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arXiv 1012.1186cond-mat.mes-hallcond-mat.other
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扫描隧道显微镜中分子电致发光的密度矩阵方法

A density matrix approach for the electroluminescence of molecules in a scanning tunneling microscope

Guangjun Tian, Jicai Liu, Yi Luo

摘要:

在扫描隧道显微镜中,纳米腔中分子的电致发光具有许多有趣但无法解释的特征。本文提出了一种基于密度矩阵的理论方法来描述电子隧穿和局部表面等离子体激元激发同时引起的金属表面附近分子的电致发光。揭示了外偏压依赖的电致发光的物理机制。强调了局域表面等离子体激元在电致发光中的重要作用。卟啉衍生物的计算再现了相应的实验光谱,很好地解释了所观察到的不寻常的发射光谱分布的大变化。这种理论方法在分子电子学和光子学器件的设计中有着广泛的应用。

英文摘要:

The electroluminescence of molecules confined inside a nanocavity in the scanning tunneling microscopy possesses many intriguing but unexplained features. We present here a general theoretical approach based on the density matrix formalism to describe the electroluminescence from molecules near a metal surface induced by both electron tunneling and local surface plasmon excitations simultaneously. It reveals the underlying physical mechanism for the external bias dependent electroluminescence. The important role played by the local surface plasmon on the electroluminescence is highlighted. Calculations for porphyrin derivatives have reproduced corresponding experimental spectra and nicely explained the observed unusual large variation of emission spectral profiles. This general theoretical approach can find many applications in the design of molecular electronic and photonic devices.

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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