Regensburg 2022 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 35: Acoustic Waves and Nanomechanics

HL 35.3: Talk

Thursday, September 8, 2022, 15:30–15:45, H34

Radio Frequency Surface Acoustic Wave Cavities near 6 GHz — •Nazim Ashurbekov¹, Michael Hanke¹, Edoardo Zatterin², Madeleine Msall³, Jan Hellemann¹, Paulo Santos¹, Tobias Schulli², and Stefan Ludwig¹ — ¹Paul-Drude-Institut, Berlin, Germany — ²European Synchrotron, Grenoble, France — ³Bowdoin College, Maine, USA

Aiming at strong coupling between confined phonons and confined electrons in hybrid quantum circuits, we develop radio frequency (rf) surface-phonon cavities. The cavities are defined by focusing surface gate Bragg mirrors. They also serve as interdigital transducers, which we use to generate standing surface acoustic waves (SSAWs) for characterizing the cavities. At frequencies >3 GHz corresponding to wavelengths <1 μm most methods to measure the SSAWs become increasingly difficult.

Here, we explore two experimental methods with superior resolutions, scanning X-ray diffraction microscopy (SXDM) and atomic force microscopy (AFM). We present AFM measurements of focused rf SSAWs near 6 GHz and compare them with SXDM measurements. While AFM provides a basic characterization of the SSAW, SXDM in addition yields its complete 3D strain field, relevant for the electron-phonon coupling.

Finally, comparing our experimental results with finite elements method simulations allows us to explore design variations for future optimizations of the electron-phonon coupling in quantum devices.