sp-d Exchange Interactions in Wave Function Engineered Colloidal CdSe/Mn:CdS Hetero-Nanoplatelets

Nano Letters
Franziska MuckelGerd Bacher

Abstract

In two-dimensional (2D) colloidal semiconductor nanoplatelets, which are atomically flat nanocrystals, the precise control of thickness and composition on the atomic scale allows for the synthesis of heterostructures with well-defined electron and hole wave function distributions. Introducing transition metal dopants with a monolayer precision enables tailored magnetic exchange interactions between dopants and band states. Here, we use the absorption based technique of magnetic circular dichroism (MCD) to directly prove the exchange coupling of magnetic dopants with the band charge carriers in hetero-nanoplatelets with CdSe core and manganese-doped CdS shell (CdSe/Mn:CdS). We show that the strength of both the electron as well as the hole exchange interactions with the dopants can be tuned by varying the nanoplatelets architecture with monolayer accuracy. As MCD is highly sensitive for excitonic resonances, excited level spectroscopy allows us to resolve and identify, in combination with wave function calculations, several excited state transitions including spin-orbit split-off excitonic contributions. Thus, our study not only demonstrates the possibility to expand the extraordinary physical properties of colloidal nanoplatele...Continue Reading

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Citations

Oct 3, 2019·The Journal of Chemical Physics·David ParobekDong Hee Son
Dec 16, 2019·The Journal of Chemical Physics·Rachel FainblatGerd Bacher
Jan 3, 2020·The Journal of Chemical Physics·Jung Ho YuJiwoong Yang
Oct 29, 2020·Nanoscale·Danil O TolmachevManfred Bayer
Mar 17, 2021·The Journal of Physical Chemistry Letters·Arman NajafiAthos Petrou
Dec 1, 2020·Journal of the American Chemical Society·Chi LiYi-Hsin Liu

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