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10 papers · 2 filters
Full Counting Statistics of Multiple Andreev Reflections in incoherent diffusive superconducting junctions
P. Samuelsson
We present a theory for the full distribution of current fluctuations in incoherent diffusive superconducting junctions, subjected to a voltage bias. This theory of full counting s…
Temperature dependence of the gain profile for THz quantum cascade lasers
Rikard Nelander, Andreas Wacker
We study the rapid decrease of peak gain in resonant-phonon THz Quantum Cascade Lasers with increasing temperature. The effect of various microscopic scattering processes on the ga…
Fingerprints of spatial charge transfer in Quantum Cascade Lasers
R. Nelander, A. Wacker, M. F. Pereira +7
We show that mid infrared transmission spectroscopy of a quantum cascade laser provides clear cut information on changes in charge location at different bias. Theoretical simulatio…
Quantized dynamics of a coherent capacitor
M. Moskalets, P. Samuelsson, M. Buttiker
A quantum coherent capacitor subject to large amplitude pulse cycles can be made to emit or reabsorb an electron in each half cycle. Quantized currents with pulse cycles in the GHz…
Coherence and Spatial Resolution of Transport in Quantum Cascade Lasers
Andreas Wacker
The method of nonequilibrium Greens functions allows for a spatial and energetical resolution of the electron current in Quantum Cascade Lasers. While scattering does not change th…
Manipulating the rotational properties of a two-component Bose gas
J. Christensson, S. Bargi, K. Karkkainen +4
A rotating, two-component Bose-Einstein condensate is shown to exhibit vortices of multiple quantization, which are possible due to the interatomic interactions between the two spe…