Berlin 2015 – wissenschaftliches Programm

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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

Dienstag, 17. März 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 Dyakonov^1,2 — 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)