Microscopic Theory of High Temperature Superconductivity in the Cuprates

铜氧化物高温超导的微观理论

• 批准号: 0906530
• 负责人: Chandra Varma
• 金额: $ 27万
• 依托单位: University of California-Riverside
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-15 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0906530&HistoricalAwards=false
• 关键词: Microscopic; Theory; Temperature; Superconductivity; Cuprates

TECHNICAL SUMMARYThis award supports theoretical research and education with the ambitious goal to formulate a consistent microscopic theory of the extraordinary phenomena which have been discovered in high temperature cuprate superconductors. The PI sees that besides the high superconducting transition temperatures, two new states of matter have been discovered in the cuprates: a strange normal metallic state with extraordinary but simply characterized properties, and a pseudogap phase in which the extrapolated normal ground state appears to have an anisotropic gap tied to the chemical potential. The PI will build on a microscopic approach which predicted a particular form of broken time-reversal symmetry in the pseudogap phase, and derived a quantum critical spectrum of the order parameter fluctuations, which leads to the phenomenological marginal Fermi-liquid consistent with the "strange metal" state, as well as couples to fermions with attraction in the d-wave pairing channel. The PI aims to solidify aspects of these developments and to attempt an understanding of aspects which are not understood. These include (i) verification of the analytic results for the quantum fluctuations by Monte Carlo calculations, (ii) inversion of the ARPES data to deduce the pairing spectrum to test the theory, (iii) understanding how the time-reversal breaking state observed in recent experiments necessarily leads to an anisotropic gap in the "pseudogap" state, as well as other issues relevant to experiment.The PI aims to achieve a firm enough theory backed by experimental results and with clear and falsifiable predictions so that a consensus in the important field of cuprate high temperature superconductivity can be achieved.The PI will also take a close look at the burgeoning experimental results on the newly discovered Fe-Pnictides and formulate a model for their understanding.NON-TECHNICAL SUMMARYThis award supports theoretical research and education with the ambitious goal to formulate a consistent theory of the extraordinary phenomena which have been discovered in high temperature cuprate superconductor materials. Apart from the persistence of superconductivity to much higher temperatures than the other superconducting materials known at the time of the discovery of the cuprates, the cuprate materials exhibit a host of interesting puzzles including the nature of the unusual metallic states that give way to the superconducting state as the temperature is lowered. The PI will build on his recent controversial ideas that have support in the experimental data. His work may lead to new insights into high temperature superconductivity and how to discover new materials that are superconducting at much higher temperatures, perhaps room temperature. In the superconducting state, superconductors can carry electric power without dissipation. A room temperature superconductor would enable efficient power transmission and save energy.

技术摘要这一奖项支持理论研究和教育，其雄心勃勃的目标是制定一致的微观现象理论，该理论是在高温丘陵超导体中发现的。 PI认为，除了高超导过渡温度之外，在丘比特中发现了两个新的物质状态：一种奇怪的正常金属状态，具有非凡但简单地表征性能，而假相阶段则是伪造的正常基态似乎具有与化学电位相关的各向异性间隙。 PI将建立在微观方法上，该方法预测了伪随阶段中特定形式的时间反向对称性的形式，并得出了顺序参数波动的量子临界频谱，从而导致现象学边缘学的fermi-liciid与“奇怪的金属”状态以及与Fermions一起canderations canderations contraction contraction contraction contraction。 PI旨在巩固这些发展的各个方面，并尝试了解未知的方面。 These include (i) verification of the analytic results for the quantum fluctuations by Monte Carlo calculations, (ii) inversion of the ARPES data to deduce the pairing spectrum to test the theory, (iii) understanding how the time-reversal breaking state observed in recent experiments necessarily leads to an anisotropic gap in the "pseudogap" state, as well as other issues relevant to experiment.The PI aims to实现一个足够坚定的理论，并通过实验结果和可伪造的预测来支持，以便可以在重要的高温高温领域达成共识，可以仔细研究一下新发现的Fe-pnicts的新兴实验结果，并为他们的理解提供了一个始终的研究，并培养了一个始终的研究，并构成了一致的启发。在高温库层超导体材料中发现的非凡现象。除了在发现丘比特时已知的其他超导材料与其他超导材料的持续存在之外，丘比特材料还表现出许多有趣的难题，包括不寻常的金属状态的性质，这些状态可以使超导状态在温度下降低。 PI将基于他最近有争议的想法，这些想法在实验数据中得到了支持。他的工作可能会导致对高温超导性的新见解，以及如何在更高温度（也许是室温）下发现超导的新材料。在超导状态下，超导体可以携带电力而不会消散。室温超导体将实现有效的电力传输并节省能源。