Coulomb mediated hybridization of excitons in artificial molecules

Abstract

We report the Coulomb mediated hybridization of excitonic states in an optically active, artificial quantum dot molecule. By probing the optical response of the artificial molecule as a function of the static electric field applied along the molecular axis, we observe unexpected avoided level crossings that do not arise from the dominant single particle tunnel coupling. We identify a new few-particle coupling mechanism stemming from Coulomb interactions between different neutral exciton states. Such Coulomb resonances hybridize the exciton wave function over four different electron and hole single-particle orbitals. Comparisons of experimental observations with microscopic 8-band $k\cdot p$ calculations taking into account a realistic quantum dot geometry show good agreement and reveal that the Coulomb resonances arise from broken symmetry in the artificial molecule.

References in corpus (12)

• Demonstration of Entanglement of Electrostatically Coupled Singlet-Triplet Qubits
• Scalable quantum register based on coupled electron spins in a room temperature solid
• Direct Observation of Controlled Coupling in an Individual Quantum Dot Molecule
• Single-Photon Transistor Using a Förster Resonance
• Importance of second-order piezoelectric effects in zincblende semiconductors
• Coherent dipole-dipole coupling between two single atoms at a Förster resonance
• Spatially resolved observation of dipole-dipole interaction between Rydberg atoms
• Optically Probing Spin and Charge Interactions in an Tunable Artificial Molecule
• Macroscopic Polarization Rotation Induced by a Single Spin
• Recent advances in exciton based quantum information processing in quantum dot nanostructures
• Atomistic theory of dark excitons in self-assembled quantum dots of reduced symmetry
• Stark effect on the exciton spectra of vertically coupled quantum dots: horizontal field orientation and non-aligned dots

Cited by in corpus (13)

• Control of the orbital character of indirect excitons in MoS2/WS2 heterobilayers
• Coherent coupling of individual quantum dots measured with phase-referenced two-dimensional spectroscopy: photon echo versus double quantum coherence
• Spin-orbit coupling and magnetic field dependence of carriers states in a self-assembled quantum dot
• Bright electrically controllable quantum-dot-molecule devices fabricated by in-situ electron-beam lithography
• Excitonic complexes in MOCVD-grown InGaAs/GaAs quantum dots emitting at telecom wavelengths
• Limited accuracy of conduction band effective mass equations for semiconductor quantum dots
• Controlled Coherent Coupling in a Quantum Dot Molecule Revealed by Ultrafast Four-Wave Mixing Spectroscopy
• The importance of second order deformation potentials in modeling of InAs/GaAs nanostructures
• Laser from a Manybody Correlated Medium
• Polaron resonances in two vertically stacked quantum dots
• Spin-orbit coupling and spin relaxation of hole states in [001]- and [111]-orientedquantum dots of various geometry
• Entangled photons from composite cascade emitters
• Accuracy of effective mass equation for a single and double cylindrical quantum dot