Spin-orbit coupling and intrinsic spin mixing in quantum dots

Abstract

Spin-orbit coupling effects are studied in quantum dots in InSb, a narrow-gap material. Competition between different Rashba and Dresselhaus terms is shown to produce wholesale changes in the spectrum. The large (and negative) $g$-factor and the Rashba field produce states where spin is no longer a good quantum number and intrinsic flips occur at moderate magnetic fields. For dots with two electrons, a singlet-triplet mixing occurs in the ground state, with observable signatures in intraband FIR absorption, and possible importance in quantum computation.

REVTEX4 text with 3 figures (high resolution figs available by request). Submitted to PRB

References in corpus (7)

• Quantum Computation with Quantum Dots
• Non-ballistic spin field-effect transistor
• Spin-flip transitions between Zeeman sublevels in semiconductor quantum dots
• Gate-Controlled Spin-Orbit Quantum Interference Effects in Lateral Transport
• Spin-orbit coupling effects on quantum transport in lateral semiconductor dots
• Spin-based quantum computation in multielectron quantum dots
• Electronic spin precession in semiconductor quantum dots with spin-orbit coupling

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• Path-integral Monte Carlo simulations for interacting few-electron quantum dots with spin-orbit coupling
• Singlet-Triplet Relaxation in Two-electron Silicon Quantum Dots
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• Electronic and spin properties of Rashba billiards
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• Spin polarization anisotropy in a narrow spin-orbit-coupled nanowire quantum dot
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• Rashba-control for the spin excitation of a fully spin polarized vertical quantum dot
• Spin-orbit enhancement in Si/SiGe heterostructures with oscillating Ge concentration
• Unique Spin Vortices in Quantum Dots with Spin-orbit Couplings
• Rashba billiards
• Renormalization of spin-orbit coupling in quantum dots due to Zeeman interaction
• Berry phase and Rashba fields in quantum rings in tilted magnetic field
• Tuning the Topological Features of Quantum-Dot Hydrogen and Helium by a Magnetic Field
• Spin-orbit Interaction induced Singlet-Triplet Resonant Raman Transitions in Quantum-dot Helium
• Spin-orbit effects on two-electron states in nanowhisker double quantum dots
• Spin Hot Spots in Single-Electron GaAs-based Quantum Dots
• Confined System with Rashba Coupling in Constant Magnetic Field
• The influence of spin-flip scattering on the preparation and detection of a single spin state in a quantum dot attached to a spin battery
• Intrinsic spin dynamics in semiconductor quantum dots
• Orbital ferromagnetism in interacting few-electron dots with strong spin-orbit coupling