Dominant role of the shear strain induced admixture in spin-flip processes in self-assembled quantum dots

Abstract

We study theoretically the spin-flip relaxation processes for a single electron in a self-assembled InAs/GaAs quantum dot, using an 8-band kp theory in the envelope function approximation. We show that the dominating channel of spin relaxation is spin admixture induced by symmetry-breaking shear strain, which can be mapped onto two effective spin-phonon terms in a conduction band (effective mass) Hamiltonian that have a similar structure and interfere constructively. Unlike the Dresselhaus coupling that dominates spin relaxation in larger, unstrained dots, the shear strain contribution cannot be modeled by a unique standard term in the Hamiltonian but rather relies on the actual strain distribution in the quantum dot.

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Cited by in corpus (13)

• Hyperfine interaction for holes in quantum dots: k.p model
• Impact of MBE-grown (In,Ga)As/GaAs metamorphic buffers on excitonic and optical properties of single quantum dots with single-photon emission tuned to the telecom range
• Ferroelastic switching with van der Waals direction transformation in layered PdSe2 driven by uniaxial and shear strain
• Hole spin-flip transitions in a self-assembled quantum dot
• Controllable electron spin dephasing due to phonon state distinguishability in a coupled quantum dot system
• Tunneling-related electron spin relaxation in self-assembled quantum-dot molecules
• The importance of second order deformation potentials in modeling of InAs/GaAs nanostructures
• Strongly temperature-dependent recombination kinetics of a negatively charged exciton in asymmetric quantum dots at 1.55 μm
• Spin-orbit coupling and spin relaxation of hole states in [001]- and [111]-orientedquantum dots of various geometry
• Phonon-assisted carrier tunneling in coupled quantum dot systems with hyperfine-induced spin flip
• Quantum dots as optimized chiral emitters for photonic integrated circuits
• Spin-orbit-induced hole spin relaxation in a quantum dot molecule: the effect of $s$-$p$ coupling
• Distributed Bragg reflector-mediated excitation of InAs/InP quantum dots emitting in the telecom C-band