论文标题
多频段费米液体的命运，与关键的$ ϕ^4 $玻色子相结合
Fate of a multiple-band Fermi liquid that is coupled with critical $ϕ^4$ bosons
论文作者
论文摘要
电子能带的多种频段性质会导致固体中新型的物理作用。在本文中，我们阐明了具有一对电子和孔费米表面（FSS）的费米系统的物理特性，其耦合是由关键的U（1）玻色子场介导的。通过使用单环的重新归一化组分析，我们表明，当玻色子场与破裂的U（1）对称性进行量子相变时，多波段费米系统在其热力学和磁性特性中显示了非Fermi液体（非FL）行为。在量子临界点（QCP）上，两个FS的费米速度将其重新归一致地与玻色子速度相同的临界速度，并且fermion的状态密度（DOS）显示出具有QCP上对数能量依赖性的伪间隙行为。
Multiple-band nature of electronic energy bands leads to novel physical effects in solids. In this paper, we clarify physical properties of a Fermi system with a pair of electron and hole Fermi surfaces (FSs), whose coupling is mediated by a critical U(1) boson field. By using a one-loop renormalization group analysis, we show that when the boson field undergoes a quantum phase transition with broken U(1) symmetry, the multiple-band Fermi system shows a non-Fermi liquid (non-FL) behaviour in its thermodynamic and magnetic properties. At a quantum critical point (QCP), Fermi velocities of the two FSs are renormalized into a same critical velocity as a boson velocity, and the fermion's density of states (DOS) shows a pseudo-gap behaviour with a logarithmic energy dependence at the QCP.
