Spontaneous Emission Spectrum in Double Quantum Dot Devices

Details Spontaneous Emission Spectrum in Double Quantum Dot Devices Spontaneous Emission Spectrum in Double Quantum Dot Devices

1998-08-10

arxiv.org/abs/cond-mat/9808092v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 3 figures

Scientific paper

10.1126/science.282.5390.932

A double quantum dot device is a tunable two-level system for electronic energy states. A dc electron current directly measures the rates for elastic and inelastic transitions between the two levels. For inelastic transitions energy is exchanged with bosonic degrees of freedom in the environment. The inelastic transition rates are well described by the Einstein coefficients, relating absorption with stimulated and spontaneous emission. The most effectively coupled bosons in the specific environment of our semiconductor device are acoustic phonons. The experiments demonstrate the importance of vacuum fluctuations in the environment for little circuits of coherent quantum devices.

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