Advances in ultrafast spectroscopy can provide access to dynamics involving nontrivial quantum correlations and their evolutions. In coherent 2D spectroscopy, the oscillatory time dependence of a signal is a signature of such quantum dynamics. Here, we study such beating signals in electronic coherent 2D spectroscopy of CdSe quantum dots (CdSe QDs) at 77 K. The beating signals are analyzed in terms of their positive and negative Fourier components. We conclude that the beatings originate from coherent LO-phonons of CdSe QDs. No evidence for the QD size dependence of the LO-phonon frequency was identified.
Beating signals in CdSe quantum dots measured by low-temperature 2D spectroscopy
Note: This paper is part of the JCP Special Topic on Time-Resolved Vibrational Spectroscopy.
Zhengjun Wang, Albin Hedse, Edoardo Amarotti, Nils Lenngren, Karel Žídek, Kaibo Zheng, Donatas Zigmantas, Tõnu Pullerits; Beating signals in CdSe quantum dots measured by low-temperature 2D spectroscopy. J. Chem. Phys. 7 July 2022; 157 (1): 014201. https://doi.org/10.1063/5.0089798
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