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arXiv 1701.04795cond-mat.supr-con
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MgB2中声子介导的$σ$ - $π$带间散射的实时观测

Real-time Observation of Phonon-Mediated $σ$-$π$ Interband Scattering in MgB2

Edoardo Baldini, Andreas Mann, Lara Benfatto, Emmanuele Cappelluti, Angela Acocella, Vyacheslav M. Silkin, Sergey V. Eremeev, Alexey B. Kuzmenko, Simone Borroni… 展开作者

Edoardo Baldini, Andreas Mann, Lara Benfatto, Emmanuele Cappelluti, Angela Acocella, Vyacheslav M. Silkin, Sergey V. Eremeev, Alexey B. Kuzmenko, Simone Borroni, Teng Tan, Xiaoxiang Xi, Francesco Zerbetto, Roberto Merlin, Fabrizio Carbone

摘要:

在具有各向异性电子结构的系统中,例如层状材料石墨、石墨烯和铜酸盐,脉冲光激发可以相干地激发特定的玻色子模式,对出现的电子性质具有奇异的后果。在这里,我们表明,人口的E $_{2g}$声子的多带超导体MgB $_2$可以选择性地增强飞秒激光脉冲,导致瞬态控制的σ电子子系统中的载流子的数量。材料的光学常数的非平衡演化是在光谱区域敏感的a-和c-轴等离子体频率和理论建模,揭示了在MgB $_2$的$σ$ - $π$带间散射机制的细节。

英文摘要:

In systems having an anisotropic electronic structure, such as the layered materials graphite, graphene and cuprates, impulsive light excitation can coherently stimulate specific bosonic modes, with exotic consequences for the emergent electronic properties. Here we show that the population of E$_{2g}$ phonons in the multiband superconductor MgB$_2$ can be selectively enhanced by femtosecond laser pulses, leading to a transient control of the number of carriers in the σ-electronic subsystem. The nonequilibrium evolution of the material optical constants is followed in the spectral region sensitive to both the a- and c-axis plasma frequencies and modeled theoretically, revealing the details of the $σ$-$π$ interband scattering mechanism in MgB$_2$.

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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