Beating signals in CdSe quantum dots measured by low-temperature 2D spectroscopy

Zhengjun Wang; Albin Hedse; Edoardo Amarotti; Nils Lenngren; Karel Źídek; Kaibo Zheng; Donatas Zigmantas; Tõnu Pullerits

doi:10.1063/5.0089798

Beating signals in CdSe quantum dots measured by low-temperature 2D spectroscopy

Zhengjun Wang, Albin Hedse, Edoardo Amarotti, Nils Lenngren, Karel Źídek, Kaibo Zheng, Donatas Zigmantas, Tõnu Pullerits^*

^*Corresponding author for this work

Department of Chemistry

Lund University

Research output: Contribution to journal › Journal article › Research › peer-review

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Abstract

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.

Original language	English
Article number	014201
Journal	Journal of Chemical Physics
Volume	157
Issue number	1
Number of pages	7
ISSN	0021-9606
DOIs	https://doi.org/10.1063/5.0089798
Publication status	Published - 2022

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title = "Beating signals in CdSe quantum dots measured by low-temperature 2D spectroscopy",

abstract = "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.",

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AU - Wang, Zhengjun

AU - Hedse, Albin

AU - Amarotti, Edoardo

AU - Lenngren, Nils

AU - Źídek, Karel

AU - Zheng, Kaibo

AU - Zigmantas, Donatas

AU - Pullerits, Tõnu

PY - 2022

Y1 - 2022

N2 - 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.

AB - 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.

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DO - 10.1063/5.0089798

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JO - Journal of Chemical Physics

JF - Journal of Chemical Physics

IS - 1

M1 - 014201

ER -

Beating signals in CdSe quantum dots measured by low-temperature 2D spectroscopy

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