Electron Bunching in Stacks of Coupled Quantum Dots

Details Electron Bunching in Stacks of Coupled Quantum Dots Electron Bunching in Stacks of Coupled Quantum Dots

2007-06-20

arxiv.org/abs/0706.2950v3

Phys. Rev. B 77, 035409 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 5 figures. Published version

Scientific paper

10.1103/PhysRevB.77.035409

We study the transport properties of two double quantum dots in a parallel arrangement at temperatures of a few Kelvin. Thereby, we show that decoherence entailed by the substrate phonons affects the shot noise. For asymmetric coupling between the dots and the respective lead, the current noise is sub-Poissonian for resonant tunneling, but super-Poissonian in the vicinity of the resonances. Our results indicate that phonon emission and absorption is responsible for the shot noise enhancement. The observed asymmetry of the peaks at low temperatures stems from spontaneous emission.

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