Nuclear spin dynamics influenced and detected by electron spin polarization in CdTe/CdMgTe quantum wells

Abstract

Nuclear spin coherence and relaxation dynamics of all constituent isotopes of an n-doped CdTe/(Cd,Mg)Te quantum well structure are studied employing optically detected nuclear magnetic resonance. Using time-resolved pump-probe Faraday ellipticity, we generate and detect the coherent spin dynamics of the resident electrons. The photogenerated electron spin polarization is transferred into the nuclear spin system, which becomes polarized and acts back on the electron spins as the Overhauser field. Under the influence of resonant radio frequency pulses, we trace the coherent spin dynamics of the nuclear isotopes ${}^{111}$Cd, ${}^{113}$Cd, and ${}^{125}$Te. We measure nuclear Rabi oscillations, the inhomogeneous dephasing time $T_2^{\ast }$, the spin coherence time $T_2$, and the longitudinal relaxation time $T_1$. Furthermore, we investigate the influence of the laser excitation and the corresponding electron spin polarization on the nuclear spin relaxation time and find a weak extension of this time induced by interaction with the electron spins.

arXiv comment5 pages, 2 figures

References in corpus (12)

• Nuclear spin physics in quantum dots: an optical investigation
• Electron Spin Dephasing due to Hyperfine Interactions with a Nuclear Spin Bath
• Dynamics of Quantum Dot Nuclear Spin Polarization Controlled by a Single Electron
• Pump-Probe Faraday Rotation and Ellipticity in an Ensemble of Singly Charged Quantum Dots
• Spin coherence of a two-dimensional electron gas induced by resonant excitation of trions and excitons in CdTe/(Cd,Mg)Te quantum wells
• Quadrupolar induced suppression of nuclear spin bath fluctuations in self-assembled quantum dots
• Spin Inertia of Resident and Photoexcited Carriers in Singly-Charged Quantum Dots
• Time-resolved and continuous-wave optical spin pumping of semiconductor quantum wells
• All-optical NMR in semiconductors provided by resonant cooling of nuclear spins interacting with electrons in the resonant spin amplification regime
• High-field optically detected nuclear magnetic resonance in GaAs
• Dynamics of nuclear spin polarization induced and detected by coherently precessing electron spins in fluorine-doped ZnSe
• Inhomogeneous nuclear spin polarization induced by helicity-modulated optical excitation of fluorine-bound electron spins in ZnSe