arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2409.16616physics.opticscond-mat.mes-hallcond-mat.mtrl-sci
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Feibelman量子表面响应函数的宽带测量

Broadband measurement of Feibelman's quantum surface response functions

Zeling Chen, Shu Yang, Zetao Xie, Jinbing Hu, Xudong Zhang, Yipu Xia, Yonggen Shen, Huirong Su, Maohai Xie, Thomas Christensen, Yi Yang

AI总结:

针对Feibelman d参数测量稀缺且光谱窗口窄的问题,提出通用宽带椭偏方法测量金-空气界面可见-紫外范围的d参数,观测到频率相关的电子溢出/内流及Bennett模式,为量子表面响应研究和应用提供支持。

摘要:

Feibelman d参数是局域体介电常数的介观补充,描述界面的量子光学表面响应,包括非局域性、电子溢出和内流以及表面诱导的朗道阻尼。它已被纳入宏观麦克斯韦框架,以便于纳米级电磁现象的建模和理解,因此需要为纳米光学中感兴趣的界面编制d参数数据库。然而,d参数的精确第一性原理计算面临计算挑战,而现有d参数测量稀缺且局限于窄光谱窗口。我们展示了一种通用宽带椭偏方法,可在可见-紫外范围内测量金-空气界面的d参数。研究发现金在不同频率下会发生电子溢出和内流,还在约2.5 eV处观测到金的Bennett模式(一种与d参数极点相关的表面偶极共振)。我们的测量产生了d参数,并通过其无源性和Kramers-Kronig因果性分析进一步验证。这项工作推进了对量子表面响应的理解,并可能推动增强电子场发射等应用。

英文摘要:

The Feibelman $d$-parameter, a mesoscopic complement to the local bulk permittivity, describes quantum optical surface responses for interfaces, including nonlocality, spill-in and-out, and surface-enabled Landau damping. It has been incorporated into the macroscopic Maxwellian framework for convenient modeling and understanding of nanoscale electromagnetic phenomena, calling for the compilation of a $d$-parameter database for interfaces of interest in nano-optics. However, accurate first-principles calculations of $d$-parameters face computational challenges, whereas existing measurements of $d$-parameters are scarce and restricted to narrow spectral windows. We demonstrate a general broadband ellipsometric approach to measure $d$-parameters at a gold--air interface across the visible--ultraviolet regimes. Gold is found to spill in and spill out at different frequencies. We also observe gold's Bennett mode, a surface-dipole resonance associated with a pole of the $d$-parameter, around 2.5 eV. Our measurements give rise to and are further validated by the passivity and Kramers--Kronig causality analysis of $d$-parameters. Our work advances the understanding of quantum surface response and may enable applications like enhanced electron field emission.

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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