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首页> 外文期刊>Journal of Low Temperature Physics >New State of Matter: Heavy Fermion Systems, Quantum Spin Liquids, Quasicrystals, Cold Gases, and High-Temperature Superconductors
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New State of Matter: Heavy Fermion Systems, Quantum Spin Liquids, Quasicrystals, Cold Gases, and High-Temperature Superconductors

机译：新的物品状态：重型铁缆源性系统，量子旋转液体，拟旋属，冷气体和高温超导体

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We report on a new state of matter manifested by strongly correlated Fermi systems including various heavy fermion (HF) metals, two-dimensional quantum liquids such as He films, certain quasicrystals, and systems behaving as quantum spin liquids. Generically, these systems can be viewed as HF systems or HF compounds, in that they exhibit typical behavior of HF metals. At zero temperature, such systems can experience a so-called fermion condensation quantum phase transition (FCQPT). Combining analytical considerations with arguments based entirely on experimental grounds, we argue and demonstrate that the class of HF systems is characterized by universal scaling behavior of their thermodynamic, transport, and relaxation properties. That is, the quantum physics of different HF compounds is found to be universal, emerging irrespective of the individual details of their symmetries, interactions, and microscopic structure. This observed universal behavior reveals the existence of a new state of matter manifest in HF compounds. We propose a simple, realistic model to study the appearance of flat bands in two-dimensional ensembles of ultracold fermionic atoms, interacting with coherent resonant light. It is shown that signatures of these flat bands may be found in peculiarities in their thermodynamic and spectroscopic properties. We also show that the FCQPT, in generating flat bands and altering Fermi surface topology, is an essential progenitor of the exotic behavior of the overdoped high-temperature superconductors represented by , whose superconductivity differs from that predicted by the classical Bardeen-Cooper-Schrieffer theory. The theoretical results presented are in good agreement with recent experimental observations, closing the colossal gap between these empirical findings and Bardeen-Cooper-Schrieffer-like theories.
机译：我们报告了由强烈相关的费米系统表现出的新的物质状态，包括各种重型费米（HF）金属，二维量子液体，例如HE膜，某些拟壳和系统，所述系统表现为量子旋转液体。从一体地，这些系统可以被视为HF系统或HF化合物，因为它们表现出HF金属的典型行为。在零温度下，这种系统可以体验所谓的FERMION冷凝量子相变（FCQPT）。与完全基于实验理由的参数结合分析考虑，争论并证明了HF系统的类别的特点是其热力学，运输和放松特性的普遍缩放行为。也就是说，发现不同HF化合物的量子物理学是通用的，而且不论其对称，相互作用和微观结构的个体细节如何。这种观察到的普遍行为揭示了HF化合物中表现出新的物质状态。我们提出了一种简单，现实的模型来研究超替代米子因子的二维集合中的平带的外观，与相干共振光相互作用。结果表明，这些扁平带的签名可以在其热力学和光谱性质中的特性中发现。我们还显示FCQPT，在产生平坦带和改变费米表面拓扑中，是由覆盖的高温超导体的异种行为的基本祖先，其超导电性与经典Bardeen-Cooper-Schrieffer理论的超导不同。呈现的理论结果与最近的实验观察结果吻合良好，依赖于这些经验研究结果和Bardeen-Cooper-Schrieffer的理论之间的巨大差距。

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