Phonon-induced electron relaxation in weakly-confined single and coupled quantum dots

Abstract

We investigate charge relaxation rates due to acoustic phonons in weakly-confined quantum dot systems, including both deformation potential and piezoelectric field interactions. Single-electron excited states lifetimes are calculated for single and coupled quantum dot structures, both in homonuclear and heteronuclear devices. Piezoelectric field scattering is shown to be the dominant relaxation mechanism in many experimentally relevant situations. On the other hand, we show that appropriate structure design allows to minimize separately deformation potential and piezolectric field interactions, and may bring electron lifetimes in the range of microseconds.

20 pages (preprint format), 7 figures, submitted to Physical Review B

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• Phonon-assisted relaxation between hole states in quantum dot molecules
• Energy relaxation in hot electron quantum optics via acoustic and optical phonon emission
• Spin-orbit induced hole spin relaxation in InAs and GaAs quantum dots
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• Electron-acoustic-phonon scattering and electron relaxation in two-coupled quantum rings
• Effect of the Coulomb interaction on the electron relaxation of weakly-confined quantum dot systems
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• Tunneling-related electron spin relaxation in self-assembled quantum-dot molecules
• Mitigating decoherence in hot electron interferometry
• Quantitative modeling of spin relaxation in quantum dots
• Spontaneous and resonant lifting of the spin blockade in nanowire quantum dots
• Anisotropy of spin-orbit induced electron spin relaxation in [001] and [111] grown GaAs quantum dots
• Estimation of the spatial decoherence time in circular quantum dots
• Spectral broadening of optical transitions at tunneling resonances in InAs/GaAs coupled quantum dot pairs
• Controlling dephasing of coupled qubits via shared-bath coherence
• Spin Hot Spots in Single-Electron GaAs-based Quantum Dots
• Confinement sensitivity in quantum dot singlet-triplet relaxation
• Non-stationary effects in the coupled quantum dots influenced by the electron-phonon interaction