Journal
PHYSICAL REVIEW LETTERS
Volume 108, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.108.197402
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Funding
- DFG [SFB-631]
- Nanosystems Initiative Munich
- Emmy Noether Program
- EU via SOLID
- TUM Graduate School
- TUM Institute for Advanced Study
- CNPq
- FAPEMIG
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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 photogenerated 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) interdot tunneling is shown to occur over a surprisingly wide bandwidth, up to similar to 8 meV, reflecting the spectrum of exciton-acoustic phonon coupling in the system.
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