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May 1, 2020

ACS Spring 2020 National Meeting & Expo

Ultrafast investigation of electronic and vibrational dynamics of via pump-degenerate four-wave mixing

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Abstract

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Abstract

Phonon dynamics and their coupling to electronic excitations in bulk tungsten disulfide is investigated. Pump-degenerate four-wave mixing is used to measure the femtosecond dynamics of the phonons, which when combined with transient absorption spectroscopy, provides an energy-resolved picture of phonon dynamics and their lifetimes. Measurements suggest the LA(M) phonon mitigates electron scattering from the K point to the Σ valley in under 100 fs. Pump-degenerate four-wave mixing is hereby shown to be an effective tool to compliment momentum-resolved methods for studying coupling in tungsten disulfide and other transition metal dichalcogenides.

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© Copyright 2019 Morressier GmbH.
All rights reserved.