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Phononic Casimir Effect in Planar Materials
Pablo Rodriguez-Lopez1, Dai-Nam Le2, Lilia M Woods2
1Universidad Rey Juan Carlos, Área de Electromagnetismo and Grupo Interdisciplinar de Sistemas Complejos (GISC), 28933, Móstoles, Madrid, Spain.
Abstract:
The phononic Casimir effect between planar objects is investigated by deriving a formalism from the quantum partition function of the system following multiscattering approach. This fluctuation-induced coupling is mediated by phonons modeled as an effective elastic medium. We find that excitations with three types of polarizations arise from the resolved boundary conditions, however the coupling is dominated by only one of these degrees of freedom due to exponential suppression effects in the other two. The obtained scaling laws and dependence on materials properties and temperature suggest effective pathways of interaction control. Scenarios of materials combinations are envisioned where the phononic Casimir effect is of similar order as the standard Casimir interaction mediated by electromagnetic fluctuations.
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