4.8 Article

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

Journal

NANO LETTERS
Volume 18, Issue 3, Pages 2047-2053

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.8b00060

Keywords

Colloidal nanoplatelets; colloidal heterostructures; semiconductor nanocrystals; wave function engineering; transition metal doping; diluted magnetic semiconductor (DMS)

Funding

  1. German Research Foundation DFG [BA-1422]
  2. National Research Foundation, Prime Minister's Office, Singapore [NRF-NRFI2016-08]

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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 nanoplatelets toward magneto-optical functionality by transition metal doping but also provides an insight into the excited state electronic structure in this novel two-dimensional material.

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