Quantum confinement effects are of interest for understanding and controlling the photonic properties of metal nanosystems. The synthesis of few-atomic-layer elemental metals through confinement heteroepitaxy (CHet) offers the ability to investigate the fundamental optical and electronic properties of metals confined to two-dimensions. Polarization- and angle- resolved SHG microscopy demonstrates that these confined metals combine classical and quantum aspects, with a visible plasmon resonance and out-of-plane dipole, which enable large nonlinear optical responses. Electron dynamics were studied using ultrafast transient absorption (TA) and two-dimensional electronic spectroscopy (2DES). Femtosecond TA and 2DES results demonstrate the presence of multiple electronic relaxation steps that span the range from 100 fs to 10s of ps. Fourier analysis of periodic intensity recurrences in the time-domain 2DES signal amplitudes allowed the resolution of multiple low-frequency coherent acoustic modes spanning 10-100cm<sup>-1</sup>, which were compared to Raman scattering data.

Electron dynamics in two-dimensional metals revealed by ultrafast two-dimensional electronic spectroscopy

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.