Holographic phonons by gauge-axion coupling
arXiv:2105.07225 · doi:10.1007/JHEP07(2021)131
Abstract
In this paper, we show that a simple generalization of the holographic axion model can realize spontaneous breaking of translational symmetry by considering a special gauge-axion higher derivative term. The finite real part and imaginary part of the stress tensor imply that the dual boundary system is a viscoelastic solid. By calculating quasi-normal modes and making a comparison with predictions from the elasticity theory, we verify the existence of phonons and pseudo-phonons, where the latter is realized by introducing a weak explicit breaking of translational symmetry, in the transverse channel. Finally, we discuss how the phonon dynamics affects the charge transport.
v3: 29 pages, 11 figures, matching the version published in JHEP
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- Hydrodynamic modes in holographic multiple-axion model
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