Long-lived electron spin coherence in CdSe/ZnSSe self-assembled quantum dots

Abstract

The electron spin coherence in n-doped and undoped, self-assembled CdSe/Zn(S,Se) quantum dots has been studied by time-resolved pump-probe Kerr rotation. Long-lived spin coherence persisting up to 13 ns after spin orientation has been found in the n-doped quantum dots, outlasting significantly the lifetimes of charge neutral and negatively charged excitons of 350 - 530 ps. The electron spin dephasing time as long as 5.6 ns has been measured in a magnetic field of 0.25 T. Hyperfine interaction of resident electrons with a nuclear spin fluctuations is suggested as the main limiting factor for the dephasing time. The efficiency of this mechanism in II-VI and III-V quantum dots is analyzed.

9 pages, 7 figures, 1 table

References in corpus (5)

• Optical control of spin coherence in singly charged (In,Ga)As/GaAs quantum dots
• Universal behavior of the electron g-factor in GaAs/AlGaAs quantum wells
• Optical Read-Out and Initialization of an Electron Spin in a Single Quantum Dot
• Spin dynamics in electrochemically charged CdSe quantum dots
• Temperature induced spin coherence dissipation in quantum dots

Cited by in corpus (13)

• Coherent Spin Precession and Lifetime-Limited Spin Dephasing in CsPbBr3 Perovskite Nanocrystals
• Coherent spin dynamics of electrons and holes in semiconductor quantum wells and quantum dots under periodical optical excitation: resonant spin amplification versus spin mode-locking
• Longitudinal spin-relaxation of donor-bound electrons in direct bandgap semiconductors
• Origin of Two Larmor Frequencies in the Coherent Spin Dynamics of Colloidal CdSe Quantum Dots Revealed by Controlled Charging
• All-optical NMR in semiconductors provided by resonant cooling of nuclear spins interacting with electrons in the resonant spin amplification regime
• Ground state of the holes localized in II-VI quantum dots with Gaussian potential profiles
• Dominant role of the shear strain induced admixture in spin-flip processes in self-assembled quantum dots
• Limited accuracy of conduction band effective mass equations for semiconductor quantum dots
• Microscopic dynamics of electron hopping in a semiconductor quantum well probed by spin-dependent photon echoes
• Inhomogeneous nuclear spin polarization induced by helicity-modulated optical excitation of fluorine-bound electron spins in ZnSe
• Comparison of magneto-optical properties of various excitonic complexes in CdTe and CdSe self-assembled quantum dots
• Optical initialization of hole spins in p-doped quantum dots: orientation efficiency and loss of coherence
• Self-Quenching of Nuclear Spin Dynamics in Central Spin Problem