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arXiv 2108.03421cond-mat.mes-hallcond-mat.str-el
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铁表面共振的强动量相关电子-磁振子重整化

Strong Momentum-Dependent Electron-Magnon Renormalization of a Surface Resonance on Iron

Beatrice Andres, Martin Weinelt, Hubert Ebert, Jürgen Braun, Alex Aperis, Peter M. Oppeneer

摘要:

从铁磁体的超快磁化动力学到超导体中的库珀配对,费米子准粒子与磁振子的耦合对于广泛的过程都是必不可少的。虽然磁振子能量通常比声子能量大得多,但到目前为止,它们在铁磁金属中的电子带重整化效应表明准粒子相互作用明显较弱。在这里,使用自旋和角度分辨的光电发射,我们显示了一个非常强大的重整化导致复制带形成的铁表面共振在~200毫电子伏。它的强磁性线性二向色性揭示了能量重整化的磁性本质和动量依赖性。通过确定频率和动量依赖的自能,由于通用电子玻色子相互作用计算得到的电子光谱函数,我们表明,表面态副本的形成是一致的强耦合的光学自旋波在Fe薄膜。

英文摘要:

The coupling of fermionic quasiparticles to magnons is essential for a wide range of processes, from ultrafast magnetization dynamics in ferromagnets to Cooper pairing in superconductors. Although magnon energies are generally much larger than phonon energies, up to now their electronic band renormalization effect in ferromagnetic metals suggests a significantly weaker quasiparticle interaction. Here, using spin- and angle-resolved photoemission, we show an extraordinarily strong renormalization leading to replica-band formation of an iron surface resonance at ~200 meV. Its strong magnetic linear dichroism unveils the magnetic nature and momentum dependence of the energy renormalization. By determining the frequency- and momentum-dependent self-energy due to generic electron-boson interaction to compute the resultant electron spectral function, we show that the surface-state replica formation is consistent with strong coupling to an optical spin wave in a Fe thin film.

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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