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Q: Fachverband Quantenoptik und Photonik

Q 37: Precision Measurements and Metrology II

Q 37.1: Vortrag

Mittwoch, 13. März 2019, 14:00–14:15, S SR 111 Maschb.

Carrier Density Fluctuations as a source of noise in gravitational wave detectors — •Florian Feilong Bruns¹, Johannes Dickmann¹, Daniel Heinert², Ronny Nawrodt³, and Stefanie Kroker^{1, 4} — ¹Physikalisch-Technische Bundesanstalt Bundesallee 100, 38116 Braunschweig, Germany — ²Institut für Festkörperphysik, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany — ³5. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany — ⁴LENA Laboratory for Emerging Nanometrology, Technische Universität Braunschweig, Am langen Kamp 6 b, 380106 Braunschweig, Germany

The quantification and mitigation of noise is a critical task to push the sensitivity of gravitational wave detectors to the ultimate limit. In this contribution we theoretically investigate the noise induced by carrier density fluctuations in semiconductors. The Debye screening related to this type of fluctuations increases the correlation of the fluctuations and thus increases the noise amplitude at frequencies above 1 kHz. The first results on silicon and gallium arsenide as test mass materials indicate that the noise amplitude of carrier density noise is bigger than the SQL for frequencies larger than 10kHz.