Electrical control of inter-dot electron tunneling in a quantum dot molecule

Abstract

We employ ultrafast pump-probe spectroscopy to directly monitor electron tunneling between discrete orbital states in a pair of spatially separated quantum dots. Immediately after excitation, several peaks are observed in the pump-probe spectrum due to Coulomb interactions between the photo-generated charge carriers. By tuning the relative energy of the orbital states in the two dots and monitoring the temporal evolution of the pump-probe spectra the electron and hole tunneling times are separately measured and resonant tunneling between the two dots is shown to be mediated both by elastic and inelastic processes. Ultrafast (< 5 ps) inter-dot tunneling is shown to occur over a surprisingly wide bandwidth, up to ~8 meV, reflecting the spectrum of exciton-acoustic phonon coupling in the system.

References in corpus (5)

• Direct Observation of Controlled Coupling in an Individual Quantum Dot Molecule
• Fast optical preparation, control and read-out of single quantum dot spin
• Optically Probing Spin and Charge Interactions in an Tunable Artificial Molecule
• Two qubit conditional quantum logic operation in a single self-assembled quantum dot
• Phonon-assisted relaxation and tunneling in self-assembled quantum dot molecules

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