Berlin 2018 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 50: HL Poster IV

HL 50.34: Poster

Thursday, March 15, 2018, 19:00–21:00, Poster B

Stimulated Microwave Emission from Vacancy Defects in 4H Silicon Carbide for Maser Applications — •Andreas Gottscholl¹, Georgy V. Astakhov¹, Andreas Sperlich¹, and Vladimir Dyakonov^1,2 — ¹Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — ²Bavarian Center for Applied Energy Research (ZAE Bayern), 97074 Würzburg

It is hard to imagine everyday life without lasers and their applications. Nevertheless the maser, which operates with electromagnetic waves in a lower energy regime, is only finding its use in some niche applications such as microwave amplification for radio astronomy or satellites. One main reason are the operating conditions, requiring cryogenic temperatures and vacuum techniques. Here, we investigate a concept for microwave emission which is promising masing even at room-temperature based on vacancy defects in 4H silicon carbide [1]. These spin defects form a quadruplet ground-state which can be spin-polarized by near infrared light. By applying an external magnetic field we tune the microwave transition into the range of 10GHz and by means of high optical pumping a population inversion can by far exceed the Boltzmann equilibrium at room-temperature.

[1] Kraus et al., Nat. Phys. 10, 152 (2014)