Effect of electron-electron interaction on the phonon-mediated spin relaxation in quantum dots
arXiv:0704.0868 · doi:10.1103/PhysRevB.76.085305
Abstract
We estimate the spin relaxation rate due to spin-orbit coupling and acoustic phonon scattering in weakly-confined quantum dots with up to five interacting electrons. The Full Configuration Interaction approach is used to account for the inter-electron repulsion, and Rashba and Dresselhaus spin-orbit couplings are exactly diagonalized. We show that electron-electron interaction strongly affects spin-orbit admixture in the sample. Consequently, relaxation rates strongly depend on the number of carriers confined in the dot. We identify the mechanisms which may lead to improved spin stability in few electron (>2) quantum dots as compared to the usual one and two electron devices. Finally, we discuss recent experiments on triplet-singlet transitions in GaAs dots subject to external magnetic fields. Our simulations are in good agreement with the experimental findings, and support the interpretation of the observed spin relaxation as being due to spin-orbit coupling assisted by acoustic phonon emission.
12 pages, 10 figures. Revised version. Changes in section V (simulation of PRL 98, 126601 experiment)
References in corpus (36)
- Spintronics: Fundamentals and applications
- Quantum Computation with Quantum Dots
- Single-shot read-out of an individual electron spin in a quantum dot
- Electron spin relaxation by nuclei in semiconductor quantum dots
- Triplet-Singlet Spin Relaxation via Nuclei in a Double Quantum Dot
- Spin-flip transitions between Zeeman sublevels in semiconductor quantum dots
- Phonon-induced decay of the electron spin in quantum dots
- Gate-Controlled Spin-Orbit Quantum Interference Effects in Lateral Transport
- The Addition Spectrum of a Lateral Dot from Coulomb and Spin Blockade Spectroscopy
- Zeeman energy and spin relaxation in a one-electron quantum dot
- Allowed and forbidden transitions in artificial hydrogen and helium atoms
- Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates
- Singlet-triplet decoherence due to nuclear spins in a double quantum dot
- Full configuration interaction approach to the few-electron problem in artificial atoms
- Hyperfine-mediated transitions between a Zeeman split doublet in GaAs quantum dots: The role of the internal field
- Spin relaxation and anticrossing in quantum dots: Rashba versus Dresselhaus spin-orbit coupling
- Experimental signature of phonon-mediated spin relaxation
- Interaction-Induced Enhancement of Spin-Orbit Coupling in Two-Dimensional Electronic System
- Energy levels and magneto-optical transitions in parabolic quantum dots with spin-orbit coupling
- Spin properties of single electron states in coupled quantum dots
- Spin-orbit coupling and intrinsic spin mixing in quantum dots
- Spin relaxations in semiconductor quantum dots
- Pulsed-gate measurements of the singlet-triplet relaxation time in a two-electron double quantum dot
- Orbital and spin relaxation in single and coupled quantum dots
- Geometrical spin dephasing in quantum dots
- Energy levels of a parabolically confined quantum dot in the presence of spin-orbit interaction
- Electron Correlations in a Quantum Dot with Bychkov-Rashba Coupling
- Phonon-induced electron relaxation in weakly-confined single and coupled quantum dots
- Electrical pump-and-probe study of spin singlet-triplet relaxation in a quantum dot
- Triplet-Singlet Spin Relaxation in Quantum Dots with Spin-Orbit Coupling
- Reduced electron relaxation rate in multi-electron quantum dots
- Oscillatory spin relaxation rates in quantum dots
- Spin relaxation in quantum dots with random spin-orbit coupling
- Spin Exciton in quantum dot with spin orbit coupling in high magnetic field
- Control of spin relaxation in semiconductor double quantum dots
- Effect of the Coulomb interaction on the electron relaxation of weakly-confined quantum dot systems
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- Three interacting atoms in a one-dimensional trap: A benchmark system for computational approaches
- Phonon-induced dephasing of singlet-triplet superpositions in double quantum dots without spin-orbit coupling
- Capacitively coupled double quantum dot system in the Kondo regime
- Triplet-singlet relaxation in semiconductor single and double quantum dots
- Quantum Monte Carlo study of circular quantum dots in presence of Rashba interaction
- Energy spectra of three electrons in Si/SiGe single and vertically coupled double quantum dots
- Quantitative modeling of spin relaxation in quantum dots
- Singlet-triplet relaxation induced by confined phonons in nanowire-based quantum dots
- Chiral Spin Textures of Strongly Interacting Particles in Quantum Dots
- Confinement sensitivity in quantum dot singlet-triplet relaxation
- Inducement of Spin-pairing and Correlated Semi-metallic State in Mott-Hubbard Quantum Dot Array