Berlin 2015 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 39: Posters II (Topological insulators; Graphene; Spintronics and spin physics; Quantum information science)
HL 39.37: Poster
Tuesday, March 17, 2015, 14:00–20:00, Poster F
Microstrip resonators for silicon-carbide quantum microwave emitters — •Johannes Fichtner1, Andreas Sperlich1, Hannes Kraus1, Georgy Astakhov1, and Vladimir Dyakonov1,2 — 1Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — 2ZAE Bayern, 97074 Würzburg
Silicon vacancies in silicon carbide (SiC) were recently found to possess an unique excitation pathway. Optical pumping results in deactivation into a metastable state, which then selectively populates the higher energy ± 3/2 manifold of the spin quartet ground state. This population inversion allows stimulated emission of radiation [1].
When placed in a resonator, microwave amplification in SiC vacancies is possible. The amplification (gain) is highly dependent on the filling factor of the resonator. Our approach to increase the gain is the use of microstrip resonators instead of usual box resonators. A microstrip is an electrical transmission line consisting of a conduction strip separated from a conducting ground plane by a dielectric.
Here we present the first results on our circuit board design and its performance. The most important properties of the microstrip waveguide are its characteristic impedance and resonance frequency. The influence of the resonator geometry were studied. Effects of different edge shapes (so called mitred bends) and feed line gaps were also examined.
[1] H. Kraus, V. Soltamov, D. Riedel, S. Väth, F. Fuchs, A. Sperlich, P. Baranov, V. Dyakonov and G. Astakhov, Nat. Phys. 10, 157 (2014)