Polar Metals

Quantum critical point of a polar (inversion breaking) transition
Polar fluctuations couple to interband transitions leading to strong coupling at band crossing

Phys. Rev. Lett. 124, 237601 (2020); preprint

Polar metals are intriguing materials where an inversion-symmetry breaking transition (structurally similar to a ferroelectric one) occurs in a conducting system. The polar order fluctuations being equivalent to a transverse optical phonon, it is yet an open question whether novel many-body phenomena may occur in such a system. I have recently shown, that a number of novel behaviors including non-Fermi liquid can be realized in multiband metals at a polar quantum critical point. Importantly, the resulting critical properties sensitively depend on the presence and type of band crossings in the electronic structure.

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