Low-frequency quantum oscillations from interactions in layered metals
Low-frequency quantum oscillations from interactions in layered metals
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DOI：
10.1103/physrevresearch.3.l042009
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发表时间：
2021-03
影响因子：
4.2
通讯作者：
Andrew A. Allocca;N. Cooper
中科院分区：
文献类型：
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作者：
Andrew A. Allocca;N. Cooper
由弱耦合堆叠层组成的金属具有沿堆叠方向尺寸略有变化的费米面。这出现在磁场磁化强度的德哈斯-范阿尔芬 (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。我们表明，对于具有足够高迁移率的层状材料，库仑相互作用可以对 dHvA 振荡的形式产生巨大影响：通常在两个大频率的微小差异处也存在振荡。我们确定了这种效应的大小和形式，并表明它探测了层状材料内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在超纯铜铁矿中异常低频 dHvA 振荡的实验观察结果。
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.