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arXiv · 2105.07225

Holographic phonons by gauge-axion coupling

Xi-Jing Wang·Wei-Jia Li
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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.

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Xi-Jing Wang, Wei-Jia Li. 2021-05-15. Holographic phonons by gauge-axion coupling. https://doi.org/10.1007/jhep07(2021)131

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