Coupling of bonding and antibonding electron orbitals in double quantum dots by spin-orbit interaction

Abstract

We perform a systematic exact diagonalization study of spin-orbit coupling effects for stationary few-electron states confined in quasi two-dimensional double quantum dots. We describe the spin-orbit-interaction induced coupling between bonding and antibonding orbitals and its consequences for magneto-optical absorption spectrum. The spin-orbit coupling for odd electron numbers (one, three) %only weakly perturbs the ground-state wave functions. %Nevertheless, %the spin-orbit interaction opens avoided crossings between low energy excited levels of opposite spin orientation and opposite spatial parity. For two-electrons the spin-orbit coupling allows for low-energy optical transitions that are otherwise forbidden by spin and parity selection rules. We demonstrate that the energies of optical transitions can be significantly increased by an in-plane electric field but only for odd electron numbers. Occupation of single-electron orbitals and effects of spin-orbit coupling on electron distribution between the dots are also discussed.

References in corpus (34)

• Coupled quantum dots as quantum gates
• Few-Electron Quantum Dot Circuit with Integrated Charge Read-Out
• Hilbert space structure of a solid state quantum computer: two-electron states of a double quantum dot artificial molecule
• Direct Observation of Controlled Coupling in an Individual Quantum Dot Molecule
• Single-shot readout of electron spin states in a quantum dot using spin-dependent tunnel rates
• Direct Measurement of the Spin-Orbit Interaction in a Two-Electron InAs Nanowire Quantum Dot
• Anisotropic exchange interaction of localized conduction-band electrons in semiconductor structures
• Quantum rings as electron spin beam splitters
• Spin-Orbit Mediated Control of Spin Qubits
• Experimental signature of phonon-mediated spin relaxation
• Cancellation of Spin-Orbit Effects in Quantum Gates Based on the Exchange Coupling in Quantum Dots
• Theory of phonon-induced spin relaxation in laterally coupled quantum dots
• Optically Probing Spin and Charge Interactions in an Tunable Artificial Molecule
• Energy levels and magneto-optical transitions in parabolic quantum dots with spin-orbit coupling
• Two-electron quantum dot molecule: Composite particles and the spin phase diagram
• Optical Signatures of Spin-Orbit Interaction Effects in a Parabolic Quantum Dot
• Spin properties of single electron states in coupled quantum dots
• Anisotropic Spin Exchange in Pulsed Quantum Gates
• Universal Quantum Computation through Control of Spin-Orbit Coupling
• Spin relaxation at the singlet-triplet crossing in a quantum dot
• Networks of quantum nanorings: programmable spintronic devices
• Spin state mixing in InAs double quantum dots
• Semiclassical Monte Carlo Model for In-Plane Transport of Spin-Polarized Electrons in III-V Heterostructures
• Spin-orbit-driven coherent oscillations in a few-electron quantum dot
• Theory of anisotropic exchange in laterally coupled quantum dots
• Universal Quantum Logic from Zeeman and Anisotropic Exchange Interactions
• Triplet-Singlet Spin Relaxation in Quantum Dots with Spin-Orbit Coupling
• Spin rotations induced by electron running on closed trajectories in gated semiconductor nanodevices
• Few-electron artificial molecules formed by laterally coupled quantum rings
• Failure of standard approximations of the exchange coupling in nanostructures
• Spin-orbit mediated anisotropic spin interaction in interacting electron systems
• Triplet-singlet relaxation in semiconductor single and double quantum dots
• Reliability of the Heitler-London approach for the exchange coupling between electrons in semiconductor nanostructures
• Electronic Structure of Multiple Dots

Cited by in corpus (5)

• Spin dynamics in a strongly driven system: very slow Rabi oscillations
• Tuning of the spin-orbit interaction in a quantum dot by an in-plane magnetic field
• Electrical control of phonon mediated spin relaxation rate in semiconductor quantum dots: the Rashba vs the Dresselhaus spin-orbit couplings
• Singlet-triplet avoided crossings and effective $g$ factor versus spatial orientation of spin-orbit-coupled quantum dots
• Time dependent configuration interaction simulations of spin swap in spin orbit coupled double quantum dots