arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1902.04680cond-mat.str-el
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量子工程近藤晶格

Quantum Engineered Kondo Lattices

Jeremy Figgins, Laila S. Mattos, Warren Mar, Yi-Ting Chen, Hari C. Manoharan, Dirk K. Morr

摘要:

原子操纵技术的最新进展为研究强关联电子材料的非常规性质和复杂相态提供了一种新的自下而上的方法。通过设计包含数万至数千个具有定制电子或磁性的原子的人工凝聚态系统,探索量子多体效应--其存在在于强相关材料的核心--随着系统的尺寸从纳米级增加到中尺度,已经成为可能。在这里,我们从理论和实验两方面研究了纳米级近藤晶格的量子工程-近藤液滴-重费米子材料的纳米级副本。我们证明,通过改变液滴的真实空间几何形状,不仅可以创建相干耦合的近藤液滴,其性质渐近接近量子相干近藤晶格,而且还可以显着增加或减少液滴的近藤温度。此外,我们报告发现一种新的量子现象-近藤回声-一个签名的液滴含有近藤孔作为空间扩展的,量子相干近藤云相关性的直接探针。

英文摘要:

Recent advances in atomic manipulation techniques have provided a novel bottom-up approach to investigating the unconventional properties and complex phases of strongly correlated electron materials. By engineering artificial condensed matter systems containing tens to thousands of atoms with tailored electronic or magnetic properties, it has become possible to explore how quantum many-body effects---whose existence lies at the heart of strongly correlated materials---emerge as the size of a system is increased from the nanoscale to the mesoscale. Here we investigate both theoretically and experimentally the quantum engineering of nanoscopic Kondo lattices -- Kondo droplets -- that exemplify nanoscopic replicas of heavy-fermion materials. We demonstrate that by changing a droplet's real space geometry, it is possible to not only create coherently coupled Kondo droplets whose properties asymptotically approach those of a quantum-coherent Kondo lattice, but also to markedly increase or decrease the droplet's Kondo temperature. Furthermore we report on the discovery of a new quantum phenomenon -- the Kondo echo -- a signature of droplets containing Kondo holes functioning as direct probes of spatially extended, quantum-coherent Kondo cloud correlations.

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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