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arXiv 2303.12977cond-mat.supr-concond-mat.mtrl-scicond-mat.othercond-mat.str-el
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超导的非简谐理论及其在新兴量子材料中的应用

Anharmonic theory of superconductivity and its applications to emerging quantum materials

Chandan Setty, Matteo Baggioli, Alessio Zaccone

AI总结:

本文综述非简谐退相干与非简谐阻尼对超导性质的理论影响,整合玻色媒介有效理论与BCS、Migdal-Eliashberg理论,并讨论第一性原理实现、实验探测及在氢化物等量子材料中的应用。

摘要:

过去,非简谐性对超导性的作用常常被忽视。近年来,人们认识到,非简谐退相干可能在决定一大类材料的超导性质(电子—声子耦合、临界温度等)方面发挥基础性作用,这些材料包括接近结构软模失稳的体系、非晶固体以及处于极端高压条件下的金属。在此,我们综述非简谐效应作用方面的最新理论进展,尤其是非简谐阻尼的某些普适性质对超导性的影响。我们的重点是将针对玻色媒介的、不依赖微观细节的有效理论,与成熟的BCS理论和Migdal-Eliashberg超导理论相结合。我们详细讨论理论框架、它们在第一性原理方法中的可能实现,以及非简谐退相干的实验探测手段。最后,我们展示若干面向新兴量子材料的具体应用,包括氢化物、铁电体以及具有电荷密度波失稳的体系。

英文摘要:

The role of anharmonicity on superconductivity has often been disregarded in the past. Recently, it has been recognized that anharmonic decoherence could play a fundamental role in determining the superconducting properties (electron-phonon coupling, critical temperature, etc) of a large class of materials, including systems close to structural soft-mode instabilities, amorphous solids and metals under extreme high-pressure conditions. Here, we review recent theoretical progress on the role of anharmonic effects, and in particular certain universal properties of anharmonic damping, on superconductivity. Our focus regards the combination of microscopic-agnostic effective theories for bosonic mediators with the well-established BCS theory and Migdal-Eliashberg theory for superconductivity. We discuss in detail the theoretical frameworks, their possible implementation within first-principles methods, and the experimental probes for anharmonic decoherence. Finally, we present several concrete applications to emerging quantum materials, including hydrides, ferroelectrics and systems with charge density wave instabilities.

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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