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arXiv 2103.08617cond-mat.mes-hall
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层状金属中相互作用引起的低频量子振荡

Low-frequency Quantum Oscillations from Interactions in Layered Metals

Andrew A. Allocca, Nigel R. Cooper

摘要:

由弱耦合的堆叠层组成的金属具有沿着堆叠方向尺寸略有变化的费米表面。这出现在具有磁场的磁化强度的de Haas-van Alphen(dHvA)振荡中,作为两个接近的频率,对应于两个极值费米表面横截面积。我们发现,对于层状材料的足够高的流动性,库仑相互作用可以有一个戏剧性的影响的形式的dHvA振荡:一般也有一个振荡在两个大的频率的小差异。我们确定这种效果的大小和形式,并表明,它探测到的层状材料内的库仑相互作用的短程部分。我们认为,这种相互作用效应可以解释最近的实验观察到的异常低频dHvA振荡的超纯铜铁矿。

英文摘要:

Metals composed of weakly-coupled, stacked layers possess a Fermi surface that slightly varies in size along the stacking direction. This appears in de Haas-van Alphen (dHvA) oscillations of the magnetisation with magnetic field as two close frequencies, corresponding to the two extremal Fermi surface cross-sectional areas. We show that, for layered materials of sufficiently high mobility, Coulomb interactions can have a dramatic effect on the form of the dHvA oscillations: there is also generically an oscillation at the small difference of the two large frequencies. We determine the size and form of this effect, and show that it probes the short-range part of the Coulomb interactions within the layered material. We argue that this interaction effect may explain recent experimental observations of anomalous low-frequency dHvA oscillations in the ultrapure delafossites.

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