由Wigner极化子晶体不稳定性引起的Wigner极化子电荷密度波与费米液体的耦合：高温超导体中一种可能的配对机制
The Coupling of a Wigner Polaronic Charge Density Wave with a Fermi Liquid Arising from the Instability of a Wigner Polaron Crystal: a Possible Pairing Mechanism in High Tc Superconductors
摘要：
我们报告的证据表明，在高Tc铜氧化物超导体的金属相的结果从准2D电子气的密度低于或大于临界密度的维格纳极化晶体的形成的不稳定性。电子气在1）密度为1/8的极化子气体和2）限制在量子条纹超晶格中的费米液体之间经历微观相分离。在T<T ~*~1.4 Tc时，二维极化子气体凝聚成成对的一维Wigner电荷密度波（CDW）。在超导临界温度以下，这两种类型的载流子是耦合的，并且配对机制涉及虚极化子对。这种机制驱动冷凝物达到费米液体的最大临界温度。此外，本文提出的配对模型正确地预测了Tc对凝聚体密度ns/m*（Uemura图）的依赖关系，以及同位素效应的变化。
英文摘要：
We report evidence that the metallic phase in high Tc cuprate superconductors results from an instability of the quasi 2D-electron gas at densities lower or larger than the critical density for the formation of a Wigner polaronic crystal. The electron gas undergoes a microscopic phase separation between 1) a polaron gas with density 1/8 at the Wigner localization limit and 2) a Fermi liquid confined in a superlattice of quantum stripes. The 2D-polaron gas condenses into a paired unidimensional Wigner charge density wave (CDW) at T<T*~1.4 Tc. Below the superconducting critical temperature the two types of carriers are coupled, and the pairing mechanism involves virtual polaron pairs. This mechanism drives the condensate to the maximum critical temperature for a Fermi liquid. In addition the pairing model proposed here correctly predicts the dependence of Tc on the condensate density ns/m* (Uemura plot), and the variation of the isotope effect.
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