Plasmon Character Index: An Accurate and Efficient Metric for Identifying and Quantifying Plasmons in Molecules
- 22 September 2021
- journal article
- research article
- Published by American Chemical Society (ACS) in The Journal of Physical Chemistry Letters
- Vol. 12 (38), 9391-9397
- https://doi.org/10.1021/acs.jpclett.1c02645
Abstract
Plasmons, which are collective and coherent oscillations of charge carriers driven by an external field, play an important role in applications such as solar energy harvesting, sensing, and catalysis. Conventionally, plasmons are found in bulk and nanomaterials and can be described with classical electrodynamics. In recent years, plasmons have also been identified in molecules, and these molecules have been utilized to build plasmonic devices. As molecular plasmons can no longer be described by classical electrodynamics, a description using quantum mechanics is necessary. In this Letter, we develop a quantum metric to accurately and efficiently identify and quantify plasmons in molecules. A number, which we call the plasmon character index (PCI), can be calculated for each electronic excited state and describes the plasmonicity of the excitation. PCI is developed from the collective and coherent excitation picture in orbitals and shows excellent agreement with the predictions from scaled time-dependent density functional theory but is vastly more computationally efficient. Therefore, PCI can be a useful tool in identifying and quantifying plasmons and will inform the rational design of plasmonic molecules and nanoclusters.This publication has 56 references indexed in Scilit:
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