Regensburg 2022 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 39: Quantum Dots and Wires 6: II-VI and related
HL 39.4: Talk
Friday, September 9, 2022, 10:15–10:30, H32
Polarized emission with sub-meV linewidth from single, two-dimensional PbS nanoplatelets — •Pengji Li1, Lars Klepzig2,3, Jingzhong Yang1, Michael Zopf1, Jannika Lauth2,3,4, and Fei Ding1 — 1Institut für Festkörperphysik, Leibniz Universität Hannover, 30167 Hannover, Germany — 2Institute of Physical Chemistry and Electrochemistry, Leibniz Universität Hannover, 30167 Hannover, Germany — 3Cluster of Excellence PhoenixD, Welfengarten 1A, D-30167 Hannover, Germany — 4Universität Tübingen, Institute of Physical and Theoretical Chemistry, Auf der Morgenstelle 18, D-72076 Tübingen, Germany
In the past few decades, the tunability and strong light-matter coupling in nanometer-sized colloidal systems promotes their potential use in novel applications such as quantum metrology, quantum imaging or quantum communication. Two-dimensional (2D) nanoplatelets (NPLs) have recently moved into focus due to their controllable photoluminescence properties. In this work, the optical properties of single colloidal 2D PbS NPLs are explored at cryogenic temperature (T=4 K). Stable and narrow-band excitonic emission of single PbS NPL near 1.8 eV is observed with linewidths down to 0.6 meV.The prominent exciton-phonon interaction are detected. The emission features a strongly polarized emission with a degree of polarization up to 77%. These findings denote the first observation of narrow-band polarized photoluminescence (PL) from 2D PbS nanoplatelets, which were believed to suffer from broad PL due to complex band-edge exciton states evolving from the 64-fold degeneracy in PbS.