Spin properties of single electron states in coupled quantum dots

Abstract

Spin properties of single electron states in laterally coupled quantum dots in the presence of a perpendicular magnetic field are studied by exact numerical diagonalization. Dresselhaus (linear and cubic) and Bychkov-Rashba spin-orbit couplings are included in a realistic model of confined dots based on GaAs. Group theoretical classification of quantum states with and without spin orbit coupling is provided. Spin-orbit effects on the g-factor are rather weak. It is shown that the frequency of coherent oscillations (tunneling amplitude) in coupled dots is largely unaffected by spin-orbit effects due to symmetry requirements. The leading contributions to the frequency involves the cubic term of the Dresselhaus coupling. Spin-orbit coupling in the presence of magnetic field leads to a spin-dependent tunneling amplitude, and thus to the possibility of spin to charge conversion, namely spatial separation of spin by coherent oscillations in a uniform magnetic field. It is also shown that spin hot spots exist in coupled GaAs dots already at moderate magnetic fields, and that spin hot spots at zero magnetic field are due to the cubic Dresselhaus term only.

16 pages, 12 figures

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Cited by in corpus (58)

• Spins in few-electron quantum dots
• Semiconductor Spintronics
• Semiconductor Spin Qubits
• Decoherence in Solid State Qubits
• Strong coupling of a spin qubit to a superconducting stripline cavity
• Singlet and triplet Cooper pair splitting in hybrid superconducting nanowires
• Coherent spin qubit transport in silicon
• Theory of phonon-induced spin relaxation in laterally coupled quantum dots
• Orbital and spin relaxation in single and coupled quantum dots
• Hyperfine-phonon spin relaxation in a single-electron GaAs quantum dot
• Theory of anisotropic exchange in laterally coupled quantum dots
• Spin shuttling in a silicon double quantum dot
• Giant anisotropy of spin relaxation and spin-valley mixing in a silicon quantum dot
• Anisotropy and suppression of spin--orbit interaction in a GaAs double quantum dot
• Phonon-Mediated Decay of Singlet-Triplet Qubits in Double Quantum Dots
• Simultaneous Spin-Charge Relaxation in Double Quantum Dots
• Theory of Single Electron Spin Relaxation in Si/SiGe Lateral Coupled Quantum Dots
• Spin-orbit coupling and anisotropic exchange in two-electron double quantum dots
• Elastic Spin Relaxation Processes in Semiconductor Quantum Dots
• Decoherence of a Driven Qubit
• Effect of electron-electron interaction on the phonon-mediated spin relaxation in quantum dots
• Spin entanglement induced by spin-orbit interactions in coupled quantum dots
• Theory of Spin Relaxation in Two-Electron Lateral Coupled Si/SiGe Quantum Dots
• Fast Long-Distance Control of Spin Qubits by Photon Assisted Cotunneling
• Excitons in quantum dot molecules: Coulomb coupling, spin-orbit effects and phonon-induced line broadening
• Transporting a single-spin qubit through a double quantum dot
• Control of electron spin and orbital resonance in quantum dots through spin-orbit interactions
• Orbital effects of a strong in-plane magnetic field on a gate-defined quantum dot
• Spin-orbit coupling and electric-dipole spin resonance in a nanowire double quantum dot
• Spin Manipulation and Relaxation in Spin-Orbit Qubits
• G-factor of electrons in gate-defined quantum dots in a strong in-plane magnetic field
• Control of spin relaxation in semiconductor double quantum dots
• Phonon-assisted relaxation and decoherence of singlet-triplet qubits in Si/SiGe quantum dots
• Non-monotonic spin relaxation and decoherence in graphene quantum dots with spin-orbit interactions
• Pulse-pumped double quantum dot with spin-orbit coupling
• Gate-defined coupled quantum dots in topological insulators
• Nonlinear Spin-Charge Dynamics in a Driven Double Quantum Dot
• Electrical control of a spin qubit in InSb nanowire quantum dots: strongly suppressed spin relaxation in high magnetic field
• Control of a spin qubit in a lateral GaAs quantum dot based on symmetry of gating potential
• The influence of anisotropic gate potentials on the phonon induced spin-flip rate in GaAs quantum dots
• Characteristic molecular properties of one-electron double quantum rings under magnetic fields
• Generation of spin-dependent coherent states in a quantum wire
• Significance of an external magnetic field on two-phonon processes in gated lateral semiconductor quantum dots
• Spin Hot Spots in vertically-coupled Few-electron Quantum Dots
• Electrical control of spin relaxation time in complex quantum nanostructures
• All-Optical Generation and Tuning of Ultrafast Spin-Hall Current via Optical Vortices
• Coupling of bonding and antibonding electron orbitals in double quantum dots by spin-orbit interaction
• Charge noise induced spin dephasing in a nanowire double quantum dot with spin-orbit coupling
• Electric control of tunneling energy in graphene double dots
• Spin dynamics in tunneling decay of a metastable state
• Quantitative modeling of spin relaxation in quantum dots
• Energy spectra of three electrons in SiGe/Si/SiGe laterally coupled triple quantum dots
• Robust entangling gate for capacitively coupled few-electron singlet-triplet qubits
• Scalable Parity Architecture With a Shuttling-Based Spin Qubit Processor
• Proposal for a cavity-induced measurement of the exchange coupling in quantum dots
• Spin Hot Spots in Single-Electron GaAs-based Quantum Dots
• Confinement sensitivity in quantum dot singlet-triplet relaxation
• Comparison of methods for computing the exchange energy in laterally coupled quantum dots