Single and double electron spin-flip Raman scattering in CdSe colloidal nanoplatelets

Abstract

CdSe colloidal nanoplatelets are studied by spin-flip Raman scattering in magnetic fields up to 5 T. We find pronounced Raman lines shifted from the excitation laser energy by an electron Zeeman splitting. Their polarization selection rules correspond to those expected for scattering mediated by excitons interacting with resident electrons. Surprisingly, Raman signals shifted by twice the electron Zeeman splitting are also observed. The theoretical analysis and experimental dependencies show that the mechanism responsible for the double flip involves two resident electrons interacting with a photoexcited exciton. Effects related to various orientations of the nanoplatelets in the ensemble and different orientations of the magnetic field are analyzed.

References in corpus (6)

• Spin dynamics in semiconductor nanocrystals
• Universal behavior of the electron g-factor in GaAs/AlGaAs quantum wells
• Addressing the exciton fine structure in colloidal nanocrystals: the case of CdSe nanoplatelets
• Electron and hole g-factors and spin dynamics of negatively charged excitons in CdSe/CdS colloidal nanoplatelets with thick shells
• Spin-flip Raman scattering of the $\Gamma$-X mixed exciton in indirect band-gap (In,Al)As/AlAs quantum dots
• Spin-flip Raman scattering of the neutral and charged excitons confined in a CdTe/(Cd,Mg)Te quantum well

Cited by in corpus (7)

• Surface spin magnetism controls the polarized exciton emission from CdSe nanoplatelets
• Magneto-optics of excitons interacting with magnetic ions in CdSe/CdMnS colloidal nanoplatelets
• Theory of single and double electron spin-flip Raman scattering in semiconductor nanoplatelets
• Optical Resonance Shift Spin Noise Spectroscopy
• Theory of resonant Raman scattering due to spin-flips of resident charge carries and excitons in perovskite semiconductors
• Bright-Dark Exciton Interplay Evidenced by Spin Polarization in CdSe/CdMnS Nanoplatelets
• Electron, hole and exciton effective g-factors in semiconductor nanocrystals