Interplay of Bright Triplet and Dark Excitons Revealed by Magneto‐Photoluminescence of Individual PbS/CdS Quantum Dots

Kim, Younghee; Hu, Zhongjian; Avdeev, Ivan D.; Singh, Ajay; Singh, Amita; Chandrasekaran, Vigneshwaran; Nestoklon, Mikhail O.; Goupalov, Serguei V.; Hollingsworth, Jennifer A.; Htoon, Han

doi:10.1002/smll.202006977

Interplay of Bright Triplet and Dark Excitons Revealed by Magneto‐Photoluminescence of Individual PbS/CdS Quantum Dots

Journal Article · Mon Mar 08 23:00:00 EST 2021 · Small

DOI:https://doi.org/10.1002/smll.202006977· OSTI ID:1804775

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Center for Integrated Nanotechnologies Materials Physics and Applications Division Los Alamos National Laboratory Los Alamos NM 87545 USA
Ioffe Institute St. Petersburg 194021 Russia
Ioffe Institute St. Petersburg 194021 Russia, Department of Physics Jackson State University Jackson MS 39217 USA

Abstract

A low‐temperature polarization‐resolved magneto‐photoluminescence experiment is performed on individual PbS/CdS core/shell quantum dots (QDs). The experiment enables a direct measurement of the exciton Landé g factor and the anisotropic zero‐field splitting of the lowest emissive bright exciton triplet in PbS/CdS QDs. While anisotropic splittings of individual QDs distribute randomly in 104—325 μeV range, the exciton Landé g factors increase from 0.95 to 2.70 as the emission energy of the QD increases from 1.0 to 1.2 eV. The tight‐binding calculations allow to rationalize these trends as a direct consequence of reducing a cubic symmetry of QD via addition/removal of a few (<70) atoms from the surfaces of the PbS core. Furthermore, it is observed that while right ( σ ⁺ ) and left ( σ ⁻ ) circularly polarized photoluminescence (PL) peaks split linearly with magnetic field as expected for Zeeman effect, the energy splitting between X and Y linearly polarized PL peaks remains nearly unchanged. The theoretical study reveals rich and complex magnetic field‐induced interplay of bright triplet and dark exciton states explaining this puzzling behavior. These findings fill the missing gaps in the understanding of lead salt QDs and provide foundation for development of classical and quantum light sources operating at telecommunication wavelengths.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

OSTI ID:: 1804775

Journal Information:: Small, Journal Name: Small Journal Issue: 13 Vol. 17; ISSN 1613-6810

Publisher:: Wiley Blackwell (John Wiley & Sons)Copyright Statement

Country of Publication:: Germany

Language:: English

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