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arXiv 2104.14588cond-mat.str-el
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关联系统非相干区DC电导率的普适磁振荡

Universal magnetic oscillations of DC conductivity in the incoherent regime of correlated systems

Jaksa Vucicevic, Rok Zitko

摘要:

利用动力学平均场论,充分考虑了通过Peierls替代引入的场的轨道效应,研究了方形晶格上的哈伯德模型中直流电导率与磁场的依赖关系。除了传统的Shubnikov-de Haas量子振荡,与准粒子的相干回旋运动和一个定义良好的费米表面的存在下,我们发现一个额外的振荡分量具有较高的频率,对应于布里渊区的总面积。这些打破范式的振荡出现在高温下。这一发现与最近对石墨烯超晶格的实验定性一致。我们阐明了电流顶点的非对角元素和电子态的不相干性的关键作用,并解释了温度和掺杂的趋势。

英文摘要:

Using the dynamical mean field theory we investigate the magnetic field dependence of DC conductivity in the Hubbard model on the square lattice, fully taking into account the orbital effects of the field introduced via the Peierls substitution. In addition to the conventional Shubnikov-de Haas quantum oscillations, associated with the coherent cyclotron motion of quasiparticles and the presence of a well-defined Fermi surface, we find an additional oscillatory component with a higher frequency that corresponds to the total area of the Brillouin zone. These paradigm-breaking oscillations appear at elevated temperature. This finding is in excellent qualitative agreement with the recent experiments on graphene superlattices. We elucidate the key roles of the off-diagonal elements of the current vertex and the incoherence of electronic states, and explain the trends with respect to temperature and doping.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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