Spin dynamics and level structure of quantum-dot quantum wells

Abstract

We have characterized CdS/CdSe/CdS quantum-dot quantum wells using time-resolved Faraday rotation (TRFR). The spin dynamics show that the electron g-factor varies as a function of quantum well width and the transverse spin lifetime of several nano-seconds is robust up to room temperature. As a function of probe energy, the amplitude of the TRFR signal shows pronounced resonances, which allow one to identify individual exciton transitions. While the TRFR data are inconsistent with the conduction and valence band level scheme of spherical quantum-dot quantum wells, a model in which broken spherical symmetry is taken into account captures the essential features.

5 pages, 3 figures

References in corpus (7)

• Spin dynamics in semiconductor nanocrystals
• Development of an eight-band theory for quantum-dot heterostructures
• Multiband theory of quantum-dot quantum wells: Dark excitons, bright excitons, and charge separation in heteronanostructures
• Effect of the Surface on the Electron Quantum Size Levels and Electron g-Factor in Spherical Semiconductor Nanocrystals
• Molecular spintronics: Coherent spin transfer in coupled quantum dots
• Magneto-optical response of CdSe nanostructures
• Tight-binding g-Factor Calculations of CdSe Nanostructures

Cited by in corpus (7)

• Electron and hole g-factors and spin dynamics of negatively charged excitons in CdSe/CdS colloidal nanoplatelets with thick shells
• Spin dynamics in electrochemically charged CdSe quantum dots
• Dynamics of Coupled Qubits Interacting with an Off-Resonant Cavity
• Faraday Rotation Spectroscopy of Quantum-Dot Quantum Wells
• Near-threshold properties of the electronic density of layered quantum-dots
• Polarization transitions in Quantum Dot Quantum Well Arrays
• Electron, hole and exciton effective g-factors in semiconductor nanocrystals