Optically Probing Spin and Charge Interactions in an Tunable Artificial Molecule

Abstract

We optically probe and electrically control a single artificial molecule containing a well defined number of electrons. Charge and spin dependent inter-dot quantum couplings are probed optically by adding a single electron-hole pair and detecting the emission from negatively charged exciton states. Coulomb and Pauli blockade effects are directly observed and hybridization and electrostatic charging energies are independently measured. The inter-dot quantum coupling is confirmed to be mediated predominantly by electron tunneling. Our results are in excellent accord with calculations that provide a complete picture of negative excitons and few electron states in quantum dot molecules.

shortened version: 6 pages, 3 figures, 1 table, to appear in Phys. Rev. Lett

References in corpus (3)

• Single-shot read-out of an individual electron spin in a quantum dot
• Direct Observation of Controlled Coupling in an Individual Quantum Dot Molecule
• Recent advances in exciton based quantum information processing in quantum dot nanostructures

Cited by in corpus (10)

• Electrically tunable g-factors in quantum dot molecular spin states
• Photoluminescence Spectroscopy of the Molecular Biexciton in Vertically Stacked Quantum Dot Pairs
• Direct observation of acoustic phonon mediated relaxation between coupled exciton states in a single quantum dot molecule
• Stark effect on the exciton spectra of vertically coupled quantum dots: horizontal field orientation and non-aligned dots
• Measurement, control, and decay of quantum-dot spins
• Strong Electron-Hole Exchange in Coherently Coupled Quantum Dots
• Exciton spectra in vertical stacks of triple and quadruple quantum dots in an electric field
• Growth and optical properties of self-assembled InGaAs Quantum Posts
• Spin-Photon Entangling Diode
• Optical Spin Initialization and Non-Destructive Measurement in a Quantum Dot Molecule