Regensburg 2025 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 11: Superconductivity: Poster
TT 11.57: Poster
Monday, March 17, 2025, 15:00–18:00, P4
Analysis of the Mechanical Properties of Nanomechanical String Resonators based on NbTiN — •Burak Bülbüloğlu1,2, Korbinian Rubenbauer1,2, Thomas Luschmann1,2,3, Rudolf Gross1,2,3, and Hans Huebl1,2,3 — 1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Garching, Germany — 2School of Natural Sciences, Technical University of Munich, Garching, Germany — 3Munich Center for Quantum Science and Technology, Munich, Germany
Opto- and electromechanical systems play an intricate part in the fields of quantum sensing and transduction. Aluminum (Al) is a popular material platform in the field of cavity-optomechanics due to its low internal loss rates at microwave frequencies and self-limiting oxide. However, the operation of Al is limited by its critical temperature (Tc ≈ 1.2 K in the bulk). We explore Niobium Titanium Nitride (NbTiN) as an alternative candidate for opto- and electromechanical systems based on thin film technology. NbTiN has a Tc of up to 17 K in bulk and can be used as a material for planar superconducting microwave quantum circuits. Moreover, it has a higher critical current density compared to Al and, thus, can support a larger photon number or microwave drive power. Here, we present doubly-clamped NbTiN nanomechanical string resonators and investigate their mechanical properties. We find stress levels on par with annealed Al, positioning NbTiN strings as a promising platform for the implementation of nano-electromechanical circuits operating at elevated temperatures.
Keywords: Nanomechanics; Opto- and nanoelectromechanics; Nanoelectromechanics