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arXiv 1303.2893cond-mat.supr-concond-mat.mtrl-scicond-mat.str-el
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用非平衡光谱法寻找铜酸盐中的配对胶

In search for the pairing glue in cuprates by non-equilibrium optical spectroscopy

Federico Cilento, Stefano Dal Conte, Giacomo Coslovich, Francesco Banfi, Gabriele Ferrini, Hiroshi Eisaki, Martin Greven, Andrea Damascelli, Dirk van der Marel,… 展开作者

Federico Cilento, Stefano Dal Conte, Giacomo Coslovich, Francesco Banfi, Gabriele Ferrini, Hiroshi Eisaki, Martin Greven, Andrea Damascelli, Dirk van der Marel, Fulvio Parmigiani, Claudio Giannetti

摘要:

在强关联材料中,费米准粒子与不同自由度的耦合,如晶格振动和电子源的玻色子激发,会显著影响材料的电子和光学性质。宽带超快光谱学是研究准粒子与电子或声子集体激发之间微妙相互作用的重要技术,它通过不同的特征时间尺度和光谱响应来揭示准粒子与集体激发之间的相互作用。通过研究Y-Bi 2212晶体在0.5-2 eV能量范围内光学性质的飞秒动力学,我们解开了电子和声子对广义电子玻色子Eliashberg函数的贡献,表明电子激发的光谱分布,如自旋涨落和电流回路,并且它们与准粒子的相互作用的强度可以解释超导相变的高临界温度。最后,我们讨论了如何使用这种技术可以扩展到欠掺杂的区域的铜酸盐的相图,在其中的准粒子态密度的赝隙打开。超短光脉冲与非常规超导体相互作用的微观模拟将是未来材料科学的关键挑战之一,最终导致对飞秒时间尺度上的电子关联在控制动力学中的作用的充分理解。

英文摘要:

In strongly correlated materials the electronic and optical properties are significantly affected by the coupling of fermionic quasiparticles to different degrees of freedom, such as lattice vibrations and bosonic excitations of electronic origin. Broadband ultrafast spectroscopy is emerging as the premier technique to unravel the subtle interplay between quasiparticles and electronic or phononic collective excitations, by their different characteristic timescales and spectral responses. By investigating the femtosecond dynamics of the optical properties of Y-Bi2212 crystals over the 0.5-2 eV energy range, we disentangle the electronic and phononic contributions to the generalized electron-boson Eliashberg function, showing that the spectral distribution of the electronic excitations, such as spin fluctuations and current loops, and the strength of their interaction with quasiparticles can account for the high critical temperature of the superconducting phase transition. Finally, we discuss how the use of this technique can be extended to the underdoped region of the phase diagram of cuprates, in which a pseudogap in the quasiparticle density of states opens. The microscopic modeling of the interaction of ultrashort light pulses with unconventional superconductors will be one of the key challenges of the next-years materials science, eventually leading to the full understanding of the role of the electronic correlations in controlling the dynamics on the femtosecond timescale.

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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