Hole Spin Mixing in InAs Quantum Dot Molecules

Abstract

Holes confined in single InAs quantum dots have recently emerged as a promising system for the storage or manipulation of quantum information. These holes are often assumed to have only heavy-hole character and further assumed to have no mixing between orthogonal heavy hole spin projections (in the absence of a transverse magnetic field). The same assumption has been applied to InAs quantum dot molecules formed by two stacked InAs quantum dots that are coupled by coherent tunneling of the hole between the two dots. We present experimental evidence of the existence of a hole spin mixing term obtained with magneto-photoluminescence spectroscopy on such InAs quantum dot molecules. We use a Luttinger spinor model to explain the physical origin of this hole spin mixing term: misalignment of the dots along the stacking direction breaks the angular symmetry and allows mixing through the light-hole component of the spinor. We discuss how this novel spin mixing mechanism may offer new spin manipulation opportunities that are unique to holes.

13 pages, 9 figures

References in corpus (10)

• Direct Observation of Controlled Coupling in an Individual Quantum Dot Molecule
• Spin relaxation and decoherence of holes in quantum dots
• Observation of extremely slow hole spin relaxation in self-assembled quantum dots
• Electrically tunable g-factors in quantum dot molecular spin states
• Theory of fast optical spin rotation in a quantum dot based on geometric phases and trapped states
• Optically Probing Spin and Charge Interactions in an Tunable Artificial Molecule
• Spin state mixing in InAs double quantum dots
• Photoluminescence Spectroscopy of the Molecular Biexciton in Vertically Stacked Quantum Dot Pairs
• Optically induced spin gates in coupled quantum dots using the electron-hole exchange interaction
• Optical Spin Initialization and Non-Destructive Measurement in a Quantum Dot Molecule

Cited by in corpus (31)

• Optical control of one and two hole spins in interacting quantum dots
• Scalable qubit architecture based on holes in quantum dot molecules
• Electrically-tunable hole g-factor of an optically-active quantum dot for fast spin rotations
• Quantitative Excited State Spectroscopy of a Single InGaAs Quantum Dot Molecule through Multi-million Atom Electronic Structure Calculations
• Electron states in a double quantum dot with broken axial symmetry
• Coulomb mediated hybridization of excitons in artificial molecules
• Charged excitons and biexcitons in laterally coupled InGaAs quantum dots
• Phonon-assisted relaxation between hole states in quantum dot molecules
• Deterministic generation of entangled photonic cluster states from quantum dot molecules
• Spectroscopic signatures of many-body interactions and delocalized states in self-assembled lateral quantum dot molecules
• Exchange interaction and tunneling induced transparency in coupled quantum dots
• All-optical controlled phase gate in quantum dot molecules
• Exchange interaction of hole-spin qubits in double quantum dots in highly anisotropic semiconductors
• Optically controlled phase gate for two spin qubits in coupled quantum dots
• 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
• Emission spectrum of quasi-resonant laterally coupled quantum dots
• Design of a 4-electrode optical device for application of vector electric fields to self-assembled quantum dot complexes
• Tunneling-related electron spin relaxation in self-assembled quantum-dot molecules
• Single-particle and collective excitations in quantum wires made up of vertically stacked quantum dots: Zero magnetic field
• Coherent driving of direct and indirect excitons in a quantum dot molecule
• Incorporation of random alloy GaBi${}_x$As${}_{1-x}$ barriers in InAs quantum dot molecules (I): energy levels and confined hole states
• Spin-orbit coupling and spin relaxation of hole states in [001]- and [111]-orientedquantum dots of various geometry
• Spectral broadening of optical transitions at tunneling resonances in InAs/GaAs coupled quantum dot pairs
• Spin-orbit-induced hole spin relaxation in a quantum dot molecule: the effect of $s$-$p$ coupling
• The impact of hole $g$-factor anisotropy on spin-photon entanglement generation with InGaAs quantum dots
• Incorporation of random alloy GaBi${}_x$As${}_{1-x}$ barriers in InAs quantum dot molecules: alloy strain and orbital effects towards enhanced tunneling
• Charging of a Single InAs QD with Electrically-Injected Holes using a Lateral Electric Field
• A bandmixing treatment for multiband-coupled systems via nonlinear-eigenvalue scenario
• Trions Stimulate Electronic Coupling in Colloidal Quantum Dot Molecules
• Optical signatures of spin dependent coupling in semimagnetic quantum dot molecules