3 years ago

Pinning of longitudinal phonons in holographic spontaneous helices.

Tomas Andrade, Matteo Baggioli, Napat Poovuttikul, Alexander Krikun

We consider the spontaneous breaking of translational symmetry and identify the associated Goldstone mode -- a longitudinal phonon -- in a holographic model with Bianchi VII helical symmetry. For the first time in holography, we observe the pinning of this mode after introducing a source for explicit breaking compatible with the helical symmetry of our setup. We study the dispersion relation of the resulting pseudo-Goldstone mode, uncovering how its speed and mass gap depend on the amplitude of the source and temperature. In addition, we extract the optical conductivity as a function of frequency, which reveals a metal-insulator transition as a consequence of the pinning.

Publisher URL: http://arxiv.org/abs/1708.08306

DOI: arXiv:1708.08306v3

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