We report a plasmon-polaron mode of a 2D electron gas occupying surface states of a 3D topological crystal. This new, low-frequency, acoustic plasmon mode splits-off from the conventional spin-plasmon mode as a result of strong interactions of the surface electrons with bulk phonons. We show that, like in the case of the conventional spin-plasmon, the scattering of this mode is strongly suppressed in some regions of the phase space. This signature of the topological protection leads to an Umklapp-free mode dispersion at the Brillouin zone boundary. Such a plasmon polaron mode has indeed been recently observed in the topological metal Be2Se3.
@article{arxiv.1807.10206,
title = {Plasmon-polaron of the topological metallic surface states},
author = {Alex Shvonski and Krzysztof Kempa},
journal= {arXiv preprint arXiv:1807.10206},
year = {2019}
}