled to slow quantum bosons the Tomonaga-Luttinger liquid is attractive and finally makes room for a phase separated state, just as in the t-J model. The phase boundary separating repulsive from the attractive Tomonaga-Luttinger liquid is determined from long-wavelength charge correlations, whereas fermion segregation is indicated by a vanishing inverse compressibility. On approaching phase separation the photoemission spectra develop strong anomalies.

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