Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 10: Quantum information systems

HL 10.1: Vortrag

Montag, 1. April 2019, 15:00–15:15, H36

Stimulated Microwave Emission from Opticaly Pumped Vacancy Defects in 4H Silicon Carbide for Maser Applications — •Andreas Gottscholl¹, Andreas Sperlich¹, Georgy V. Astakhov², Moritz Fischer¹, and Vladimir Dyakonov¹ — ¹Experimental Physics VI, Julius Maximilian University of Würzburg, 97074 Würzburg — ²Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden

Masers are already well known for decades, nevertheless their application as telecomunications amplifier is highly limited due to their operating conditions requiring vacuum techniques and cryogenic temperatures. Just recently a new generation of room-temperature masers was invented based on spin-properties of pentacene and diamond, respectively. In this study, we pave the way for a silicon carbide based maser to overcome the maser-threshold and which may potentially offer some advantages over the other approaches. In order to get a population inversion, we use opticaly pumped silicon vacancies and by applying an external magnetic field we tune the microwave transition into the range of 10 GHz [1]. Using magnetic resonance techniques, we characterize the system including population inversion, pumping efficiency and ultimately stimulated microwave emission [2]. In combination with a high-Q resonator (Q_L≈ 50000) our material is well on its way to become a suitable maser system with a wide-ranging applicability.
[1] Kraus et al., Nat. Phys. 10, 152 (2014)
[2] Fischer et al., Phys. Rev. Applied. 9, 054006 (2018)