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Gapless regime in the charge density wave phase of the finite dimensional Falicov-Kimball model

机译：有限维Falicov-Kimball模型的电荷密度波相中的无间隙状态

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摘要

The ground-state density of states of the half-filled Falicov-Kimball model contains a charge-density-wave gap. At finite temperature, this gap is not immediately closed, but is rather filled in by subgap states. For a specific combination of parameters, this leads to a stable phase where the system is in an ordered charge-density-wave phase, but there is high density of states at the Fermi level. We show that this property can be, in finite dimensions, traced to a crossing of sharp states resulting from the single particle excitations of the localized subsystem. The analysis of the inverse participation ratio points to a strong localization in the discussed regime. However, the pronounced subgap density of states can still lead to a notable increase of charge transport through a finite size system. We show this by focusing on the transmission in heterostructures where a Falicov-Kimball system is sandwiched between two metallic leads.
机译：半填充Falicov-Kimball模型的状态基态密度包含一个电荷密度波隙。在有限的温度下，该间隙不会立即闭合，而是由子间隙状态填充。对于特定的参数组合，这将导致系统处于有序电荷密度波相位的稳定相位，但是费米能级的状态密度很高。我们表明，该属性可以在有限的维度上追溯到由于局部子系统的单粒子激发而导致的尖锐状态的交叉。对反向参与率的分析表明，在所讨论的体制中存在强烈的局限性。然而，显着的亚能隙状态密度仍然可以导致通过有限尺寸系统的电荷传输显着增加。我们通过关注异质结构中的传输来展示这一点，其中Falicov-Kimball系统夹在两个金属引线之间。

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