Direct Visualization of Confinement and Many-Body Correlation Effects in 2D Spectroscopy of Quantum Dots
Amarotti, Edoardo LU ; Wang, Zhengjun LU ; Hedse, Albin LU ; Lenngren, Nils LU ; Žídek, Karel LU ; Zheng, Kaibo LU ; Zigmantas, Donatas LU
and Pullerits, Tõnu
LU
(2024)
In Advanced Optical Materials
12(15).
- Abstract
The size tunable color of colloidal semiconductor quantum dots (QDs) is probably the most elegant illustration of the quantum confinement effect. As explained by the simple “particle-in-a-box” model, the transition energies between the levels increase when the “box” becomes smaller. To investigate quantum confinement effects, typically a well-defined narrow size distribution of the nanoparticles is needed. In this contribution, how coherent electronic two-dimensional spectroscopy (2DES) can directly visualize the quantum size effect in a sample with broad size distribution of QDs is demonstrated. The method is based on two features of the 2DES – the ability to resolve inhomogeneous broadening and the capability to reveal correlations... (More)
The size tunable color of colloidal semiconductor quantum dots (QDs) is probably the most elegant illustration of the quantum confinement effect. As explained by the simple “particle-in-a-box” model, the transition energies between the levels increase when the “box” becomes smaller. To investigate quantum confinement effects, typically a well-defined narrow size distribution of the nanoparticles is needed. In this contribution, how coherent electronic two-dimensional spectroscopy (2DES) can directly visualize the quantum size effect in a sample with broad size distribution of QDs is demonstrated. The method is based on two features of the 2DES – the ability to resolve inhomogeneous broadening and the capability to reveal correlations between the states. In QD samples, inhomogeneous spectral broadening is mainly caused by the size distribution and leads to elongated diagonal peaks of the spectra. Since the cross peaks correlate the energies of two states, they allow drawing conclusions about the size dependence of the corresponding states. It is also found that the biexciton binding energy changes between 3 and 8 meV with the QD size. Remarkably, the size dependence is non-monotonic with a clear minimum.
(Less)
- author
- Amarotti, Edoardo
LU
; Wang, Zhengjun
LU
; Hedse, Albin
LU
; Lenngren, Nils
LU
; Žídek, Karel
LU
; Zheng, Kaibo
LU
; Zigmantas, Donatas
LU
and Pullerits, Tõnu
LU
- organization
- publishing date
- 2024
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- 2D electronic spectroscopy, biexciton, binding energy, quantum dots, size dependence, ultrafast spectroscopy
- in
- Advanced Optical Materials
- volume
- 12
- issue
- 15
- publisher
- John Wiley & Sons Inc.
- external identifiers
-
- scopus:85185452876
- ISSN
- 2195-1071
- DOI
- 10.1002/adom.202302968
- language
- English
- LU publication?
- yes
- id
- d7130e56-2006-47e3-94dc-21048d13b9be
- date added to LUP
- 2024-03-20 13:50:15
- date last changed
- 2024-10-14 12:01:32
@article{d7130e56-2006-47e3-94dc-21048d13b9be,
abstract = {{<p>The size tunable color of colloidal semiconductor quantum dots (QDs) is probably the most elegant illustration of the quantum confinement effect. As explained by the simple “particle-in-a-box” model, the transition energies between the levels increase when the “box” becomes smaller. To investigate quantum confinement effects, typically a well-defined narrow size distribution of the nanoparticles is needed. In this contribution, how coherent electronic two-dimensional spectroscopy (2DES) can directly visualize the quantum size effect in a sample with broad size distribution of QDs is demonstrated. The method is based on two features of the 2DES – the ability to resolve inhomogeneous broadening and the capability to reveal correlations between the states. In QD samples, inhomogeneous spectral broadening is mainly caused by the size distribution and leads to elongated diagonal peaks of the spectra. Since the cross peaks correlate the energies of two states, they allow drawing conclusions about the size dependence of the corresponding states. It is also found that the biexciton binding energy changes between 3 and 8 meV with the QD size. Remarkably, the size dependence is non-monotonic with a clear minimum.</p>}},
author = {{Amarotti, Edoardo and Wang, Zhengjun and Hedse, Albin and Lenngren, Nils and Žídek, Karel and Zheng, Kaibo and Zigmantas, Donatas and Pullerits, Tõnu}},
issn = {{2195-1071}},
keywords = {{2D electronic spectroscopy; biexciton; binding energy; quantum dots; size dependence; ultrafast spectroscopy}},
language = {{eng}},
number = {{15}},
publisher = {{John Wiley & Sons Inc.}},
series = {{Advanced Optical Materials}},
title = {{Direct Visualization of Confinement and Many-Body Correlation Effects in 2D Spectroscopy of Quantum Dots}},
url = {{http://dx.doi.org/10.1002/adom.202302968}},
doi = {{10.1002/adom.202302968}},
volume = {{12}},
year = {{2024}},
}