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arXiv · 1807.10206

Plasmon-polaron of the topological metallic surface states

Alex Shvonski·Krzysztof Kempa
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Abstract

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.

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Alex Shvonski, Krzysztof Kempa. 2018-07-26. Plasmon-polaron of the topological metallic surface states. https://doi.org/10.1103/physrevb.99.125148

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