Berlin 2018 – scientific programme
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DS: Fachverband Dünne Schichten
DS 27: New Twists for Nanoquakes on a Chip - Emerging Applications of Surface Acoustic Waves in Condensed Matter Physics (Focussed Session): Session I
DS 27.8: Talk
Thursday, March 15, 2018, 12:30–12:45, H 2032
SAW Transducers with Gouy Phase Adjustments for Minimal Beam Waist — •Madeleine Msall1,2 and Paulo Santos2 — 1Bowdoin College, Brunswick, USA — 2Paul-Drude-Institut für Festkörperelektronik, Berlin, DE
High frequency surface acoustic waves can effectively probe and control low-dimensional electron systems. SAW provide localized control of band structure through dynamic strain coupling that can be exploited for switching applications or to drive transport. Applications that rely upon SAW coupling to quasi 0-D systems (e.g., quantum dots) require highly tuned SAW cavities with near-field focusing transducers. IDTs are formed by electrode fingers placed on lines of equal phase, requiring pattern correction for both material anisotropy and the expected Guoy phase shift for a Gaussian beam. [1] Our models show that appropriate pattern adjustments can provide significant enhancement of local strain in sub-wavelength focal spots without frequency broadening. These model improvements inspire new strategies for creating high-Q cavities with optimized coupling between phonons and qubits.
[1] Holme, et al. 2003 DOI.org/10.1063/1.1590405