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arXiv 1608.02750cond-mat.mtrl-scicond-mat.mes-hall
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石墨烯的电子结构动力学

Electronic-structural Dynamics in Graphene

Isabella Gierz, Andrea Cavalleri

摘要:

我们回顾了我们最近的时间和角度分辨光电子能谱实验,测量光驱动石墨烯的瞬态电子结构。对于近红外泵浦光子能量($\hbarω_{\text{pump}}=950$ meV),我们发现在狄拉克点附近形成了布居数反转态,这可能对太赫兹激光设备和光学放大器的设计感兴趣。在较低的泵浦光子能量($\hbarω_{\text{pump}}<400$毫电子伏),其中带间吸收是不可能的掺杂样品中,我们发现自由载流子吸收的证据。此外,当使中红外脉冲与双层石墨烯的红外活性面内声子($\hbarω_{\text{pump}}=200$ meV)共振时,观察到电子-声子耦合常数的瞬态增强,为报道掺杂富勒烯中的光增强超导性的实验提供了有趣的视角,其中类似的晶格模式被激发。本文综述的所有研究对石墨烯在光电子器件中的应用以及光电子性质的动力学工程具有重要意义。

英文摘要:

We review our recent time- and angle-resolved photoemission spectroscopy experiments, which measure the transient electronic structure of optically driven graphene. For pump photon energies in the near infrared ($\hbarω_{\text{pump}}=950$meV) we have discovered the formation of a population-inverted state near the Dirac point, which may be of interest for the design of THz lasing devices and optical amplifiers. At lower pump photon energies ($\hbarω_{\text{pump}}<400$meV), for which interband absorption is not possible in doped samples, we find evidence for free carrier absorption. In addition, when mid-infrared pulses are made resonant with an infrared-active in-plane phonon of bilayer graphene ($\hbarω_{\text{pump}}=200$meV), a transient enhancement of the electron-phonon coupling constant is observed, providing interesting perspective for experiments that report light-enhanced superconductivity in doped fullerites in which a similar lattice mode was excited. All the studies reviewed here have important implications for applications of graphene in optoelectronic devices and for the dynamical engineering of electronic properties with light.

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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