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arXiv 1306.5498cond-mat.str-el
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强关联电子系统中赝能隙的形成和量子相变

Pseudogap Formation and Quantum Phase Transition in Strongly-Correlated Electron Systems

Chyh-Hong Chern

摘要:

赝能隙的形成是强关联超导体中普遍存在的现象,如铜氧化物、重费米子超导体和铁磷属元素化物。当系统冷却时,在进入超导相之前,在激发光谱中打开能隙。超导电性的成因及其与超导电性的关系一直是凝聚态物理中最具挑战性的问题。在这里,使用铜酸盐作为模型,我们证明了赝能隙的形成是由于大量的规范电子之间的相互作用,其中的规范玻色子的质量,确定相互作用的长度尺度,是从母体化合物继承的残余反铁磁波动的后果。从实验数据中提取,我们预测在赝能隙跃迁消失的临界掺杂处存在属于2D XY普适类的量子相变。

英文摘要:

Pseudogap formation is an ubiquitous phenomena in strongly-correlated superconductors, for example cuprates, heavy-fermion superconductors, and iron pnictides. As the system is cooled, an energy gap opens in the excitation spectrum before entering the superconducting phase. The origin of formation and the relevancy to the superconductivity remains unclear, which is the most challenging problem in condensed matter physics. Here, using the cuprate as a model, we demonstrate that the formation of pseudogap is due to a massive gauge interaction between electrons, where the mass of the gauge boson, determining the interaction length scale, is the consequence of the remnant antiferromagnetic fluctuation inherited from the parent compounds. Extracting from experimental data, we predict that there is a quantum phase transition belonging to the 2D XY universality class at the critical doping where pseudogap transition vanishes.

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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