Phonon-Josephson resonances in atomtronic circuits
Y.M. Bidasyuk, O.O.Prikhodko, M. Weyrauch
TL;DR
This paper investigates how Josephson oscillations in Bose-Einstein condensates can resonantly excite phonon modes, revealing new tunneling phenomena and potential applications in spectroscopic analysis of collective excitations.
Contribution
It introduces a study of phonon-Josephson resonances in atomtronic circuits using simulations, highlighting their effects and experimental implications.
Findings
Resonant phonon excitation induces additional tunneling currents.
The effect can be used for spectroscopy of low-energy excitations.
Resonances may interfere with observing Shapiro effects.
Abstract
We study the resonant excitation of sound modes from Josephson oscillations in Bose-Einstein condensates. From the simulations for various setups using the Gross-Pitaevskii mean-field equations and Josephson equations we observe additional tunneling currents induced by resonant phonons. The proposed experiment may be used for spectroscopy of phonons as well as other low-energy collective excitations in Bose-Einstein condensates. We also argue that the observed effect may mask the observation of Shapiro resonances if not carefully controlled.
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