Regensburg 2007 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 8: Superconductivity - Poster Session

TT 8.42: Poster

Montag, 26. März 2007, 14:00–17:45, Poster A

Numerical simulation of an oscillator driven by a superconducting single electron transistor — •Michael Marthaler and Gerd Schön — Institut für Theoretische Festkörperphysik, Universität Karlsruhe, D-76128 Karlsruhe, Germany

We study a quantum oscillator, capacitively coupled to a superconducting single electron transistor (SSET). Transitions between charge states on the island lead to excitations in the oscillator. Our analysis focuses on the behavior of the oscillator in the vicinity of the JQP resonance. Using a dressed state approach we can calculate the probability distribution of the oscillator states. As proposed by NEC-Group (Astafiev et. al) one should get a laser-like behavior if the oscillator is at resonance with the Josephson oscillations in the SSET. We were able to verify this.