Electrically tunable g-factors in quantum dot molecular spin states

Abstract

We present a magneto-photoluminescence study of individual vertically stacked InAs/GaAs quantum dot pairs separated by thin tunnel barriers. As an applied electric field tunes the relative energies of the two dots, we observe a strong resonant increase or decrease in the g-factors of different spin states that have molecular wavefunctions distributed over both quantum dots. We propose a phenomenological model for the change in g-factor based on resonant changes in the amplitude of the wavefunction in the barrier due to the formation of bonding and antibonding orbitals.

5 pages, 5 figures, Accepted by Phys. Rev. Lett. New version reflects response to referee comments

References in corpus (8)

• Quantum Computation with Quantum Dots
• Electron Spin Resonance Transistors for Quantum Computing in Silicon-Germanium Heterostructures
• Control and Detection of Singlet-Triplet Mixing in a Random Nuclear Field
• Direct Observation of Controlled Coupling in an Individual Quantum Dot Molecule
• Electron g-factor Engineering in III-V Semiconductors for Quantum Communications
• Optically Probing Spin and Charge Interactions in an Tunable Artificial Molecule
• Gate-Controlled Electron Spin Resonance in a GaAs/AlGaAs Heterostructure
• Spin transfer and coherence in coupled quantum wells

Cited by in corpus (35)

• Spin dynamics in semiconductors
• Optical control of one and two hole spins in interacting quantum dots
• Recent progresses of quantum confinement in graphene quantum dots
• Spin Fine Structure in Optically Excited Quantum Dot Molecules
• Scalable qubit architecture based on holes in quantum dot molecules
• Hole Spin Mixing in InAs Quantum Dot Molecules
• Exciton-spin memory with a semiconductor quantum dot molecule
• Voltage tunability of single spin-states in a quantum dot
• Method for Full Bloch-Sphere Control of a Localized Spin via a Single Electrical Gate
• Electrically-tunable hole g-factor of an optically-active quantum dot for fast spin rotations
• Size dependent exciton g-factor in self-assembled InAs/InP quantum dots
• Strong electrically tunable exciton g-factors in an individual quantum dots due to hole orbital angular momentum quenching
• Relativistic Artificial Molecules Realized by Two Coupled Graphene Quantum Dots
• Highly Non-linear Excitonic Zeeman Spin-Splitting in Composition-Engineered Artificial Atoms
• Strong Electron-Hole Exchange in Coherently Coupled Quantum Dots
• Fine structure and optical pumping of spins in individual semiconductor quantum dots
• Electric g Tensor Control and Spin Echo of a Hole-Spin Qubit in a Quantum Dot Molecule
• Gate control of a quantum dot single-electron spin in realistic confining potentials: anisotropy effects
• Exciton spectra in vertical stacks of triple and quadruple quantum dots in an electric field
• Spectroscopic signatures of many-body interactions and delocalized states in self-assembled lateral quantum dot molecules
• Coulomb interaction signatures in self-assembled lateral quantum dot molecules
• Probing the dark exciton states of a single quantum dot using photocurrent spectroscopy in magnetic fields
• Electrical control of spins and giant g-factors in ring-like coupled quantum dots
• Spin-dependent tunneling into an empty lateral quantum dot
• Optical measurement and modeling of interactions between two hole or two electron spins in coupled InAs quantum dots
• Symmetry induced hole-spin mixing in quantum dot molecules
• Controlled Coherent Coupling in a Quantum Dot Molecule Revealed by Ultrafast Four-Wave Mixing Spectroscopy
• Single-particle and collective excitations in quantum wires made up of vertically stacked quantum dots: Zero magnetic field
• Incorporation of random alloy GaBi${}_x$As${}_{1-x}$ barriers in InAs quantum dot molecules (I): energy levels and confined hole states
• Magnetic control of dipolaritons in quantum dots
• The impact of hole $g$-factor anisotropy on spin-photon entanglement generation with InGaAs quantum dots
• Charging of a Single InAs QD with Electrically-Injected Holes using a Lateral Electric Field
• Time-domain anyon interferometry in Kitaev honeycomb spin liquids and beyond
• Antibonding ground states in semiconductor artificial molecules
• Optical Spin Initialization and Non-Destructive Measurement in a Quantum Dot Molecule